Drought Plan Option Name: Drought Publicity Campaigns

Part 1 of 2

Drought Plan Option Name: Drought publicity campaigns

Drought Plan Option Description: Campaigns to raise public awareness can be carried out in a number of ways using a variety of different types of media. The central message is to urge all customers to conserve water, especially during periods of drought. This message must be underpinned by explanations of the background to the prevailing conditions and how the drought might continue to intensify. In addition, the Company may promote enhanced uptake of its water efficiency programmes.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Potential residual effect on sensitive Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ receptors (assuming good practice significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) construction methods) Commentary after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The campaigns to raise public awareness can be fauna designated sites of nature conservation interest and carried out in a number of ways using a variety of protected habitats and species (with particular regard to different types of media. This measure will have no avoiding the effects of over-abstraction on sensitive sites, adverse impacts on biodiversity, flora or fauna, or habitats and species and consideration of adaptability to designated sites of nature conservation interest. climate change) and to protect and enhance natural capital However the measure will reduce consumer and the biodiversity and ecosystem services that Moderate Medium Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial contribute to the economy. demand for water and thereby reduce the requirement for abstraction from Yorkshire Water’s sources, with the potential for positive impacts on flow sensitive habitats/species.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. n/a n/a n/a n/a n/a n/a Media campaigns are considered to have no impact on avoiding the introduction or spreading of INNS. fauna None None

Population and human 2.1 To protect and improve health and well-being and Medium High Short-term Temporary Low (beneficial) Medium (beneficial) The media campaign will result in water savings health reducTo protect and improve health and well-being which will contribute towards improving the (including promoting the value of the water environment security of supply for customers in Yorkshire for health and wellbeing). Water’s supply region. The media campaign will also None Minor beneficial help raise awareness of the importance and value of water environment for health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and n/a n/a n/a n/a n/a n/a No impacts on recreation, tourism or navigation are informal recreation. anticipated as a result of the media campaign. health None None

Population and human 2.3 To promote a sustainable economy and thriving Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) The media campaign will result in water savings health communities with good access to the services they need. which will contribute towards improving the security of water supply for businesses in the None Minor beneficial region, therefore protecting the local economy.

Material assets and 3.1 To reduce, and make more efficient, the domestic, Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) The media campaign will not involve any increased resource use industrial and commercial consumption of resources, material resource use. This measure will reduce the minimise the generation of waste, encourage its re-use and amount of water used in the region. It will not None Minor beneficial eliminate waste sent to landfill. involve any increased waste production.

Water 4.1 To maintain or improve the quality of rivers, lakes, Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) The media campaign is considered to have a groundwater, estuarine and coastal waterbodies. beneficial impact on the water environment, acknowledging that reduced consumer demand for water will result in reduced requirement for None Minor beneficial abstraction from water sources in the Yorkshire Water operating area.

Water 4.2 To avoid adverse impact on surface and groundwater Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) Reductions in demand for water due to this drought levels and flows, including when this impacts on habitats plan measure would result in reduced requirement and/or navigation. for abstraction from Yorkshire Water’s sources, reducing associated abstraction impacts on surface None Minor beneficial water and groundwater quality in drought conditions.

Water 4.3 To ensure appropriate and sustainable management of Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) The media campaign is considered to have abstractions (or compensation flow) to maintain water beneficial impacts on water abstraction supplies whilst protecting ecosystem functions that rely on management, acknowledging that reduced water resources. consumer demand for water will result in reduced None Minor beneficial requirement for abstraction at Yorkshire Water’s sources. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.4 To promote water efficiency and measures that enable Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) The drought publicity are considered to have sustainable water use. beneficial impact on water via reduced consumer demand for water. This may have long term impacts on consumer behaviours and water usage through None Minor beneficial information provision and providing information to the public regrading water efficiency methods.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of n/a n/a n/a n/a n/a n/a No impacts on geology, geomorphology and soils and to protect and enhance geodiversity. quality/quantity of soils are anticipated as a result of the media campaign. None None

Air and Climate 6.1 To maintain and improve air quality. n/a n/a n/a n/a n/a n/a No impacts on air quality are anticipated as a result of the media campaign. None None

Air and climate 6.2 To reduce greenhouse gas emissions. n/a n/a n/a n/a n/a n/a The media campaign will not involve an increase in energy consumption or associated greenhouse gas None None emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Small High Short-term Temporary Low (beneficial) High (beneficial) Demand management measures are a key change. component of Yorkshire Water’s Drought Plan. The Plan aims to ensure the resilience of water supplies None Minor beneficial to drought which may become more prevalent due to climate change. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Medium Medium Short-term Temporary Low (beneficial) Low (beneficial) The media campaign is considered to have no direct Heritage heritage assets and their settings and protect impact on the historic environment, heritage assets archaeologically important sites. and their settings and archaeologically important sites. There is the potential for reduced consumer demand for water to result in reduced requirement None Negligible beneficial for abstraction at Yorkshire Water’s sources, potentially reducing any impacts of drought-related effects on archaeology and cultural heritage assets.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access Medium Medium Short-term Temporary Low (beneficial) Low (beneficial) The media campaign is considered to have no direct Amenity to designated and undesignated landscapes, townscapes impact on landscape and visual amenity or any and the countryside. changes to access to the countryside or open space. There is the potential for reduced consumer demand for water to result in reduced requirement None Negligible beneficial for abstraction at Yorkshire Water’s sources, potentially reducing any impacts of drought-related landscape or visual impacts. Part 1 of 2

Drought Plan Option Name: Increased leakage detection and repair activity

Drought Plan Option Description: This drought option involves a range of leakage reduction activities through find and fix approaches. The potential savings that could be achieved through this option are uncertain.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including fauna designated sites of nature conservation interest and Construction activities associated with leakage protected habitats and species (with particular regard to detection and repair activities may result in avoiding the effects of over-abstraction on sensitive sites, disturbance to local habitats and species during the habitats and species and consideration of adaptability to works. The majority of works are anticipated to be climate change) and to protect and enhance natural capital in an urban setting. Assuming best practice and the biodiversity and ecosystem services that Low (adverse) Low (adverse) Medium (beneficial) High Long-term Permanent construction methods, impacts of the construction Negligible adverse Minor beneficial contribute to the economy. Low (beneficial) Medium (beneficial) phase are anticipated to be negligible. The reduction in water lost through leakage will result in reduced requirement for abstraction at source and therefore, potential for positive impacts on flow and sensitive habitats/species.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Leakage detection and repair activities will not fauna N/A N/A N/A N/A N/A N/A None None affect the spread of INNS.

Population and human 2.1 To protect and improve health and well-being and The drought option will help to ensure levels of reducTo protect and improve health and well-being Permanent health Medium (beneficial) High (beneficial) service are maintained through enabling provision (including promoting the value of the water environment Medium Long-term (beneficial) (beneficial) Low (beneficial) None Moderate beneficial for health and wellbeing). Small (adverse) of water that would have otherwise been lost to leakage. Population and human 2.2 To protect and enhance opportunities for formal and health informal recreation. Construction activities associated with leakage detection and repair activities may result in nuisance effects associated with traffic and noise. However, these will be short term at any one Small (adverse) Low Short-term (adverse) Temporary (adverse) Low (adverse) Low (adverse) location (likely to be urban) and assuming best Negligible adverse None practice construction methods, effects will be minimal. It is assumed that public rights of way will be maintained during repair activities and there will be no effects on recreational opportunity.

Population and human 2.3 To promote a sustainable economy and thriving health communities with good access to the services they need. Permanent Option will contribute to the maintenance of supply Medium (beneficial) Long-term (beneficial) High (beneficial) Low (beneficial) Low (beneficial) reliability in drought conditions, ensuring a resilient None Moderate beneficial supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, Increased leakage reduction activity through ‘fix and resource use industrial and commercial consumption of resources, minimise the generation of waste, encourage its re-use and find’ approaches will result in the reduction of eliminate waste sent to landfill. water lost in the supply network and therefore the Small (beneficial) Low (beneficial) Low (beneficial) High Long-term Permanent energy and chemicals used to treat it. It utilises Negligible adverse Negligible beneficial Small (adverse) Low (adverse) Low (adverse) existing infrastructure. Repairs may require raw materials. It has been assumed that any materials required would be obtained locally.

Material assets and 3.2 To promote efficient water resource management and resource use the sustainable management of natural resources, No opportunities to promote the sustainable ensuring water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A management of natural resources have been None None maintained. identified for this option.

Water 4.1 To maintain or improve the quality of rivers, lakes, groundwater, estuarine and coastal waterbodies. The drought option will not directly result in, or modify any abstraction (surface water or Permanent Long-term (beneficial) groundwater) and therefore will not effect surface Medium (beneficial) Moderate (beneficial) Low (beneficial) Medium (beneficial) None Minor beneficial water or groundwater levels. However, the reduction in water lost through leakage will result in reduced requirement for abstraction at source. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater levels and flows, including when this impacts on habitats Construction activities associated with leakage and/or navigation. detection and repair activities may result in the potential for impacting on local surface and groundwater quality. Assuming best practice Medium (beneficial) Permanent Low (beneficial) Low (beneficial) construction methods, impacts of the construction Moderate Long-term (beneficial) Negligible adverse Negligible beneficial Small (adverse) (beneficial) Low (adverse) Low (adverse) phase are anticipated to be negligible. The Short-term (adverse) Temporary (adverse) reduction in water lost through leakage will result in reduced requirement for abstraction at source, and therefore also mitigate any surface water quality effects associated with abstraction.

Water 4.3 To ensure appropriate and sustainable management of Permanent The option will contribute to more sustainable abstractions (or compensation flow) to maintain water Long-term (beneficial) supplies whilst protecting ecosystem functions that rely on Medium (beneficial) High (beneficial) Low (beneficial) Medium (beneficial) abstractions by reducing the amount of water None Minor beneficial water resources. already abstracted that is lost through leakage.

4.4 To promote water efficiency and measures that enable Water No opportunities to promote long-term sustainable water use. N/A N/A N/A N/A N/A N/A improvement in water efficiency have been None None identified for this option. Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils and to protect and enhance geodiversity. Construction activities associated with Increased leakage reduction activity and ‘fix and find’ Small (adverse) High Short-term (adverse) Temporary (adverse) Low (adverse) Low (adverse) approaches may result in localised disturbance to Negligible adverse None geology and land use. However, repair activity will be on pipelines which are already in situ.

Air and Climate 6.1 To maintain and improve air quality. Vehicle trips necessary for leakage detection and repair will cause emissions affecting air quality, Small (adverse) Low Short-term (adverse) Temporary (adverse) Low (adverse) High (adverse) Minor adverse None including some within Air Quality Management Areas in Yorkshire Water's supply area.

Air and climate 6.2 To reduce greenhouse gas emissions. Vehicle trips necessary for leakage detection and repair will cause emissions of greenhouse gas emissions. Leakage detection and repairs will result Temporary (adverse) Short-term (adverse) Low (beneficial) Medium (beneficial) in the reduction of water lost in the supply network Medium Moderate Permanent Minor adverse Minor beneficial Long-term (beneficial) Low (adverse) Medium (adverse) and long term energy savings associated with this (beneficial) reduction (decreased greenhouse gas emissions associated with decreased need for water treatment and pumping).

6.3 To consider the need for adaptive measures for climate Air and climate Demand management measures are a key change. Permanent component of Yorkshire Water's Drought Plan. The Small (beneficial) Long-term (beneficial) High (beneficial) Low (beneficial) High (beneficial) Plan aims to ensure resilience of water supplies to None Minor beneficial drought which may become more prevalent due to climate change. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Increased leakage reduction activity through ‘fix and Heritage heritage assets and their settings and protect archaeologically important sites. find’ approaches will be on pipelines which are already in situ, and as such, it is not anticipated that any sites of archaeological or cultural heritage Small (adverse) Moderate Short-term (adverse) Temporary Low (adverse) Low (adverse) importance will be affected. The setting of any Negligible adverse None surrounding heritage assets may be impacted for the short term, however, considering the option is an acceleration of ongoing leakage reduction activity this is considered negligible.

8.1 To protect, enhance the quality of and improve access Landscape and Visual The majority of works are anticipated to be in an to designated and undesignated landscapes, townscapes Amenity urban setting. Assuming best practice construction and the countryside. methods, impacts of the construction phase are Small (adverse) Moderate Short-term (adverse) Temporary Low (adverse) Low (adverse) Negligible adverse None anticipated to be negligible. The scheme will have no direct effect on landscape and visual amenity in operation. Part 1 of 2

Drought Plan Option Name: Introduction of temporary use ban

Drought Plan Option Description: This measure involves the temporary ban on water use to reduce demand. It could be introduced relatively quickly and in phased manner under new powers created by the FWMA 2010 can be applied on a WRZ basis.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including A temporary use ban is considered to have no fauna designated sites of nature conservation interest and impact on biodiversity, flora and fauna, other than protected habitats and species (with particular regard to to acknowledge that reduced consumer demand for avoiding the effects of over-abstraction on sensitive sites, water will result in a reduced requirement for habitats and species and consideration of adaptability to Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) abstraction at Yorkshire Water’s sources and, None Minor beneficial climate change) and to protect and enhance natural capital therefore, there is the potential for positive impacts and the biodiversity and ecosystem services that contribute to the economy. on flow, sensitive habitats/species etc.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. fauna The temporary use ban is likely to have no impact on avoiding the introduction or spreading of INNS, n/a n/a n/a n/a n/a n/a None None with reduced abstraction requirements leaving more water in river systems.

2.1 To protect and improve health and well-being and Population and human A temporary use ban will provide water savings will health reducTo protect and improve health and well-being (including promoting the value of the water environment contribute towards improving security of supply of for health and wellbeing). water in the Yorkshire Water supply region. Drinking water quality will not be affected by the Medium High Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial restrictions and the measures do not restrict essential water uses that are important in maintaining health and well-being of the population served by Yorkshire Water. Population and human 2.2 To protect and enhance opportunities for formal and health informal recreation. Reducing the demand for non-essential water use is unlikely to have any impacts for recreation, tourism Small Low Short Temporary Medium (adverse) Low (adverse) and navigation. There may be some limited Minor adverse None domestic impact, for example not being able to refill or maintain a domestic swimming pool.

Population and human 2.3 To promote a sustainable economy and thriving The principal impact will be on domestic customers communities with good access to the services they need. health as the ban would preclude the use of water for those use categories set out under the temporary Medium Moderate Short to medium-term Temporary Medium (adverse) Medium (adverse) use ban powers. The ban may indirectly adversely Moderate adverse None impact business which benefit from the sale of certain water-using appliances such as hosepipes and sprinklers. Material assets and 3.1 To reduce, and make more efficient, the domestic, industrial and commercial consumption of resources, The ban will reduce the demand for water in the resource use region, improving the efficiency of existing water minimise the generation of waste, encourage its re-use and Medium Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial eliminate waste sent to landfill. resource use. It will not result in any increase in the generation of waste.

3.2 To promote efficient water resource management and Material assets and No opportunities to promote the sustainable resource use the sustainable management of natural resources, ensuring water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A management of natural resources have been None None maintained. identified for this option. 4.1 To maintain or improve the quality of rivers, lakes, Water Reductions in demand for water would result in groundwater, estuarine and coastal waterbodies. reduced requirement for abstraction at source, Low Low Short-term Temporary Low (beneficial) Medium (beneficial) reducing the risk of associated impacts on surface None Minor beneficial water and groundwater quality in drought conditions. Water 4.2 To avoid adverse impact on surface and groundwater levels and flows, including when this impacts on habitats The ban will not directly result in, or modify any and/or navigation. abstraction (surface water or groundwater). Reduction in demand for demand for water will Medium Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial result in reduced requirement for abstraction from Yorkshire Water’s sources, reducing the impacts on water levels and river flows in drought conditions.

Water 4.3 To ensure appropriate and sustainable management of abstractions (or compensation flow) to maintain water Reduction in demand for water will result in a supplies whilst protecting ecosystem functions that rely on reduced requirement for abstraction from Yorkshire Medium Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources. Water’s sources, helping provide some protection for water-dependent ecosystems. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.4 To promote water efficiency and measures that enable sustainable water use. This option will have a beneficial impact on water, acknowledging that reduced consumer demand for Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) water will result in reduced requirement for None Minor beneficial abstraction at source. This may have medium to long-term impacts on consumer water usage.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of No impacts on geology, geomorphology and soils and to protect and enhance geodiversity. n/a n/a n/a n/a n/a n/a quality/quantity of soils are anticipated as a result None None of the temporary use ban. Air and Climate 6.1 To maintain and improve air quality. No impacts on air quality are anticipated as a result n/a n/a n/a n/a n/a n/a None None of the temporary use ban.

Air and climate 6.2 To reduce greenhouse gas emissions. The ban will not involve an increase in energy n/a n/a n/a n/a n/a n/a consumption or associated greenhouse gas None None emissions. Air and climate 6.3 To consider the need for adaptive measures for climate Demand management measures are a key change. component of Yorkshire Water’s Drought Plan. The Small High Long-term Permanent Low (beneficial) Medium (beneficial) Plan aims to ensure resilience of water supplies to None Minor beneficial drought which may become more prevalent due to climate change. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There may be minor adverse impacts associated heritage assets and their settings and protect Heritage with the setting of some heritage assets, for archaeologically important sites. example, visual impacts on registered parks and gardens and /or the grounds of listed buildings due to restrictions on the use of water for any non- essential purposes. Notwithstanding these impacts, the ban is considered unlikely to have any direct Low (beneficial) Low (beneficial) Medium Moderate Medium-term Temporary impact on the historic environment, heritage assets Negligible adverse Negligible beneficial Low (adverse) Low (adverse) and archaeologically important sites. There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction at Yorkshire Water’s sources, potentially reducing the magnitude of any drought- related effects on archaeology and cultural heritage assets. Landscape and Visual 8.1 To protect, enhance the quality of and improve access There may be some localised adverse effects on Amenity to designated and undesignated landscapes, townscapes townscapes and the setting of some visual and the countryside. amenities due to the ban on watering of gardens and grounds. However, the ban is considered to have no direct impact on landscape and visual Low (beneficial) Low (beneficial) amenity or any changes to access to the Medium Moderate Medium-term Temporary Negligible adverse Negligible beneficial Low (adverse) Low (adverse) countryside or open space. There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction from Yorkshire Water’s sources, potentially reducing the magnitude of any drought-related effects on landscape or visual amenity. Part 1 of 2

Drought Plan Option Name: Introduction of a drought order to ban non-essential water uses

Drought Plan Option Description: The Company has recourse to a range of restrictions to Non-Essential Use. However, it can take a significant time to apply for and then implement a Drought Order. The Company might decide not to exercise all its powers until severe drought conditions are reached.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including fauna designated sites of nature conservation interest and The ban is considered to have no impact on protected habitats and species (with particular regard to biodiversity, flora and fauna, other than to avoiding the effects of over-abstraction on sensitive sites, acknowledge that reduced consumer demand for habitats and species and consideration of adaptability to Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) water will result in reduced requirement for None Minor beneficial climate change) and to protect and enhance natural capital abstraction from Yorkshire Water’s sources and, and the biodiversity and ecosystem services that therefore, potential for positive impacts on flow, contribute to the economy. sensitive habitats/species etc.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. The ban is likely to have no impact on avoiding the fauna introduction or spreading of INNS, with reduced n/a n/a n/a n/a n/a n/a None None abstraction requirements leaving more water in river systems.

Population and human 2.1 To protect and improve health and well-being. To The ban will provide water savings which will protect and improve health and well-being (including health contribute towards improving security of supply of promoting the value of the water environment for health water in the Yorkshire Water supply region. and wellbeing). Drinking water quality will not be affected by the Medium Medium Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial restrictions and there will be no impact on essential water uses that are necessary to maintain public health and well-being of the population served by Yorkshire Water. Population and human 2.2 To protect and enhance opportunities for formal and informal recreation. There may be potential for moderate impacts upon health recreational activities due to restrictions on filling of swimming pools, watering of sports pitches, etc. Medium Low Short-term Temporary Medium (adverse) Medium (adverse) There may be moderate impacts associated with Moderate adverse None the setting of tourist attractions, for example water features and parks/gardens associated with popular tourist sites. Population and human 2.3 To promote a sustainable economy and thriving health communities with good access to the services they need. The ban carries the risk of some economic impact on businesses that benefit directly or indirectly from certain water uses that would be prohibited under Medium Medium Short-term Temporary High (adverse) Medium (adverse) Major adverse None the ban (e.g. sports and leisure facilities). The ban may result in some business loss if the water- related operations have to be suspended.

Material assets and 3.1 To reduce, and make more efficient, the domestic, industrial and commercial consumption of resources, The ban will reduce the demand for water in the resource use region, improving the efficiency of existing water minimise the generation of waste, encourage its re-use and Medium Low Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial eliminate waste sent to landfill. resource use. It will not result in any increase in the generation of waste. Material assets and 3.2 To promote efficient water resource management and resource use the sustainable management of natural resources, No opportunities to promote the sustainable ensuring water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A management of natural resources have been None None maintained. identified for this option.

Water 4.1 To maintain or improve the quality of rivers, lakes, groundwater, estuarine and coastal waterbodies. The ban will not directly result in, or modify any abstraction (surface water or groundwater). Reduction in demand for water will result in a Low Low Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial reduced requirement for abstraction at Yorkshire Water’s sources, minimising impacts on water levels and river flows in drought conditions.

Water 4.2 To avoid adverse impact on surface and groundwater levels and flows, including when this impacts on habitats Reductions in demand for water would result in a and/or navigation. reduced requirement for increased abstraction Low Low Short-term Temporary Low (beneficial) Medium (beneficial) from Yorkshire Water’s sources, reducing None Minor beneficial associated impacts on surface water and groundwater quality during drought conditions. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.3 To ensure appropriate and sustainable management of abstractions (or compensation flow) to maintain water Reduction in demand for demand for water will supplies whilst protecting ecosystem functions that rely on result in reduced requirement for abstraction from Low Low Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources. Yorkshire Water’s sources, helping provide some protection for water-dependent ecosystems.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils and to protect and enhance geodiversity. No impacts on geology, geomorphology and n/a n/a n/a n/a n/a n/a quality/quantity of soils are anticipated as a result None None of the drought order to ban non-essential use.

Air and Climate 6.1 To maintain and improve air quality. No impacts on air quality are anticipated as a result n/a n/a n/a n/a n/a n/a None None of the ban.

7.1 To conserve and enhance the historic environment, Archaeology and Cultural There may be minor adverse impacts associated heritage assets and their settings and protect Heritage with the setting of some heritage assets, for archaeologically important sites. example, visual impacts on registered parks and gardens and /or the grounds of listed buildings. Notwithstanding these impacts, the ban is considered unlikely to have any direct impact on the Low (beneficial) Low (beneficial) historic environment, heritage assets and Low Low Short-term Temporary Negligible adverse Negligible beneficial Low (adverse) Low (adverse) archaeologically important sites. There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction at Yorkshire Water’s sources, potentially reducing the magnitude of any drought- related effects on archaeology and cultural heritage assets. Landscape and Visual 8.1 To protect, enhance the quality of and improve access There may be some localised adverse effects on Amenity to designated and undesignated landscapes, townscapes and the countryside. townscapes and the setting of some visual amenities due to the ban on watering of gardens and grounds. However, the ban is considered to have no direct impact on landscape and visual Low (beneficial) Low (beneficial) amenity or any changes to access to the Low Low Short-term Temporary Negligible adverse Negligible beneficial Low (adverse) Low (adverse) countryside or open space. There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction at Yorkshire Water’s sources, potentially reducing the magnitude of any drought- related effects on landscape or visual amenity. Part 1 of 2

Drought Plan Option Name: Emergency Drought Order

Drought Plan Option Description: Emergency drought orders allow water companies to restrict supplies to customers through the imposition of rota cuts and/or the introduction of standpipes. These measures exist to deal with the very remote possibility of a drought much worse than any seen in the last century or more in the UK. Emergency Drought Orders have not been put in place in the UK since 1976. Ministers have made it clear that such measures should be avoided at all costs and introduced only as a last resort. The Company will make full use of all other measures before considering whether the severity of drought conditions mean that Emergency Drought Orders might be required.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including An emergency drought order is considered to have fauna designated sites of nature conservation interest and no impact on biodiversity, flora and fauna, other protected habitats and species (with particular regard to than to acknowledge that reduced consumer avoiding the effects of over-abstraction on sensitive sites, demand for water will result in reduced habitats and species and consideration of adaptability to Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) requirement for abstraction from Yorkshire Water None climate change) and to protect and enhance natural capital Minor beneficial sources in drought and, therefore, potential for and the biodiversity and ecosystem services that contribute to the economy. positive impacts on flow, sensitive habitats/species etc.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. An emergency drought order is not likely to have an fauna impact on avoiding the introduction or spreading of N/A N/A N/A N/A N/A N/A INNS, with reduced abstraction requirements None None leaving more water in river systems.

Population and human 2.1 To protect and improve health and well-being and An emergency drought order will provide water health reducTo protect and improve health and well-being savings which will contribute towards maintaining (including promoting the value of the water environment the provision of water supplies for priority essential for health and wellbeing). uses, preventing a complete loss of supply to customers. Drinking water quality may be adversely High (adverse) Medium (adverse) affected due to the intermittent nature of supplies Medium High Short-term Temporary Major adverse Moderate beneficial Medium (beneficial) Medium (beneficial) and there may be a requirement under certain circumstances for customers to boil water for potable uses to protect public health. Customers will face considerable disruption to their daily lives as a result of intermittent supply provision.

Population and human 2.2 To protect and enhance opportunities for formal and Depending on the scale of the drought order health informal recreation. restrictions, there could potentially be significant impacts on recreation and tourism, particularly activities that may benefit directly or indirectly from Medium Moderate Short-term Temporary High (adverse) Medium (adverse) water usage (e.g. swimming pools, sports pitches, Major adverse None the setting of tourist attractions and visual impacts on the grounds of popular tourist sites).

Population and human 2.3 To promote a sustainable economy and thriving Depending on the scale of the required drought health communities with good access to the services they need. order demand restrictions, there could potentially be significant impacts on businesses/economy, particularly those that benefit directly or indirectly from water usage (e.g. window cleaning businesses, sports and leisure facilities, garden and landscape orientated businesses). Hotels and other Temporary to Medium Moderate Short to medium-term High (adverse) Medium (adverse) holiday/tourist accommodation and camping sites Major adverse None permanent will likely be adversely affected. In the worst case scenario, publicity regarding water restrictions may cause a loss of tourism revenue, as tourists delay or cancel trips to the affected area. Hospitality businesses are also likely to be adversely affected.

Material assets and 3.1 To reduce, and make more efficient, the domestic, An emergency drought order will reduce the resource use industrial and commercial consumption of resources, demand for water in the region, thereby reducing minimise the generation of waste, encourage its re-use and Temporary to water resource use. It will not result in any increase Medium Moderate Medium-term Low (beneficial) Medium (beneficial) None Minor beneficial eliminate waste sent to landfill. permanent in the generation of waste.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Reductions in demand for water would result in groundwater, estuarine and coastal waterbodies. reduced requirement for increased abstraction Low Low Short-term Temporary Low (beneficial) Medium (beneficial) from Yorkshire Water’s sources, reducing None Minor beneficial associated impacts on surface water and groundwater quality during drought conditions. Water 4.2 To avoid adverse impact on surface and groundwater The drought order will not directly result in, or levels and flows, including when this impacts on habitats modify any abstraction (surface water or and/or navigation. groundwater). Reduction in demand for water will Medium Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) result in a reduced requirement for abstraction at None Minor beneficial Yorkshire Water’s sources, minimising impacts on water levels and river flows in drought conditions.

Water 4.3 To ensure appropriate and sustainable management of Reduction in demand for demand for water will abstractions (or compensation flow) to maintain water result in reduced requirement for abstraction from supplies whilst protecting ecosystem functions that rely on Medium Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) Yorkshire Water’s sources, helping provide some None Minor beneficial water resources. protection for water-dependent ecosystems.

Water 4.4 To promote water efficiency and measures that enable This option will have a beneficial impact on water, sustainable water use. acknowledging that reduced consumer demand for water will result in reduced requirement for Medium Medium Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial abstraction at source. This may have medium to long-term impacts on consumer water usage.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of No impacts on geology, geomorphology and soils and to protect and enhance geodiversity. quality/quantity of soils are anticipated as a result N/A N/A N/A N/A N/A N/A None None of the use of an emergency drought order.

Air and Climate 6.1 To maintain and improve air quality. No impacts on air quality are anticipated as a result N/A N/A N/A N/A N/A N/A of the use of an emergency drought order. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The use of an emergency drought order will not involve any increased resource use, or increased N/A N/A N/A N/A N/A N/A None None greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate The drought order is a last resort to maintain change. priority essential water supplies to customers; as High (adverse) Small High Short-term Temporary Medium (adverse) such it is not a measure that improves the resilience Major adverse Negligible beneficial Low (beneficial) of the water supply system to climate change threats. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There may be minor adverse impacts associated Heritage heritage assets and their settings and protect with the setting of some heritage assets, for archaeologically important sites. example, visual impacts on registered parks and gardens and /or the grounds of listed buildings due to restrictions on the use of water for any non- essential purposes. Notwithstanding these impacts, the ban is considered unlikely to have any direct Low (adverse) Low (Adverse) Medium Moderate Medium-term Temporary impact on the historic environment, heritage assets Negligible adverse Negligible beneficial Low (beneficial) Low (beneficial) and archaeologically important sites. There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction at Yorkshire Water’s sources, potentially reducing the magnitude of any drought- related effects on archaeology and cultural heritage assets. Landscape and Visual 8.1 To protect, enhance the quality of and improve access There may be some localised adverse effects on Amenity to designated and undesignated landscapes, townscapes townscapes and the setting of some visual and the countryside. amenities due to the restrictions on water use for any non-essential purposes. However, the ban is considered to have no direct impact on landscape and visual amenity or any changes to access to the Low (adverse) Low (adverse) countryside or open space. Medium Moderate Medium-term Temporary Negligible adverse Negligible beneficial Low (beneficial) Low (beneficial) There is the potential for reduced consumer demand for water to result in reduced requirement for abstraction at Yorkshire Water’s sources, potentially reducing the magnitude of any drought- related effects on landscape or visual amenity. Part 1 of 2

Drought Plan Option Name: North Area Reservoir 1

Drought Plan Option Description: Reduced compensation flow release from North Area Reservoir 1 from 13.66 Ml/d to 4.51 Ml/d to the receiving watercourse.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice construction methods) Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Impacts on one SSSI are assessed as negligible. A hydrogeological impact assessment and baseline fauna designated sites of nature conservation interest and monitoring of the groundwater levels in the area indicates that groundwater flow is towards the protected habitats and species (with particular regard to River Ure, which acts as a major sink for groundwater. As such, the risk from an increase in avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to abstraction to the SSSI is considered to be negligible. climate change) and to protect and enhance natural capital The drought option will impact wetted width, especially in shallow areas of the channel, potentially and the biodiversity and ecosystem services that contribute reducing habitat availability in the impacted reaches. to the economy. The drought option is assessed as having an impact on the following NERC and Notable species due Medium Low Short-term Temporary Medium (adverse) High (adverse) to due fragmentation of habitats, increased mortality and siltation of spawning gravels: Moderate adverse None Minor impact for bullhead and Riolus subviolaceus . Moderate impact for brook lamprey, brown trout, water vole and white-clawed crayfish. Major impact for Atlantic salmon, European eel and river lamprey associated with the impacted reaches. There is a moderate risk of deterioration of WFD status (macroinvertebrates and fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The implementation of the drought fauna option will lead to a reduction in flow and is therefore not anticipated to increase the spread of N/A N/A N/A N/A N/A N/A aquatic invasive non-native species. None None

Population and human 2.1 To protect and improve health and well-being (including The drought option will deliver 9.15 Ml/d helping to maintain essential public water supplies during health promoting the value of the water environment for health drought conditions, and therefore help maintain public health and well-being. and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial

Population and human 2.2 To protect and enhance opportunities for formal and Flows during a drought will be low such that further reduction in flows would not be likely to further health informal recreation. reduce the angling quality of the reach. Canoeing on the Ure may still be suitable under drought Medium Moderate Short-term Temporary Low (adverse) Low (adverse) conditions. However, the impact of the drought option is unlikely to be significant against a baseline Negligible adverse None of drought conditions.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in drought conditions, ensuring a health communities with good access to the services they need. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) resilient supply for customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involve modifications to compensation resource use industrial and commercial consumption of resources, flow only and no changes to energy use, generated waste or sustainable designs are envisaged. The minimise the generation of waste, encourage its re-use and Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) option will make use of existing infrastructure. None Minor beneficial eliminate waste sent to landfill.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of natural resources have been identified resource use the sustainable management of natural resources, ensuring N/A N/A N/A N/A N/A N/A for this option. None None water supply for homes and industry in the area is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of three watercourse were considered in the assessment, including Pott groundwater, estuarine and coastal waterbodies. Beck , the River Burn and River Ure.

There is one licenced fish farm presenting an environmental pressure in the impacted reaches in association with the drought option. There is a major risk that the drought option flow reduction would reduce the dissolved oxygen saturation and increase total ammonia concentrations Medium Moderate Short-term Temporary Low (adverse) Medium (adverse) downstream beyond values which support ‘good’ or ‘high’ status for fish and invertebrates. Moderate adverse None

Overall there is a major risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up to 67%) associated reduction in levels and flows, including when this impacts on habitats wetted width and depth over a 31.8km of the impacted reaches. and/or navigation. Medium Moderate Short-term Temporary High (adverse) Medium (adverse) Major adverse None Overall major to moderate adverse impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option would contribute to the maintenance of supply reliability in drought conditions, abstractions (or compensation flow) to maintain water ensuring a resilient supply for customers and economic activity. supplies whilst protecting ecosystem functions that rely on Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial The risk to the WFD Status of the impacted reaches is moderate. water resources. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water efficiency have been identified for sustainable water use. N/A N/A N/A N/A N/A N/A this option. None None

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced compensation flow. It is anticipated that and to protect and enhance geodiversity. Medium Moderate Short-term Temporary Low (adverse) Low (adverse) there will be no impacts on geologically sensitive sites. Negligible adverse None Part 2 of 2

SEA topics and objectives Assessment of option

Air and Climate 6.1 To maintain and improve air quality. The drought option involves the lowering of HOF with no change in existing abstraction volumes and therefore not impact air quality. N/A N/A N/A N/A N/A N/A None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option will not result in an increase in energy use, therefore, no changes to greenhouse N/A N/A N/A N/A N/A N/A gas emissions are envisaged. None None

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought Plan. The Plan aims to ensure change. resilience of water supplies to drought conditions which may become more prevalent due to climate Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) change. None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water-dependent and would not be impacted by the drought Heritage heritage assets and their settings and protect option. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the level of Pott Beck and River Burn will have a visual impact on one Amenity designated and undesignated landscapes, townscapes and AONB. However, there is limited access to the impacted reach with no national trails. the countryside. Medium Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None Part 1 of 2

Drought Plan Option Name: North Area Reservoir 2

Drought Plan Option Description: Reduced compensation flow release from North Area Reservoir 2 from 0.46 Ml/d to 0.15 Ml/d to the receiving watercourses.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including There are no designated sites within the zone of influence of fauna designated sites of nature conservation interest and the drought option. protected habitats and species (with particular regard to The drought option would impact wetted width, especially in avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to shallow areas of the channel, potentially reducing habitat climate change) and to protect and enhance natural capital availability. The drought option would have a moderate and the biodiversity and ecosystem services that contribute Medium Low Short-term Temporary Low (adverse) Medium (adverse) impact on brown trout, white-clawed crayfish, water vole Minor adverse None to the economy. and a minor impact on Graptodytes falvipehave. There is a low risk for deterioration of WFD Status (macroinvertebrates) and minor risk for WFD Status (fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. fauna The implementation of the drought option will lead to a reduction in flow and is therefore not anticipated to increase N/A N/A N/A N/A N/A N/A None None the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being (including The drought option will deliver 0.31 Ml/d helping to maintain health promoting the value of the water environment for health essential public water supplies during drought conditions, and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) and therefore help maintain public health and well being. None Minor beneficial

Population and human 2.2 To protect and enhance opportunities for formal and The drought option would have a low impact on angling and informal recreation health Small Moderate Short-term Temporary Low (adverse) Medium (adverse) drought conditions are not conducive to canoeing. Minor adverse None

Population and human 2.3 To promote a sustainable economy and thriving The drought option will contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a resilient Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, The drought option involves modifications to compensation resource use industrial and commercial consumption of resources, flow only and no significant changes to energy use, minimise the generation of waste, encourage its re-use and generated waste or sustainable designs are envisaged. The eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts of the drought option towards the a number of groundwater, estuarine and coastal waterbodies. watercourses were considered in the assessment.

There is a minor risk that there would be an decrease in the downstream dissolved oxygen saturation and increase total ammonia concentration beyond values which support ‘good’ Medium Moderate Short-term Temporary Low (adverse) Low (adverse) or ‘high’ status for fish and invertebrates. Minor adverse None

Overall there is a minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 67%) over 12.6 km with associated reduction in and/or navigation. wetted width and depth. However, this would be localised where the bank is shallow. The drought option would not impact on the moderate to high flow regime in the receiving Medium Moderate Short-term Temporary High (adverse) Medium (adverse) Major adverse None watercourses.

Overall moderate impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option would contribute to the maintenance of abstractions (or compensation flow) to maintain water supply reliability in drought conditions, ensuring a resilient supplies whilst protecting ecosystem functions that rely on supply for customers and economic activity. water resources. The drought option would be accompanied by water conservation campaigns to promote the efficient use of Medium Low Short-term Temporary Low (beneficial) Low (beneficial) water to protect the environment and safeguard supplies. None Negligible beneficial The overall WFD status is Moderate and water availability is 30-50% in the zone of influence of the option.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in sustainable water use. N/A N/A N/A N/A N/A N/A water efficiency have been identified for this option. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves modifications to compensation flow only and will therefore not result in any emissions to N/A N/A N/A N/A N/A N/A None None atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option will not result in an increase in energy use, therefore, no changes to greenhouse gas emissions are envisaged. The use of existing infrastructure will minimise N/A N/A N/A N/A N/A N/A None None increases in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought which may become more prevalent due None Minor beneficial to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not water- Heritage heritage assets and their settings and protect dependent and would not be impacted by the drought archaeologically important sites. N/A N/A N/A N/A N/A N/A None None option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the level of the watercourse would Amenity designated and undesignated landscapes, townscapes and have a visual impact on an AONB. However, there is limited the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) access to the impacted reach with no national trails. Minor adverse None Part 1 of 2

Drought Plan Option Name: North Area 3 Reservoir

Drought Plan Option Description: Reduced Compensation Flow Release from North Area Reservoir 3 from 0.75 Ml/d to 0.25 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and fauna 1.1 To conserve and enhance biodiversity, The drought option will impact wetted width, especially in including designated sites of nature conservation shallow areas of the channel, potentially reducing habitat interest and protected habitats and species (with availability. particular regard to avoiding the effects of over- abstraction on sensitive sites, habitats and The drought option is assessed as having an impact on the species and consideration of adaptability to following NERC and Notable species due to due fragmentation climate change) and to protect and enhance of habitats, increased mortality and siltation of spawning natural capital and the biodiversity and Medium Low Short-term Temporary Medium (adverse) High (adverse) gravels: Moderate adverse None ecosystem services that contribute to the Major impact on brown trout, economy. Moderate impact on bullhead, water vole and white-clawed crayfish and a minor impact on Hydraena palustris . Overall a moderate risk of deterioration of WFD status (macroinvertebrates and fish).

Biodiversity, flora and fauna 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The implementation of the drought option will lead to a reduction in flow and is therefore not anticipated to increase N/A N/A N/A N/A N/A N/A None None the spread of aquatic invasive non-native species.

Population and human health 2.1 To protect and improve health and well-being The drought option will deliver 0.5 Ml/d helping to maintain (including promoting the value of the water essential public water supplies during drought conditions, and environment for health and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) therefore help maintain public health and well-being. None Minor beneficial

Population and human health 2.2 To protect and enhance opportunities for Flows during a drought will be low such that further reduction formal and informal recreation. in flows would not be likely to further reduce the angling quality of the reach. Canoeing may still be suitable under Medium Moderate Short-term Temporary Low (adverse) Low (adverse) drought conditions. However, the impact of the drought Negligible adverse None option is unlikely to be significant against a baseline of drought conditions.

Population and human health 2.3 To promote a sustainable economy and The option will contribute to the maintenance of supply thriving communities with good access to the reliability in drought conditions, ensuring a resilient supply for services they need. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial customers and economic activity.

Material assets and resource use 3.1 To reduce, and make more efficient, the No impacts on material assets are anticipated. The option domestic, industrial and commercial involve modifications to compensation flow only and no consumption of resources, minimise the changes to energy use, generated waste or sustainable designs generation of waste, encourage its re-use and Small Moderate Short-term Temporary Low (beneficial) Low (beneficial) None None eliminate waste sent to landfill. are envisaged. The option will make use of existing infrastructure.

Material assets and resource use 3.2 To promote efficient water resource No opportunities to promote the sustainable management of management and the sustainable management natural resources have been identified for this option. of natural resources, ensuring water supply for N/A N/A N/A N/A N/A N/A None None homes and industry in the area is maintained.

Water 4.1 To maintain or improve the quality of rivers, Impacts towards water quality in the reaches of the lakes, groundwater, estuarine and coastal watercourse were considered in the assessment. waterbodies. There are two frequently spilling CSO potential presenting an environmental risk in the reach. There is a moderate risk that there would be an increase the downstream total ammonia Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) concentration saturation above values which support ‘good’ or Moderate adverse None ‘high’ status for fish and invertebrates.

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and The drought option would lead to a major reduction in low groundwater levels and flows, including when flows (67%), with associated reduction in wetted width and this impacts on habitats and/or navigation. depth over a 13.8km stretch of impacted reaches. However, habitats and navigation would not be majorly impacted due to the minor hydrological impact on medium to high flow Medium Moderate Short-term Temporary High (adverse) Medium (adverse) Major adverse None regimes.

Overall major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable The drought option would contribute to the maintenance of management of abstractions (or compensation supply reliability in drought conditions, ensuring a resilient flow) to maintain water supplies whilst supply for customers and economic activity. protecting ecosystem functions that rely on Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources. The risk to the WFD Status of the impacted reaches is moderate.

Water 4.4 To promote water efficiency and measures No opportunities to promote long-term improvement in water that enable sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None

Soil, geology and land use 5.1 To protect and enhance the quality and There are no land use changes associated with reduced quantity of soils and to protect and enhance compensation flow. It is anticipated that there will be no geodiversity. Medium Moderate Short-term Temporary Low (adverse) Low (adverse) impacts on geologically sensitive sites. Negligible adverse None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves the lowering of HOF with no N/A N/A N/A N/A N/A N/A change in existing abstraction volumes and therefore not None None impact air quality.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option will not result in an increase in energy use, therefore, no changes to greenhouse gas emissions are N/A N/A N/A N/A N/A N/A None None envisaged.

Air and climate 6.3 To consider the need for adaptive measures Drought options are a key component of Yorkshire Water's for climate change. Drought Plan. The Plan aims to ensure resilience of water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural Heritage 7.1 To conserve and enhance the historic Nearby ancient monuments are not water-dependent and environment, heritage assets and their settings would not be impacted by the drought option. and protect archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual Amenity 8.1 To protect, enhance the quality of and A significant reduction in the level of receiving watercourses improve access to designated and undesignated will have a limited visual impact on an AONB. There is limited landscapes, townscapes and the countryside. Medium Moderate Short-term Temporary Low (adverse) Low (adverse) access to the impacted reach with no national trails. Negligible adverse None Part 1 of 3

Drought Plan Option Name: North Area Reservoir 4

Drought Plan Option Description: Reduced Compensation Flow Release from North Area Reservoir 4 from 18.19 Ml/d to 6.00 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including There are no designated sites nearby. fauna designated sites of nature conservation interest and The drought permit will impact areas of wetted width, protected habitats and species (with particular regard to especially in shallow areas of the channel, potentially avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to reducing habitat availability and the marginal areas where climate change) and to protect and enhance natural capital ammocoetes develop. Specific locations of the shallow and the biodiversity and ecosystem services that contribute sections of the channel, which will be impacted the most to the economy. are uncertain. Major impacts on NERC Fish species within the reach (Atlantic salmon, brook lamprey, brown trout and water vole) due to siltation of spawning gravels, exposure of habitat etc . Further, moderate impacts are expected for brook lamprey, European eel, grayling and bullhead. Small High Short term Temporary Medium (adverse) Medium (adverse) The impact on macroinvertebrates is considered to be short Moderate adverse None term. Migratory fish may also be impacted by the presence of weirs within the reach. Minor impacts are expected to affect Metalype fragilis due to changes in wetted width and depth. Moderate impacts are expected on the WFD status of macroinvertebrates which are temporary and reversible. Minor impacts are expected on the WFD status of fish, which is considered temporary and reversible.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. The implementation of this drought permit is not fauna anticipated to increase the spread of aquatic invasive non- N/A N/A N/A N/A N/A N/A native species because the flows within the rivers will be None None lower.

Population and human 2.1 To protect and improve health and well-being (including The drought permit will help to maintain essential public health promoting the value of the water environment for health water supplies during drought conditions and therefore and wellbeing). Small High Short term Temporary Medium (beneficial) Medium (beneficial) help maintain public health and well-being. The drought None Moderate beneficial option will provide 12.19 Ml/d.

Population and human 2.2 To protect and enhance opportunities for formal and Angling could potentially be adversely affected due to lower health informal recreation. fish stocks, however this is likely to be temporary and will Small Moderate Short term Temporary Low (adverse) Low (adverse) require further assessment at the stage a drought permit is Negligible adverse None applied for.

Material assets and 3.1 To reduce, and make more efficient, the domestic, The option involves modifications to compensation flow resource use industrial and commercial consumption of resources, only and no changes to energy use, generated waste or minimise the generation of waste, encourage its re-use and Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) sustainable designs are envisaged. The option will make use None Minor beneficial eliminate waste sent to landfill. of existing infrastructure.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards water quality in the watercourse were groundwater, estuarine and coastal waterbodies. considered in the assessment.

There is a major risk in relation to a licenced fish farm that the drought option flow reduction would increase the downstream total ammonia concentration above values which support ‘good’ or ‘high’ status for fish, which are Small Moderate Short term Temporary Low (adverse) Medium (adverse) Major adverse None required to maintain the current WFD status for fisheries and macroinvertebrates without mitigation.

Overall there is a major risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought permit will temporary increase abstraction for levels and flows, including when this impacts on habitats water supply, there is a major hydrological impact on the and/or navigation. reach. The drought permit will lead to a major reduction in low flows (67%), with associated reduction in wetted width and depth over a 4.3km stretch of impacted reaches. However these will be localised where the bank is shallow (the specific areas are uncertain). The drought permit will Small Moderate Short term Temporary High (adverse) Medium (adverse) Major adverse None not impact on the moderate to high flow regime in the receiving watercourses.

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of Local water availability is 30%. The drought permit will abstractions (or compensation flow) to maintain water contribute to the maintenance of supply reliability in supplies whilst protecting ecosystem functions that rely on drought conditions, ensuring a resilient supply for water resources. customers and economic activity with no permanent Small Moderate Short term Temporary Medium (beneficial) Medium (beneficial) adverse effects on the environment. None Minor beneficial Drought permit will be accompanied by water conservation campaigns to promote efficient use of water to protect the environment and safeguard supplies.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in sustainable water use. water efficiency have been identified for this option. N/A N/A N/A N/A N/A N/A None None

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There would be no land use changes associated with this and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A drought permit. None None

Air and Climate 6.1 To maintain and improve air quality. The drought permit involves modification to compensation N/A N/A N/A N/A N/A N/A flow only, no changes to energy use are anticipated. There None None are no AQMA nearby. Air and climate 6.2 To reduce greenhouse gas emissions. The drought permit involves modifications to compensation flow only. No changes to greenhouse gas emissions, are N/A N/A N/A N/A N/A N/A None None envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought permits are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short term Temporary Low (beneficial) Medium (beneficial) supplies to drought which may become more prevalent due None Minor beneficial to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No known water-dependent cultural heritage or Heritage heritage assets and their settings and protect archaeology sites are located within or adjacent to the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None impacted reaches. Part 3 of 3

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A major hydrological impact on the watercourse will Amenity designated and undesignated landscapes, townscapes and adversely impact the visual amenity of an AONB, however the countryside. as the river reach forms a small portion of the AONB, impacts are expected to be local and short term. The drought permit will enable higher water levels to be Small Moderate Short term Temporary Low (adverse) Low (adverse) Negligible adverse None maintained for longer in North Area Reservoir 4 (less shoreline exposure), but the receiving reach will experience lower water levels. Part 1 of 3

Drought Plan Option Name: North Area Reservoir 6

Drought Plan Option Description: Reduced compensation flow release from North Area Reservoir 6 from 16.90-3.90 Ml/d to 1.29-5.58 Ml/d to the receiving watercourse.

SEA topics and objectives Assessment of option

Residual adverse effect Scale of effect: geographical &/ Certainty of effect Permanence of Value/sensitivity of Potential residual effect on sensitive receptors Residual beneficial effect Short-term/ medium- Magnitude of effect significance (likely to Topic Objective or population affected (low/ moderate/ effect (permanent/ receptor (low/ medium/ (assuming good practice construction methods) significance (likely to remain term/ long-term (low/ medium/ high) remain after reasonable (small/medium/large) high) temporary) high) Commentary after reasonable mitigation) mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including There are no designated sites within the zone of fauna designated sites of nature conservation interest and influence of the drought option. protected habitats and species (with particular regard to The drought option would impact wetted width, avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to especially in shallow areas of the channel, potentially climate change) and to protect and enhance natural reducing habitat availability. The drought option would capital and the biodiversity and ecosystem services that have a moderate impact on brook lamprey, bullhead Small Low Short-term Temporary Low (adverse) Medium (adverse) Moderate adverse None contribute to the economy. and water vole, and a major impact on brown trout. There is a moderate risk for deterioration of WFD Status (macroinvertebrates) and for WFD Status (fish).

Population and human 2.1 To protect and improve health and well-being The drought option will deliver 2.60-11.30 Ml/d helping health (including promoting the value of the water environment to maintain essential public water supplies during for health and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) drought conditions, and therefore help maintain public None Minor beneficial health and well being.

Population and human 2.2 To protect and enhance opportunities for formal and There is canoeing known to take place in the impacted health informal recreation reaches, however, it is unlikely to be impacted over the duration of the drought permit. Canoeing events rely on specific high volume releases, although these may Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Negligible adverse None reduce during a drought the reduction is not related to the drought permit for North Area 6.

Population and human 2.3 To promote a sustainable economy and thriving The drought option will contribute to the maintenance health communities with good access to the services they need. of supply reliability in drought conditions, ensuring a Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) resilient supply for customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, The drought option involves modifications to resource use industrial and commercial consumption of resources, compensation flow only and no significant changes to minimise the generation of waste, encourage its re-use energy use, generated waste or sustainable designs are and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial envisaged. The option will make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Washburn were groundwater, estuarine and coastal waterbodies. considered in the assessment.

The water quality is described as supporting high WFD status for fish and invertebrates without the drought option. Water quality indicators including dissolved oxygen saturation, total ammonia concentration saturation and orthophosphate concentrations Medium Moderate Short-term Temporary Low (adverse) Low (adverse) throughout the study area are assessed to be at minor Minor adverse None risk of deterioration during the implementation of the drought option.

Overall there is a minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in levels and flows, including when this impacts on habitats low flows (67%) over 3 km with an associated reduction and/or navigation. in wetted width and depth. However, this would be localised where the bank is shallow. The drought option would not impact on the moderate to high flow regime Medium Moderate Short-term Temporary High (adverse) Medium (adverse) in the receiving watercourses. Major adverse None

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option would contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought conditions, supplies whilst protecting ecosystem functions that rely on ensuring a resilient supply for customers and economic water resources. activity. Medium Low Short-term Temporary Low (beneficial) Low (beneficial) The drought option would be accompanied by water None Minor beneficial conservation campaigns to promote the efficient use of water to protect the environment and safeguard supplies.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement sustainable water use. N/A N/A N/A N/A N/A N/A in water efficiency have been identified for this option. None None

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with reduced soils and to protect and enhance geodiversity. compensation flow. It is anticipated that there will be N/A N/A N/A N/A N/A N/A no impacts on geologically sensitive sites. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves modifications to compensation flow only and will therefore not result in N/A N/A N/A N/A N/A N/A any emissions to atmosphere. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option will not result in an increase in energy use, therefore, no changes to greenhouse gas emissions are envisaged. The use of existing N/A N/A N/A N/A N/A N/A None None infrastructure will minimise increases in greenhouse gas emissions.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not Heritage heritage assets and their settings and protect water-dependent and would not be impacted by the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None drought option. Part 3 of 3

SEA topics and objectives Assessment of option

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no landscape designations in proximity to the Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A impacted reaches of the drought option. None None and the countryside. Part 1 of 2

Drought Plan Option Name: North West Area 1

Drought Plan Option Description: A reduction in the North West Area 1 from 6-8 Ml/d to 2.67-5.33 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts towards fauna designated sites of nature conservation interest and the impacted reaches, including: the stranding of individuals protected habitats and species (with particular regard to or groups; deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology or climate change) and to protect and enhance natural capital behaviour. and the biodiversity and ecosystem services that contribute The drought option is assessed as having the following to the economy. impacts: Minor adverse impact on barbel and grayling. Moderate Small Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None adverse impact on water vole, bullhead and European eel. Major adverse impact on white-clawed crayfish, brown trout and brook lamprey.

Overall there is a major-moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option will deliver up to 5.3 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and The drought option will have a moderate impact extensive health informal recreation. non-club administered angling along the River Worth. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply for Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) designs are envisaged. The option will make use of existing None Minor beneficial infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of three watercourse were groundwater, estuarine and coastal waterbodies. considered in the assessment, including the River Worth and River Aire .

The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is moderate for dissolved oxygen, ammonia and phosphate. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Moderate adverse None Overall there is a moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major to moderate levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with associated reduction and/or navigation. in wetted width and depth over a 8.5 km stretch of the impacted reaches Overall major hydrological impact towards the impacted Small Moderate Short-term Temporary High (adverse) Medium (adverse) reaches. Major adverse None

Overall major to minor impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of abstractions (or compensation flow) to maintain water supply reliability in drought conditions, ensuring a resilient supplies whilst protecting ecosystem functions that rely on supply for customers and economic activity. water resources. The drought option will be accompanied by water conservation campaigns to promote efficient use of water to Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) protect the environment and safeguard supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and N/A N/A N/A N/A N/A N/A would therefore not result in any increases in emissions to None None atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes to greenhouse N/A N/A N/A N/A N/A N/A gas emissions are envisaged. None None

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of archaeological Heritage heritage assets and their settings and protect importance within proximity to the impacted reaches. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no landscape designations in proximity to the Amenity designated and undesignated landscapes, townscapes and impacted reaches of the drought option. the countryside. N/A N/A N/A N/A N/A N/A None None Part 1 of 3

Drought Plan Option Name: North West Area Reservoir 2

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 2 from 3.25-5.25 Ml/d to 1.07-1.73 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Potential residual effect on sensitive receptors Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ (assuming good practice construction methods) significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) Commentary after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that option is assessed as having an impact on the contribute to the economy. following NERC and notable species: Minor impact for Riolus subviolaceus. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for bullhead, white-clawed Moderate adverse None crayfish, grayling, water vole and European eel. Major impact for brown trout and brook lamprey.

Overall there is a major risk of deterioration of WFD status (fish) and a moderate risk of deterioration of WFD status (invertebrates).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for fauna dispersal. The implementation of the drought N/A N/A N/A N/A N/A N/A option will lead to a reduction in flow and is None None therefore not anticipated to increase the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 3.52 Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment during drought conditions, and therefore help for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is extensive non-club administered angling health informal recreation. along the River Rother. However, flows during a drought will be low such that further reduction in Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None flows would not be likely to further reduce the angling quality of the reach.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involve modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of four watercourse were groundwater, estuarine and coastal waterbodies. considered in the assessment, including: the Bridgehouse Beck, River Worth, River Aire and River Aire from to River Calder.

Water quality pressures for this drought option include a STW. There is a moderate risk that there would be an increase in total ammonia concentration above values which supports good WFD status for fish and invertebrates. There is also moderate risk that there would be a decrease in Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) dissolved oxygen concentration below values which Moderate adverse None support good WFD status for fish and invertebrates.

Overall there is a moderate to minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major to levels and flows, including when this impacts on habitats moderate reduction in low flows (up to 67%), with and/or navigation. an associated reduction in wetted width and depth over a 18.6 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards Small Moderate Short-term Temporary Major (adverse) Medium (adverse) the impacted reaches. Major adverse None

Overall major to minor impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for water resources. customers and economic activity. The drought option will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term sustainable water use. improvement in water efficiency have been N/A N/A N/A N/A N/A N/A None None identified for this option.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not result N/A N/A N/A N/A N/A N/A None None in any increases in emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no N/A N/A N/A N/A N/A N/A changes to greenhouse gas emissions are None None envisaged. Part 3 of 3

SEA topics and objectives Assessment of option

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial which may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water- Heritage heritage assets and their settings and protect dependent and would not be impacted by the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of Bridgehouse Amenity to designated and undesignated landscapes, townscapes Beck and Leeming Water would have a visual and the countryside. impact on the landscape setting of the Calder/Aire Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Link and Bronte Way National Trails respectively. Minor adverse None However, the reduced flow of the reaches would be short-term and temporary. Part 1 of 3

Drought Plan Option Name: North West Area Reservoir 3

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 3 from 2.75-4.00 Ml/d to 0.91-1.32 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The impact of reduced flows will result in a number fauna designated sites of nature conservation interest and of impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that contribute option is assessed as having an impact on the to the economy. following NERC and notable species: Minor impact for bullhead. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for white-clawed crayfish, Moderate adverse None grayling, bullhead, river lamprey and European eel. Major impact for brown trout and brook lamprey. There is a major risk to WFD status (fish) and a moderate risk of deterioration of WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 2.68Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment for during drought conditions, and therefore help health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is extensive non-club administered angling health informal recreation. along the River Worth. However, flows during a Small Moderate Short-term Temporary Low (adverse) Low (adverse) drought will be low such that further reduction in Negligible adverse None flows would not be likely to further reduce the angling quality of the reach.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involve modifications to compensation flow minimise the generation of waste, encourage its re-use and only and no changes to energy use, generated waste eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water quality pressures include one WwTW. There is a moderate risk that the drought option flow reduction would reduce the dissolved oxygen saturation and increase total ammonia concentrations downstream beyond values which support ‘good’ or ‘high’ status for fish and Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) invertebrates. Moderate adverse None

Overall there is a moderate to minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major to levels and flows, including when this impacts on habitats moderate reduction in low flows (up to 67%), with and/or navigation. associated reduction in wetted width and depth over a 18.9 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the Small Moderate Short-term Temporary High (adverse) Medium (adverse) impacted reaches. Major adverse None

Overall major to minor impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought permit will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with and to protect and enhance geodiversity. reduced compensation flow. It is anticipated that N/A N/A N/A N/A N/A N/A there will be no impacts on geologically sensitive None None sites.

SEA topics and objectives Assessment of option

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of Heritage heritage assets and their settings and protect archaeological importance within proximity to the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None impacted reaches.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the level of Bridgehouse Amenity designated and undesignated landscapes, townscapes and Beck and Leeming Water would have a visual impact the countryside. on the landscape setting of the Calder/Aire Link and Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Bronte Way National Trails respectively. However, Minor adverse None the reduced flow of the reaches would be short- term and temporary. Part 1 of 3

Drought Plan Option Name: North West Area Reservoir 4

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 4 from 1.80-3.60 Ml/d to 1.20 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals protected habitats and species (with particular regard to or groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; climate change) and to protect and enhance natural capital and changes in morphology or behaviour. The and the biodiversity and ecosystem services that drought option is assessed as having an impact contribute to the economy. on the following NERC and notable species: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for brown trout, bullhead, Moderate adverse None white-clawed crayfish and water vole. There is a minor risk of deterioration of WFD status (invertebrates) and a moderate risk to WFD status (fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse fauna for dispersal. The implementation of the drought option will lead to a reduction in flow N/A N/A N/A N/A N/A N/A and is therefore not anticipated to increase None None the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 2.40Ml/d, health reducTo protect and improve health and well-being helping to maintain essential public water (including promoting the value of the water environment supplies during drought conditions, and for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial therefore help maintain public health and well- being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the health informal recreation. impacted reach. However, flows during a drought will be low such that further reduction Small Moderate Short-term Temporary Low (adverse) Low (adverse) in flows would not be likely to further reduce Negligible adverse None the angling quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance health communities with good access to the services they need. of supply reliability in drought conditions, Small High Short-term Temporary Low (beneficial) Medium (beneficial) ensuring a resilient supply for customers and None Minor beneficial economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. resource use industrial and commercial consumption of resources, The option involves modifications to minimise the generation of waste, encourage its re-use and compensation flow only and no changes to eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) energy use, generated waste or sustainable None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Harden Beck groundwater, estuarine and coastal waterbodies. watercourse were considered in the assessment.

One STW presents a local water quality pressure, particularly associated with ammonia quality which will slightly raise the risk of water quality deterioration. The risk of water quality deterioration below what Small Moderate Short-term Temporary Low (adverse) Medium (adverse) supports good WFD status for fish and Minor adverse None invertebrates is minor to moderate for dissolved oxygen and total ammonia.

Overall there is a moderate to minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with and/or navigation. associated reduction in wetted width and depth over 7.9 km of the impacted reaches. Major hydrological impacts are anticipated Small Moderate Short-term Temporary High (adverse) Medium (adverse) towards the impacted reaches. Major adverse None

Overall moderate impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for water resources. customers and economic activity. The drought option will be accompanied by Small High Short-term Temporary Low (beneficial) Medium (beneficial) water conservation campaigns to promote None Minor beneficial efficient use of water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing N/A N/A N/A N/A N/A N/A abstraction volumes and would therefore not None None result in any increases in emissions to atmosphere. Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, N/A N/A N/A N/A N/A N/A therefore, no changes to greenhouse gas None None emissions are envisaged. Part 3 of 3

SEA topics and objectives Assessment of option

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of change. Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial drought conditions which may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of Heritage heritage assets and their settings and protect archaeological importance within proximity to archaeologically important sites. N/A N/A N/A N/A N/A N/A None None the impacted reaches.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the flow level of the Amenity to designated and undesignated landscapes, townscapes impacted reaches would have a visual impact and the countryside. on the landscape setting of several national Small Moderate Short-term Temporary Low (adverse) Medium (adverse) trails that run alongside Denholme Beck. Minor adverse None However, the reduced flow of the reaches would be short-term and temporary. Part 1 of 3

Drought Plan Option Name: North West Area Reservoir 5

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 5 from 6.30 Ml/d to 2.08 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals protected habitats and species (with particular regard to or groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; climate change) and to protect and enhance natural capital and changes in morphology or behaviour. The and the biodiversity and ecosystem services that drought option is assessed as having an impact contribute to the economy. on the following NERC and notable species: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Minor impact for barbel, bullhead and Moderate adverse None grayling. Moderate impact for brown trout, water vole and European eel. There is a minor risk of deterioration of WFD status (invertebrates & fish).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 4.22Ml/d, health reducTo protect and improve health and well-being helping to maintain essential public water (including promoting the value of the water environment supplies during drought conditions, and for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial therefore help maintain public health and well- being.

Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on health informal recreation. the impacted reach. The potential impact on the angling club is uncertain, however, flows Small Low Short-term Temporary Medium (adverse) Low (adverse) during a drought will be low such that a Minor adverse None further reduction in flow is not likely to reduce the angling quality of the reach.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Aire groundwater, estuarine and coastal waterbodies. were considered in the assessment.

Water quality pressures include one WwTW. Due to this moderate hydrological impact in the upper reach, the risk of water quality deterioration below what can support good WFD status for fish and invertebrates is moderate for total ammonia, dissolved oxygen Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None and phosphate.

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with and/or navigation. associated reduction in wetted width and depth over 6.5km of the impacted reaches. Moderate hydrological impacts are anticipated Small Moderate Short-term Temporary Major (adverse) Medium (adverse) towards the impacted reaches. Major adverse None

Overall minor impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for water resources. customers and economic activity. The drought option will be accompanied by water conservation campaigns to promote Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial efficient use of water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term sustainable water use. N/A N/A N/A N/A N/A N/A improvement in water efficiency have been None None identified for this option. Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with soils and to protect and enhance geodiversity. reduced compensation flow. It is anticipated N/A N/A N/A N/A N/A N/A that there will be no impacts on geologically None None sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing N/A N/A N/A N/A N/A N/A abstraction volumes and would therefore not None None result in any increases in emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, N/A N/A N/A N/A N/A N/A therefore, no changes to greenhouse gas None None emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of change. Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial drought conditions which may become more prevalent due to climate change. Part 3 of 3

SEA topics and objectives Assessment of option

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of Heritage heritage assets and their settings and protect archaeological importance within proximity to archaeologically important sites. N/A N/A N/A N/A N/A N/A None None the impacted reaches.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of Harden Amenity to designated and undesignated landscapes, townscapes Beck would have a visual impact on the and the countryside. landscape setting of several national trails that Small Moderate Short-term Temporary Low (adverse) Medium (adverse) run alongside Harden Beck. However, the Minor adverse None reduced flow of the reaches would be short- term and temporary. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 6

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 6 from 1.00 Ml/d to 0.33 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Reduced flow levels in the impacted reaches will fauna designated sites of nature conservation interest and result in a number of impacts, including: the protected habitats and species (with particular regard to stranding of individuals or groups; deterioration or avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to loss of habitats; fragmentation of habitats; climate change) and to protect and enhance natural capital increased mortality; and changes in morphology or and the biodiversity and ecosystem services that behaviour. The drought option is assessed as having contribute to the economy. an impact on the following NERC and notable Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None species: Moderate impact for bullhead. Major impact for brown trout.

There is a moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 0.67 Ml/d, health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment during drought conditions, and therefore help for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted health informal recreation. reach. The potential impact on the angling club is Small Low Short-term Temporary Low (adverse) Low (adverse) low and flows during a drought will be low such that Negligible adverse None a further reduction in flow is not likely to reduce the angling quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a Small High Short-term Temporary Low (beneficial) Medium (beneficial) resilient supply for customers and economic None Minor beneficial activity. Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Aire were groundwater, estuarine and coastal waterbodies. considered in the assessment.

There is a low risk of deterioration of WFD status associated with dissolved oxygen and ammonia in Small Moderate Short-term Temporary Low (adverse) Medium (adverse) the impacted reaches. Minor adverse None

Overall there is a minor risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with associated reduction and/or navigation. in wetted width and depth over 3.4km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) However, these impacts will be short-term and Major adverse None temporary.

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought permit will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are 16 scheduled ancient monuments within Heritage heritage assets and their settings and protect proximity to the impacted reaches. However, the archaeologically important sites. N/A N/A N/A N/A N/A N/A monuments are not water dependent and would None None not be impacted by the drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of Harden Beck Amenity to designated and undesignated landscapes, townscapes would have a visual impact on the landscape setting and the countryside. of Millennium Way and Dales Way Link which run Small Moderate Short-term Temporary Low (adverse) Medium (adverse) alongside Loadpit Beck. However, the reduced flow Minor adverse None of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 7

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 7 from 0.79 Ml/d to 0.26 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that option is assessed as having an impact on the Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None contribute to the economy. following NERC and Notable species: Major impact for brown trout and moderate impact for bullhead. There is a moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 0.53Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment during drought conditions, and therefore help for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and The presence of angling on Jum Beck is unknown. health informal recreation. Flows during a drought will be low such that a Small Low Short-term Temporary Low (adverse) Low (adverse) further reduction in flow is not likely to reduce the Negligible adverse None angling quality of the reach.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Gill Beck groundwater, estuarine and coastal waterbodies. watercourse were considered in the assessment.

There is a medium risk of deterioration of WFD status associated with phosphate in the impacted Small Moderate Short-term Temporary Low (adverse) Medium (adverse) reaches. Moderate adverse None

Overall there is a moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with associated reduction and/or navigation. in wetted width and depth over 1km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and to flow depleted reaches. However, these impacts will Small Moderate Short-term Temporary Major (adverse) Medium (adverse) be short-term and temporary. Major adverse None

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought permit will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of Heritage heritage assets and their settings and protect archaeological importance in proximity to the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None impacted reaches of the drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no landscape assets in proximity to the Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A impacted reaches of the drought option. None None and the countryside. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 8

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 8 from 0.43 Ml/d to 0.14 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts, including: fauna designated sites of nature conservation interest and the stranding of individuals or groups; deterioration or loss of protected habitats and species (with particular regard to habitats; fragmentation of habitats; increased mortality; and avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to changes in morphology or behaviour. The drought option is climate change) and to protect and enhance natural capital assessed as having an impact on the following NERC and notable and the biodiversity and ecosystem services that contribute Small Low Short-term Temporary Medium (adverse) Medium (adverse) species: Moderate adverse None to the economy. Minor impact for bullhead. Major impact for white-clawed crayfish and brown trout. Moderate impact for bullhead. There is a moderate risk of deterioration of WFD status (invertebrates & fish).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 0.29Ml/d helping to health reducTo protect and improve health and well-being maintain essential public water supplies during drought (including promoting the value of the water environment for Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and well- None Minor beneficial health and wellbeing). being.

Population and human 2.2 To protect and enhance opportunities for formal and The presence of angling on Weecher Brow Beck is unknown. health informal recreation. Flows during a drought will be low such that a further reduction Small Low Short-term Temporary Low (adverse) Low (adverse) in flow is not likely to reduce the angling quality of the reach. Minor adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply communities with good access to the services they need. health Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) reliability in drought conditions, ensuring a resilient supply for None Minor beneficial customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable designs eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial are envisaged. The option will make use of existing infrastructure.

There is a moderate risk of deterioration of WFD status Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) associated with phosphate in the impacted reaches. Moderate adverse None

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows levels and flows, including when this impacts on habitats (up to 67%), with associated reduction in wetted width and and/or navigation. depth over 6.4 km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of supply abstractions (or compensation flow) to maintain water reliability in drought conditions, ensuring a resilient supply for supplies whilst protecting ecosystem functions that rely on customers and economic activity. water resources. The drought option will be accompanied by water conservation Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) campaigns to promote efficient use of water to protect the None Minor beneficial environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would N/A N/A N/A N/A N/A N/A therefore not result in any increases in emissions to None None atmosphere. Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes to greenhouse gas N/A N/A N/A N/A N/A N/A None None emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are four Scheduled Monuments in proximity to the Heritage heritage assets and their settings and protect impacted reaches. However, they are not water dependent and archaeologically important sites. N/A N/A N/A N/A N/A N/A would not be impacted by the drought option. None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in flow levels would have a visual impact Amenity designated and undesignated landscapes, townscapes and on the landscape setting of Millennium Way National Trail which the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) runs alongside Weecher Brow Beck. However, the reduced flow Minor adverse None of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 9

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 9 from 2.41 Ml/d to 0.80 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts, fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; protected habitats and species (with particular regard to deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in climate change) and to protect and enhance natural capital morphology or behaviour. The drought option is and the biodiversity and ecosystem services that assessed as having an impact on the following NERC contribute to the economy. Small Low Short-term Temporary Medium (adverse) Medium (adverse) and Notable species: Moderate adverse None Moderate impact for bullhead and grayling. Major impact for brown trout. There is a major risk of deterioration of WFD status (fish) and a moderate risk for WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 1.61Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help None Minor beneficial for health and wellbeing). maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Silsden Beck. health informal recreation. However, flows during a drought will be low such that Small Low Short-term Temporary Low (adverse) Low (adverse) a further reduction in flow is not likely to reduce the Negligible adverse None angling quality of the reach.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste and eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Silsden Beck groundwater, estuarine and coastal waterbodies. watercourse were considered in the assessment.

There is a low risk of deterioration of WFD status associated with dissolved oxygen, ammonia and Small Moderate Short-term Temporary Low (adverse) Medium (adverse) phosphate in the impacted reaches. Minor adverse None

Overall there is a minor risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with an associated reduction and/or navigation. in wetted width and depth over 3km of Silsden Beck. Major hydrological impacts are anticipated towards the impacted reaches. However, these impacts will be Small Moderate Short-term Temporary High (adverse) Medium (adverse) limited to the low flow regime of the water course. Major adverse None

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought option will be accompanied by water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with soils and to protect and enhance geodiversity. reduced compensation flow. It is anticipated that N/A N/A N/A N/A N/A N/A there will be no impacts on geologically sensitive None None sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not result N/A N/A N/A N/A N/A N/A None None in any increases in emissions to atmosphere.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of archaeological Heritage heritage assets and their settings and protect importance in proximity to the impacted reaches of archaeologically important sites. N/A N/A N/A N/A N/A N/A None None the drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of Silsden Beck Amenity to designated and undesignated landscapes, townscapes would have a visual impact on the landscape setting and the countryside. of Millennium Way National Trail which runs Small Moderate Short-term Temporary Low (adverse) Medium (adverse) alongside Weecher Brow Beck. However, the reduced Minor adverse None flow of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 10

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 10 from 1.19 Ml/d to 0.39 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including A reduction in flow levels will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that option is assessed as having an impact on the contribute to the economy. following NERC and notable species: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Minor impact for bullhead. Moderate impact for brown trout, brook lamprey, and white-clawed crayfish. There is a moderate risk of deterioration of WFD status (fish) and a minor risk for WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 0.80Ml/d, health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment during drought conditions, and therefore help for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Embasy Beck. health informal recreation. However, flows during a drought will be low such Small Moderate Short-term Temporary Low (adverse) Low (adverse) that a further reduction in flow is not likely to reduce Negligible adverse None the angling quality of the reach.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Haw Beck and Eller groundwater, estuarine and coastal waterbodies. Beck watercourses were considered in the assessment.

There is a medium risk of deterioration of WFD Small Moderate Short-term Temporary Low (adverse) Medium (adverse) status associated with dissolved oxygen and Minor adverse None ammonia in the impacted reaches.

Overall there is a moderate to minor risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows, with an associated reduction in wetted and/or navigation. width and depth over 6.8 km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and to flow depleted reaches. However, these impacts will be limited to Small Moderate Short-term Temporary High (adverse) Medium (adverse) the low flow regime of the water course. Major adverse None

Overall major to minor impacts are anticipated towards river habitats associated with the drought option

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought option will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with soils and to protect and enhance geodiversity. reduced compensation flow. It is anticipated that N/A N/A N/A N/A N/A N/A there will be no impacts on geologically sensitive None None sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing N/A N/A N/A N/A N/A N/A abstraction volumes and would therefore not result None None in any increases in emissions to atmosphere.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, One Scheduled Ancient Monument is in proximity to Heritage heritage assets and their settings and protect the impacted reaches of the drought option. archaeologically important sites. However, the monument is not water dependent N/A N/A N/A N/A N/A N/A and would not be affected by implementation of the None None drought measure.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no landscape features or national trails in Amenity to designated and undesignated landscapes, townscapes proximity to the impacted reaches of the drought and the countryside. N/A N/A N/A N/A N/A N/A None None option. Part 1 of 2

Drought Plan Option Name: North West Area Reservoir 11

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 11 from 3.80-15.10 Ml/d to 1.25-4.98 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that option is assessed as having an impact on the contribute to the economy. Small Low Short-term Temporary Medium (adverse) Medium (adverse) following NERC and notable species: Moderate adverse None Moderate impact for bullhead. Major impact for Atlantic Salmon, white-clawed crayfish and brown trout There is a major risk of deterioration of WFD status (fish) and a moderate risk of deterioration of WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 10.12 Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment during drought conditions, and therefore help for health and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and The reduction in flows and levels in the impacted informal recreation. health Small Low Short-term Temporary Low (adverse) Low (adverse) reaches would have a minor impact on casual Minor adverse None angling activities.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste and eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Barben Beck/River groundwater, estuarine and coastal waterbodies. Dibb Catchment watercourse were considered in the assessment.

Water quality is described as typically supporting high WFD status for fish and invertebrates without the drought option. Water quality throughout the Small Moderate Short-term Temporary Low (adverse) Medium (adverse) study area assessed as at low risk of deteriorating, Minor adverse None from implementation of the drought option.

Overall there is a minor risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with an associated and/or navigation. reduction in wetted width and depth over 5.2 km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought option will be accompanied by water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term sustainable water use. N/A N/A N/A N/A N/A N/A improvement in water efficiency have been None None identified for this option.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, One Scheduled Ancient Monument is in proximity to Heritage heritage assets and their settings and protect the impacted reaches. However, it is not water archaeologically important sites. dependent and would not be impacted by the N/A N/A N/A N/A N/A N/A None None drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in proximity to Amenity to designated and undesignated landscapes, townscapes Small N/A N/A N/A N/A N/A the impacted reaches. None None and the countryside. Part 1 of 3

Drought Plan Option Name: North West Area Reservoir 12

Drought Plan Option Description: Reduced compensation flow release from North West Area Reservoir 12 from 0.09Ml/d to 0.03 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. The drought and the biodiversity and ecosystem services that contribute option is assessed as having an impact on the to the economy. following NERC and notable species: Small Low Short-term Temporary Low (adverse) Medium (adverse) Moderate adverse None Major impact for brown trout. Moderate impact for white-clawed crayfish, bullhead and water vole. There is a moderate risk of deterioration of WFD status (invertebrates & fish).

Population and human 2.1 To protect and improve health and well-being and The drought option will deliver up to 0.06Ml/d health reducTo protect and improve health and well-being helping to maintain essential public water supplies (including promoting the value of the water environment for during drought conditions, and therefore help health and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There are a number of footpaths, including the health informal recreation. official Bradford Millennium Way footpath. There is however no angling on the reservoir or the watercourses flowing down to the River Wharfe.

Flows during a drought will be low such that a Small Low Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None further reduction in flow is not likely to impact recreational activities at the reservoir or watercourses downstream.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation minimise the generation of waste, encourage its re-use and flow only and no changes to energy use, generated eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Carr Beck groundwater, estuarine and coastal waterbodies. watercourse were considered in the assessment.

There is a low risk of deterioration of WFD status associated with total ammonia, oxygen and Small Moderate Short-term Temporary Low (adverse) Medium (adverse) phosphate in the impacted reaches. Minor adverse None

Overall there is a minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with associated and/or navigation. reduction in wetted width and depth over 5.1 km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Major (adverse) Medium (adverse) reaches. Major adverse None

Overall major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for water resources. customers and economic activity. The drought option will be accompanied by water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use None Minor beneficial of water to protect the environment and safeguard supplies. Water availability is at least 95% in the zone of influence of the drought option.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial which may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are four Scheduled Monuments in proximity Heritage heritage assets and their settings and protect (<500m) to the impacted reaches. However, they archaeologically important sites. N/A N/A N/A N/A N/A N/A are not water dependent and would not be None None impacted by the drought option. Part 3 of 3

SEA topics and objectives Assessment of option

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A small reduction in flow levels would have a Amenity designated and undesignated landscapes, townscapes and limited visual impact on the landscape setting of the countryside. the Bradford Millennium Way footpath. However, Small Moderate Short-term Temporary Low (adverse) Medium (adverse) the reduced flow of the reaches would be short- Minor adverse None term and temporary. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 1

Drought Plan Option Description: Reduced compensation flow release from South Area Reservoir 1 from 2.70 Ml/d to 0.89 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts, including: the fauna designated sites of nature conservation interest and protected habitats and species (with particular regard to stranding of individuals or groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, fragmentation of habitats; increased mortality; and changes in habitats and species and consideration of adaptability to morphology or behaviour. The drought option is assessed as having climate change) and to protect and enhance natural capital and the biodiversity and ecosystem services that contribute an impact on the following NERC and notable species: Major impact for brook lamprey, brown trout, European eel and to the economy. Small Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None grayling. Moderate impact for white-clawed crayfish, water vole, barbel, bullhead and river lamprey . There is a moderate risk of deterioration of WFD status (invertebrates) and a major risk to WFD status (fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. fauna A Fishery and informal angling is present on the impacted reach N/A N/A N/A N/A N/A N/A that would be subject to major flow reductions. However, these None None impacts will be minor against a baseline of drought conditions.

Population and human 2.1 To protect and improve health and well-being (including health promoting the value of the water environment for health The drought option will deliver up to 1.81 Ml/d, helping to and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) maintain essential public water supplies during drought conditions, None Minor beneficial and therefore help maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and health informal recreation. A fishery and informal angling is present on the impacted reach Small Moderate Short-term Temporary Low (adverse) Medium (adverse) that would be subject to major flow reductions. However, these Minor adverse None impacts will be minor against a baseline of drought conditions.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability health communities with good access to the services they need. Small High Short-term Temporary Low (beneficial) Medium (beneficial) in drought conditions, ensuring a resilient supply for customers and None Minor beneficial economic activity. Material assets and 3.1 To reduce, and make more efficient, the domestic, resource use industrial and commercial consumption of resources, No impacts on material assets are anticipated. The option involves minimise the generation of waste, encourage its re-use and modifications to compensation flow only and no changes to energy eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial use, generated waste or sustainable designs are envisaged. The option will make use of existing infrastructure.

One WwTW presents a water quality pressure in the impacted reaches. The risk of water quality deterioration below what Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None supports 'good' WFD status for fish and invertebrates is moderate for total ammonia, dissolved oxygen and phosphate.

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater levels and flows, including when this impacts on habitats The drought option would lead to a major reduction in low flows and/or navigation. over 1.8 km of Scout Dyke and a major reduction over 38.6 km of Small Moderate Short-term Temporary High (adverse) Medium (adverse) the River Don. Major adverse None Overall moderate to minor adverse impacts are anticipated towards river habitats associated with the drought option Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of abstractions (or compensation flow) to maintain water The drought option will contribute to the maintenance of supply supplies whilst protecting ecosystem functions that rely on reliability in drought conditions, ensuring a resilient supply for water resources. customers and economic activity. The drought option will be accompanied by water conservation Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial campaigns to promote efficient use of water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils and to protect and enhance geodiversity. There are no land use changes associated with reduced N/A N/A N/A N/A N/A N/A compensation flow. It is anticipated that there will be no impacts None None on geologically sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with N/A N/A N/A N/A N/A N/A no change in existing abstraction volumes and would therefore not None None result in any increases in emissions to atmosphere.

6.2 To reduce greenhouse gas emissions. Air and climate The drought option would not be associated with an increase in N/A N/A N/A N/A N/A N/A energy consumption, therefore, no changes to greenhouse gas None None emissions are envisaged. Air and climate 6.3 To consider the need for adaptive measures for climate change. Drought options are a key component of Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial drought conditions which may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Heritage heritage assets and their settings and protect There are numerous Scheduled Ancient Monuments in proximity to archaeologically important sites. N/A N/A N/A N/A N/A N/A the impacted reaches of the drought option. However, they are not None None water dependent, as such, they would not be impacted.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in proximity to the impacted Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A None None and the countryside. reaches of the drought option. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 2

Drought Plan Option Description: Reduced flow release from South Area Reservoir 2 from 9.09-11.82 Ml/d to 3.00 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts, fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; protected habitats and species (with particular regard to deterioration or loss of habitats; fragmentation of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to increased mortality; and changes in morphology or climate change) and to protect and enhance natural capital behaviour. The drought option is assessed as having an and the biodiversity and ecosystem services that contribute impact on the following NERC and notable species: to the economy. Minor impact for Oreodytes davisii. Moderate impact for white-clawed crayfish, water vole, Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) barbel, bullhead and river lamprey. Moderate adverse None Major impact for brook lamprey, brown trout, European eel and grayling. The risk of deterioration to WFD status (fish) is major and moderate to WFD status (invertebrates). Impacts on Upper River Don: Deepcar to Hillsborough LWS are assessed as moderate.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. fauna The implementation of the drought option will lead to a N/A N/A N/A N/A N/A N/A reduction in flow and is therefore not anticipated to increase None None the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being (including The drought option will provide 6.09 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Medium High Short-term Temporary Low (beneficial) Medium (beneficial) conditions and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is informal angling present on the River Don which health informal recreation. would be subject to moderate adverse effects. Canoeing Medium Moderate Short-term Temporary Low (adverse) Low (adverse) takes place on the reaches, however, drought conditions Negligible adverse None would not be conducive to canoeing.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will contribute to the health communities with good access to the services they need. maintenance of supply reliability in drought conditions, ensuring a resilient supply for customers and economic Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial activity with no permanent adverse effects on the environment.

Material assets and 3.1 To reduce, and make more efficient, the domestic, The drought option involves a reduction in compensation resource use industrial and commercial consumption of resources, release only and no changes to energy use, generated waste minimise the generation of waste, encourage its re-use and or sustainable designs are envisaged. The option will make eliminate waste sent to landfill. Medium High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Don were considered groundwater, estuarine and coastal waterbodies. in the assessment.

Four WwTWs present water quality pressures in the Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) impacted reaches. The risk of water quality deterioration is Moderate adverse None minor for dissolved oxygen and moderate for total ammonia and phosphate concentrations. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in flows levels and flows, including when this impacts on habitats over 38.6km of the River Don. However, impacts on habitats and/or navigation. and navigation would be short-term and restricted to the low flow regimes of the water courses. Medium Moderate Short-term Temporary High (adverse) Medium (adverse) Overall minor to moderate adverse impacts are anticipated Major adverse None towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of abstractions (or compensation flow) to maintain water supply reliability in drought conditions, ensuring a resilient supplies whilst protecting ecosystem functions that rely on supply for customers and economic activity. water resources. Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) Drought option will be accompanied by water conservation None Minor beneficial campaigns to promote efficient use of water to protect the environment and safeguard supplies.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an N/A N/A N/A N/A N/A N/A increase in energy consumption, therefore, no changes to None None greenhouse gas emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no known water-dependent cultural heritage or Heritage heritage assets and their settings and protect archaeology sites in proximity to the impacted reaches of archaeologically important sites. N/A N/A N/A N/A N/A N/A None None the drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to The Trans Pennine Trail and Sheffield County Walk run in Amenity designated and undesignated landscapes, townscapes and close proximity to the River Don which forms part of their the countryside. Medium Moderate Short-term Temporary Low (adverse) Medium (adverse) landscape setting. The moderate reduction in flows would Minor adverse None have a small visual impact on the setting of the trails. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 3

Drought Plan Option Description: Reduced compensation flow release from South Area Reservoir 3 from 16.00-21.70 Ml/d to 5.28 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows will result in a number of impacts, fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; protected habitats and species (with particular regard to deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology climate change) and to protect and enhance natural capital or behaviour. The drought option is assessed as having an and the biodiversity and ecosystem services that contribute impact on the following NERC and notable species: to the economy. Major for brook lamprey, brown trout, European eel. Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Moderate impact for white-clawed crayfish, water vole, barbel, bullhead, grayling and river lamprey. There is a major risk of deterioration of WFD status (fish) and a moderate risk to WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option will deliver up to 10.72 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Medium (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Moderate beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and Canoeing and informal angling is present on the impacted health informal recreation. reach that would be subject to major/moderate flow Medium Moderate Short-term Temporary Low (adverse) Medium (adverse) reductions. However, these impacts will be minor against Minor adverse None a baseline of drought conditions.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply Small High Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management resource use the sustainable management of natural resources, ensuring of natural resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Don and Little Don groundwater, estuarine and coastal waterbodies. were considered in the assessment.

Three WwTWs present water quality pressures in the impacted reaches. The risk of water quality deterioration Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None below what supports good WFD status for fish and invertebrates is moderate for dissolved oxygen, total ammonia and phosphate.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows over 8.7km of the Little Don and the 34.7 km of the and/or navigation. River Don. However, impacts on habitats and navigation would be short-term and restricted to the low flow Medium Moderate Short-term Temporary High (adverse) Medium (adverse) regimes of the water courses. Major adverse None Overall minor to moderate adverse impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of abstractions (or compensation flow) to maintain water supply reliability in drought conditions, ensuring a resilient supplies whilst protecting ecosystem functions that rely on supply for customers and economic activity. water resources. The drought option will be accompanied by water conservation campaigns to promote efficient use of water Medium High Short-term Temporary Low (beneficial) Medium (beneficial) to protect the environment and safeguard supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience Small High Short-term Temporary Low (beneficial) Medium (beneficial) of water supplies to drought conditions which may None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no designated heritage assets in proximity to Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A the impacted reaches of the drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access to The Trans Pennine trail is in close proximity to the Amenity designated and undesignated landscapes, townscapes and impacted reach that will be subject to major flow the countryside. Medium Moderate Short-term Temporary Low (adverse) Low (adverse) reductions. However, the visual impact will be negligible in Negligible adverse None the context of existing drought conditions. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 4

Drought Plan Option Description: Reduced compensation flow release from South Area Reservoir 4 from 9.10-12.00 Ml/d to 3.00 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flow levels would potentially reduce habitat fauna designated sites of nature conservation interest and availability and impact the following NERC and Notable protected habitats and species (with particular regard to species: avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to Major impact for brook lamprey, brown trout and climate change) and to protect and enhance natural capital European eel. and the biodiversity and ecosystem services that contribute Medium Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for white-clawed crayfish, water vole, Moderate adverse None to the economy. barbel, bullhead, grayling and river lamprey . Minor impact for Riolus subviolaceus . The risk of deterioration to WFD status (fish) is major and moderate to WFD status (macroinvertebrates). Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for fauna dispersal. The implementation of the drought option will N/A N/A N/A N/A N/A N/A lead to a reduction in flow and is therefore not anticipated None None to increase the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being (including The drought permit will provide up to 6.10 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and Angling could potentially be adversely affected due to informal recreation. health Medium High Short-term Temporary Low (adverse) Low (adverse) impacts on fish population/ distribution, however, the Negligible adverse None impacts would be short-term and temporary.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought permit will contribute to health communities with good access to the services they need. the maintenance of supply reliability in drought conditions, Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) ensuring a resilient supply for customers and economic None Minor beneficial activity with no permanent adverse effects on the environment. Material assets and 3.1 To reduce, and make more efficient, the domestic, The drought option involves a reduction in compensation resource use industrial and commercial consumption of resources, release only and no changes to energy use, generated minimise the generation of waste, encourage its re-use and waste or sustainable designs are envisaged. The option will eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Don and Ewden Beck groundwater, estuarine and coastal waterbodies. were considered in the assessment.

Two WwTWs present water quality pressures in the Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) impacted reaches. The risk of water quality deterioration is Moderate adverse None moderate for total ammonia and phosphate concentrations and minor for dissolved oxygen concentrations.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows over 1.7 km of Ewden Beck and major reduction over and/or navigation. 23.3 km of the River Don with an associated reduction in wetted width and depth. However, impacts on habitats and navigation would be short-term and restricted to the low Medium Moderate Short-term Temporary High (adverse) Medium (adverse) flow regimes of the water courses. Moderate adverse None Overall minor to major adverse impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought permit will contribute to the maintenance of abstractions (or compensation flow) to maintain water supply reliability in drought conditions, ensuring a resilient supplies whilst protecting ecosystem functions that rely on supply for customers and economic activity with no water resources. permanent adverse effects on the environment. Medium High Short-term Temporary Low (beneficial) Medium (beneficial) The drought permit will be accompanied by water None Minor beneficial conservation campaigns to promote efficient use of water to protect the environment and safeguard supplies.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions which may become more Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial prevalent due to climate change.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to The Trans Pennine Trail and Sheffield County Walk run in Amenity designated and undesignated landscapes, townscapes and close proximity to the River Don which forms part of their the countryside. landscape setting. The moderate reduction in flows would Medium Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None have a small visual impact on the setting of the trails. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 5

Drought Plan Option Description: Reduced compensation flow release from South Area Reservoir 5 from 18.00 Ml/d to 5.94 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Reduced flows in the reaches would result in increased mortality fauna designated sites of nature conservation interest and and risk of stranding of NERC species. There are two LWS protected habitats and species (with particular regard to moderate impacts predicted, Acorn Hill and Little Matlock Wood avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to LWS and Malin Bridge to River Don LWS. climate change) and to protect and enhance natural capital The drought option is assessed as having an impact on the and the biodiversity and ecosystem services that contribute following NERC and notable species: to the economy. Major adverse impact on white-clawed crayfish, brook lamprey, Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None brown trout and European eel. Moderate adverse impact on water vole, barbel, bullhead, grayling and river lamprey. There is a major risk to the deterioration of WFD status (fish) and a moderate risk to the deterioration of WFD status (invertebrates).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The fauna implementation of the drought option will lead to a reduction in N/A N/A N/A N/A N/A N/A flow and is therefore not anticipated to increase the spread of None None aquatic invasive non-native species. Population and human 2.1 To protect and improve health and well-being (including The drought option will provide 12.06 Ml/d helping to maintain health promoting the value of the water environment for health essential public water supplies during drought conditions and and wellbeing). Small High Short-term Temporary Medium (beneficial) Medium (beneficial) therefore help maintain public health and well-being. None Moderate beneficial

Population and human 2.2 To protect and enhance opportunities for formal and Angling could be adversely affected due to impacts on fish health informal recreation. population/distribution in downstream reaches. However, flows during a drought will already be low, such that further reduction Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None in flows would not be likely to further reduce the angling quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will contribute to the health communities with good access to the services they need. maintenance of supply reliability in drought conditions, ensuring Small High Short-term Temporary Medium (beneficial) Medium (beneficial) a resilient supply for customers and economic activity. None Moderate beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, The drought option involves a reduction in compensation release resource use industrial and commercial consumption of resources, only; and no changes to energy use, generated waste or minimise the generation of waste, encourage its re-use and Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) sustainable designs are envisaged. The option will make use of None Minor beneficial eliminate waste sent to landfill. existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of two watercourses were considered in groundwater, estuarine and coastal waterbodies. the assessment.

One WwTW presents a water quality risk in the impacted reaches. There is a moderate risk that the reduction in low flows would lead to a decreased downstream dissolved oxygen saturation, below values which support 'good' or 'high' status for fish and Medium Moderate Short-term Temporary Medium (adverse) Medium (adverse) invertebrates. There is also a moderate risk that ammonia Moderate adverse None concentrations would increase above values which support ‘good’ or ‘high’ status for fish and invertebrates.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater There would be a major adverse impact on flow levels in the levels and flows, including when this impacts on habitats impacted reaches with an associated reduction in wetted width and/or navigation. and depth. However, these impacts would be localised to places where the bank is shallow. Medium Moderate Short-term Temporary High (adverse) Medium (adverse) The drought option would lead to a major reduction in low flows Major adverse None (up to 67%) associated reduction in wetted width and depth over a 21.2km of the impacted reaches. Overall major to minor adverse impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of supply abstractions (or compensation flow) to maintain water reliability in drought conditions, ensuring a resilient supply for supplies whilst protecting ecosystem functions that rely on customers and economic activity with no permanent adverse water resources. Medium Moderate Short-term Temporary Low (beneficial) Medium (beneficial) effects on the environment. Drought option will be accompanied None Minor beneficial by water conservation campaigns to promote efficient use of water to protect the environment and safeguard supplies.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There would be no land use changes associated with this drought and to protect and enhance geodiversity. option. The impact on fluvial geomorphology due to lower flows Medium Moderate Short-term Temporary Medium (adverse) Low (adverse) is assessed as minor adverse, due to potential for increased Minor adverse None erosion of river banks and sediment deposition at selected sites.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water supplies Medium High Short-term Temporary Low (beneficial) Medium (beneficial) to drought which may become more prevalent due to climate None Minor beneficial change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no known water-dependent cultural heritage or Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A archaeology sites in proximity to the impacted reaches. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in the immediate vicinity and Amenity to designated and undesignated landscapes, townscapes the visual impact on the surrounding countryside would be short- and the countryside. Medium Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None term and temporary. Part 1 of 2

Drought Plan Option Name: South Area Reservoir 6

Drought Plan Option Description: Reduced compensation flow release from South Area Reservoir 6 from 10.30 Ml/d to 3.40 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of fauna designated sites of nature conservation interest and impacts, including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to fragmentation of habitats; increased mortality; and climate change) and to protect and enhance natural capital changes in morphology or behaviour. and the biodiversity and ecosystem services that contribute Impacts on Malin Bridge to River Don LWS are to the economy. assessed as moderate. The drought option is assessed as having an impact on the following NERC and notable species: Small Low Short-term Temporary Medium (adverse) Medium (adverse) Major impact for white-clawed crayfish, brook Moderate adverse None lamprey, brown trout and European eel. Moderate impact for water vole, barbel, bullhead, grayling and river lamprey. Minor impact for Sisyra terminalis . There is a moderate risk of deterioration of WFD status (macroinvertebrates) and a major risk to WFD status (fish).

Population and human 2.1 To protect and improve health and well-being (including The drought option will deliver up to 6.90 Ml/d health promoting the value of the water environment for health helping to maintain essential public water supplies and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is informal angling present on the impacted health informal recreation. reaches. However, flows during a drought will be low such that further reduction in flows would not be likely to further reduce the angling quality of the Small Moderate Short-term Temporary Low (adverse) Low (adverse) reach. Canoeing takes place on the reaches, Negligible adverse None however, existing drought conditions would not be conducive to canoeing so impacts would be negligible.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use and only and no changes to energy use, generated waste eliminate waste sent to landfill. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards the following reaches are included groundwater, estuarine and coastal waterbodies. in the assessment; Rivelin, Loxley and Don.

One WwTW presents a water quality risk in the impacted reaches. The risk of water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) deterioration below what supports good WFD status Moderate adverse None for fish and invertebrates is moderate for dissolved oxygen, ammonia and phosphate.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%) associated reduction in and/or navigation. wetted width and depth over 23.2km of the impacted reaches. However, impacts on habitats and navigation would be short-term and restricted Small Moderate Short-term Temporary High (adverse) Medium (adverse) to the low flow regimes of the water courses. Major adverse None Overall major to minor adverse impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the abstractions (or compensation flow) to maintain water maintenance of supply reliability in drought supplies whilst protecting ecosystem functions that rely on conditions, ensuring a resilient supply for customers water resources. and economic activity. The drought option will be accompanied by water Small High Short-term Temporary Low (beneficial) Medium (beneficial) conservation campaigns to promote efficient use of None Minor beneficial water to protect the environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure Small High Short-term Temporary Low (beneficial) Medium (beneficial) resilience of water supplies to drought conditions None Minor beneficial which may become more prevalent due to climate change. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, A Scheduled Ancient Monument is in proximity to Heritage heritage assets and their settings and protect the impacted reaches. However, the asset is not archaeologically important sites. N/A N/A N/A N/A N/A N/A water dependent so would not be impacted by the None None drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no landscape designations in proximity to Amenity designated and undesignated landscapes, townscapes and the impacted reaches of the drought option. the countryside. N/A N/A N/A N/A N/A N/A None None Part 1 of 3

Drought Plan Option Name: South West Area Reservoir 1

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 1 from 2.70 Ml/d to 0.89 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of fauna designated sites of nature conservation interest and impacts on fish species including: the stranding protected habitats and species (with particular regard to of individuals or groups; deterioration or loss avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to of habitats; fragmentation of habitats; climate change) and to protect and enhance natural capital increased mortality; and changes in and the biodiversity and ecosystem services that morphology or behaviour. As a result, NERC contribute to the economy. and Notable species would be subject to the Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) following adverse impacts: Moderate adverse None Major/Moderate impact for brown trout Moderate impact for white-clawed crayfish, grayling, bullhead and water vole. Minor impact for barbel. There is a moderate risk of deterioration of WFD status (fish and invertebrates).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse fauna for dispersal. The implementation of the drought option would lead to a reduction in N/A N/A N/A N/A N/A N/A flow and is therefore not anticipated to None None increase the spread of aquatic invasive non- native species.

Population and human 2.1 To protect and improve health and well-being The drought option would deliver up to 1.81 health (including promoting the value of the water environment Ml/d helping to maintain essential public for health and wellbeing). water supplies during drought conditions, and Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial therefore help maintain public health and well- being.

Population and human 2.2 To protect and enhance opportunities for formal and There are no opportunities or threats to health informal recreation. recreational activities for this drought option. N/A N/A N/A N/A N/A N/A None None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance health communities with good access to the services they need. of supply reliability in drought conditions, ensuring a resilient supply for customers and Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial economic activity.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Graining groundwater, estuarine and coastal waterbodies. Water, Hebden Water and Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of two listed CSOs during rainfall events. Due to the presence of consented discharges the risk of water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None deterioration below what supports good WFD status for fish and invertebrates is moderate for dissolved oxygen and ammonia.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with an and/or navigation. associated reduction in wetted width and depth over a 23.8 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) reaches, including two flow depleted reaches. Moderate adverse None

Overall minor to moderate impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by abstractions (or compensation flow) to maintain water water conservation campaigns to promote supplies whilst protecting ecosystem functions that rely on efficient use of water to protect the water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) environment and safeguard supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term sustainable water use. N/A N/A N/A N/A N/A N/A improvement in water efficiency have been None None identified for this option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with soils and to protect and enhance geodiversity. reduced compensation flow. It is anticipated Small Moderate Short-term Temporary Low (adverse) Low (adverse) that there will be no impacts on geologically Negligible adverse None sensitive sites.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not N/A N/A N/A N/A N/A N/A None None result in any increases in emissions to atmosphere.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of change. Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial drought conditions which may become more prevalent due to climate change. Part 3 of 3

SEA topics and objectives Assessment of option

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the Amenity to designated and undesignated landscapes, townscapes impacted reaches would have a visual impact and the countryside. on the landscape setting of the Pennine Bridleway National Trail. However, the Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None reduced water levels of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 2

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 2 from 3.78-7.56 Ml/d to 1.25-2.59 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fauna designated sites of nature conservation interest and fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology climate change) and to protect and enhance natural capital or behaviour. As a result, NERC and Notable species would and the biodiversity and ecosystem services that contribute be subject to the following adverse impacts: to the economy. Major/moderate impact for brown trout. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Moderate impact for water vole, grayling and bullhead. Minor impact for barbel. There is a minor/moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 5.07 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Medium (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Moderate beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is an angling club and casual angling present on the health informal recreation. impacted reaches. The impact on the club and some of the casual angling activities would range from minor to moderate. There are a number of other recreational Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) activities in proximity to the impacted reaches, however, Moderate adverse None they would not be affected over the duration of the implementation of the drought option.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply Small High Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management resource use the sustainable management of natural resources, ensuring of natural resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Hebden Water and River groundwater, estuarine and coastal waterbodies. Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of two listed CSOs during rainfall events. Due to the presence of consented discharges, the risk of water quality deteriorating from Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) implementation of the drought option below what Moderate adverse None supports good WFD status for fish and invertebrates, is moderate for dissolved oxygen, total ammonia and phosphate.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 67%), with an associated reduction in wetted and/or navigation. width and depth over a 23.8 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall minor to moderate impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water abstractions (or compensation flow) to maintain water conservation campaigns to promote efficient use of water supplies whilst protecting ecosystem functions that rely on to protect the environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) Water availability is at less than 30% in the zone of None Minor beneficial influence of the drought option.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes to N/A N/A N/A N/A N/A N/A None None greenhouse gas emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions which may Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No Scheduled Ancient Monuments would be impacted by Heritage heritage assets and their settings and protect the flow reductions over the duration of the archaeologically important sites. N/A N/A N/A N/A N/A N/A implementation of the drought option. None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape the countryside. Small Moderate Short-term Temporary Low (adverse) Low (adverse) setting of the Calder/Aire Link National Trail. However, the Negligible adverse None reduced water levels of the reaches would be short-term and temporary. Part 1 of 3

Drought Plan Option Name: South West Area Reservoir 3

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 3 from 3.24-6.50 Ml/d to 1.07-2.15 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of fauna designated sites of nature conservation interest and impacts on fish species including: the stranding of protected habitats and species (with particular regard to individuals or groups; deterioration or loss of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; fragmentation of habitats; increased climate change) and to protect and enhance natural capital mortality; and changes in morphology or behaviour. and the biodiversity and ecosystem services that contribute As a result, NERC and Notable species would be to the economy. subject to the following adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for white-clawed crayfish, water Moderate adverse None vole and brown trout. Minor impact for barbel, grayling and Helophorus strigifrons. There is a minor/moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 2.17-4.36 health promoting the value of the water environment for health Ml/d helping to maintain essential public water and wellbeing). Small High Short-term Temporary Medium (beneficial) Medium (beneficial) supplies during drought conditions, and therefore None Moderate beneficial help maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is an angling club and casual angling present health informal recreation. on the impacted reaches. The impact on the club and some of the casual angling activities would range from minor to moderate. There are a number Small Moderate Short-term Temporary Moderate (adverse) Moderate (adverse) of other recreational activities in proximity to the Moderate adverse None impacted reaches, however, they would not be affected over the duration of the implementation of the drought option.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use and only and no changes to energy use, generated eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Graining Water, groundwater, estuarine and coastal waterbodies. Hebden Water and Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of two listed CSO during rainfall events. Due to the presence of consented discharges, the risk of water quality deteriorating from implementation of the Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) drought option below what supports good WFD Moderate adverse None status for fish and invertebrates, is moderate for dissolved oxygen and total ammonia.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with an associated and/or navigation. reduction in wetted width and depth over a 24 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the Small Moderate Short-term Temporary Major (adverse) Medium (adverse) impacted reaches. Major adverse None

Overall minor to moderate impacts are anticipated towards river habitats associated with the drought option.

SEA topics and objectives Assessment of option

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No Scheduled Ancient Monuments would be Heritage heritage assets and their settings and protect impacted by the flow reductions over the duration archaeologically important sites. N/A N/A N/A N/A N/A N/A of the implementation of the drought option. None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the Amenity designated and undesignated landscapes, townscapes and impacted reaches would have a negligible visual the countryside. impact on the landscape setting of the Calder/Aire Small Moderate Short-term Temporary Low (adverse) Low (adverse) Link National Trail. However, the reduced water Negligible adverse None levels of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 4

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 4 from 3.42 Ml/d to 1.13 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Hebble Brook. The reduced flows informal recreation. health Small Moderate Short-term Temporary Medium (adverse) Low (adverse) would have a minor adverse effect on the angling quality of the Minor adverse None reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in communities with good access to the services they need. health Small High Short-term Temporary Low (beneficial) Medium (beneficial) drought conditions, ensuring a resilient supply for customers and None Minor beneficial economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, modifications to compensation flow only and no changes to energy minimise the generation of waste, encourage its re-use and use, generated waste or sustainable designs are envisaged. The eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Calder and Hebble Brook groundwater, estuarine and coastal waterbodies. watercourses were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of one listed CSO during rainfall events. Due to the presence of consented discharges the risk of water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) deterioration below what supports good WFD status for fish and Moderate adverse None invertebrates is moderate for dissolved oxygen and ammonia.

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up levels and flows, including when this impacts on habitats to 67%), with an associated reduction in wetted width and depth and/or navigation. over a 24.2 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall minor to moderate impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A compensation flow. It is anticipated that there will be no impacts on None None geologically sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not N/A N/A N/A N/A N/A N/A result in any increases in emissions to atmosphere. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in N/A N/A N/A N/A N/A N/A energy consumption, therefore, no changes to greenhouse gas None None emissions are envisaged. Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought change. Plan. The Plan aims to ensure resilience of water supplies to drought Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions which may become more prevalent due to climate None Minor beneficial change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, The nearby Scheduled Ancient Monuments are not water-dependent Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A and would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the impacted reaches Amenity to designated and undesignated landscapes, townscapes would have a visual impact on the landscape setting of the and the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Calderdale Way National Trail. However, the reduced water levels of Minor adverse None the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 5

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 5 from 1.33 Ml/d to 0.44 Ml/d. [Environment Agency Drought Order] SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts fauna designated sites of nature conservation interest and on fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to of habitats; increased mortality; and changes in climate change) and to protect and enhance natural capital morphology or behaviour. As a result, NERC and Notable and the biodiversity and ecosystem services that species would be subject to the following adverse contribute to the economy. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) impacts: Moderate adverse None Moderate impact for white-clawed crayfish, water vole and brown trout. Minor impact for bullhead. There is a moderate risk of deterioration of WFD status (invertebrates and fish).

Population and human 2.1 To protect and improve health and well-being The drought option would deliver up to 0.89 Ml/d health (including promoting the value of the water environment helping to maintain essential public water supplies for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help maintain None Minor beneficial public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Walsden Water. The informal recreation. health Small Moderate Short-term Temporary Low (adverse) Medium (adverse) reduced flows would have a minor adverse effect on the Minor adverse None angling quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient Small High Short-term Temporary Low (beneficial) Medium (beneficial) supply for customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow only minimise the generation of waste, encourage its re-use and no changes to energy use, generated waste or and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial sustainable designs are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been identified ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Walsden Water and groundwater, estuarine and coastal waterbodies. River Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Due to existing water quality Small Moderate Short-term Temporary Low (adverse) Medium (adverse) pressures, water quality throughout the study area Minor adverse None would be at a moderate risk of deteriorating for total ammonia and oxygen from the implementation of the drought options.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in levels and flows, including when this impacts on habitats low flows (up to 67%), with an associated reduction in and/or navigation. wetted width and depth over a 10.8km stretch of the impacted reaches. There is additionally one moderately impacted flow depleted reach for ~200m of Calder 1 between the offtake, currently utilised for non- evaporative cooling. Moderate to major hydrological Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None impacts are anticipated towards the impacted reaches.

Overall minor to major impacts are anticipated towards river habitats associated with the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with reduced soils and to protect and enhance geodiversity. compensation flow. It is anticipated that there will be no N/A N/A N/A N/A N/A N/A impacts on geologically sensitive sites. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes N/A N/A N/A N/A N/A N/A None None to greenhouse gas emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience Small High Short-term Temporary Low (beneficial) Medium (beneficial) of water supplies to drought conditions which may None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water-dependent Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A and would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the Amenity to designated and undesignated landscapes, townscapes impacted reaches would have a visual impact on the and the countryside. landscape setting of the Calderdale Way National Trail. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) However, the reduced water levels of the reaches would Minor adverse None be short-term and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 6

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 6 from 3.02 Ml/d to 1.00 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. fauna The implementation of the drought option would lead to a N/A N/A N/A N/A N/A N/A reduction in flow and is therefore not anticipated to increase None None the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 2.01 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and well- None Minor beneficial being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted reaches. The health informal recreation. reduced flows would have a minor adverse effect on the angling Small Moderate Short-term Temporary Medium (adverse) Low (adverse) Minor adverse None quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply for Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable designs eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Calder, Booth Dean Clough, and groundwater, estuarine and coastal waterbodies. Luddenden Brook were considered in the assessment.

The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is minor for Small Low Short-term Temporary Low (adverse) Medium (adverse) dissolved oxygen, ammonia and phosphate. Moderate adverse None

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows levels and flows, including when this impacts on habitats (up to 67%), with an associated reduction in wetted width and and/or navigation. depth over a 13 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Major (adverse) Medium (adverse) reaches. Major adverse None

Overall minor to major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation abstractions (or compensation flow) to maintain water campaigns to promote efficient use of water to protect the supplies whilst protecting ecosystem functions that rely on environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Water availability is at least 70% in the zone of influence of the drought option. Minor beneficial Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A compensation flow. It is anticipated that there will be no None None impacts on geologically sensitive sites.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes to greenhouse gas N/A N/A N/A N/A N/A N/A None None emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets in proximity to the impacted Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A reaches of the drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape setting of the countryside. the Calderdale Way National Trail. However, the reduced water Small Moderate Short-term Temporary Low (adverse) Medium (adverse) levels of the reaches would be short-term and temporary so the Minor adverse None impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 7

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 7 from 3.20-10.60 Ml/d to 1.06-3.50 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fish species fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; deterioration or loss of protected habitats and species (with particular regard to habitats; fragmentation of habitats; increased mortality; and changes in avoiding the effects of over-abstraction on sensitive sites, habitats and species) and consider adaptability to climate morphology or behaviour. As a result, NERC and Notable species would change. be subject to the following adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Major impact for brown trout. Moderate adverse None Moderate impact for otter, water vole, white-clawed crayfish, bullhead and grayling. There is a moderate risk of deterioration of WFD status (invertebrates and fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The fauna implementation of the drought option would lead to a reduction in flow N/A N/A N/A N/A N/A N/A and is therefore not anticipated to increase the spread of aquatic None None invasive non-native species. Population and human 2.1 To protect and improve health and well-being and The drought option would deliver up to 7.10 Ml/d helping to maintain health reduce inequalities essential public water supplies during drought conditions, and therefore Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial help maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted reaches. The reduced health informal recreation. flows would have a minor adverse effect on the angling quality of the Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in health communities with good access to the services they need. drought conditions, ensuring a resilient supply for customers and Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, modifications to compensation flow only and no changes to energy use, minimise the generation of waste, encourage its re-use and Small High Short-term Temporary Low (beneficial) Medium (beneficial) generated waste or sustainable designs are envisaged. The option will None Minor beneficial eliminate waste sent to landfill. make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne, River Calder and River groundwater, estuarine and coastal waterbodies. Holme were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Therefore, the risk of water quality deterioration below what supports good WFD status for Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Moderate adverse None fish and invertebrates is moderate for dissolved oxygen and ammonia.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up to levels and flows, including when this impacts on habitats 67%), with an associated reduction in wetted width and depth over a and/or navigation. 22.3 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and towards two flow Small Moderate Short-term Temporary Major (adverse) Medium (adverse) depleted reaches. Major adverse None

Overall, major impacts are anticipated towards river habitats associated with the drought option. Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by water conservation water supplies whilst protecting ecosystem functions that campaigns to promote efficient use of water to protect the environment rely on water resources including contributing to the and safeguard supplies. achievement of WFD objectives Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial Water availability is less than 30% in the zone of influence of the drought option. Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced compensation and to protect and enhance geodiversity. flow. It is anticipated that there will be no impacts on geologically N/A N/A N/A N/A N/A N/A None None sensitive sites. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no N/A N/A N/A N/A N/A N/A change in existing abstraction volumes and would therefore not result in None None any increases in emissions to atmosphere. Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy N/A N/A N/A N/A N/A N/A consumption, therefore, no changes to greenhouse gas emissions are None None envisaged. Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought change. Plan. The Plan aims to ensure resilience of water supplies to drought Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions which may become more prevalent due to climate change. None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are a number of nearby heritage assets but they are not water- Heritage heritage assets and their settings and protect dependent and would not be impacted by the drought option. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in proximity to the impacted Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A reaches of the drought option. None None and the countryside. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 8

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 8 from 4.80-6.90 Ml/d to 1.58-2.28 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 4.62 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) High (beneficial) conditions, and therefore help maintain public health and well- None Minor beneficial being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted reaches. health informal recreation. However, flows during a drought will be low such that further reduction in flows would only lead to a minor reduction in the Small Moderate Short-term Temporary Low (adverse) Medium (adverse) angling quality of the reach. The caravan site would not be Minor adverse None impacted over the duration of the implementation of the drought option.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply for Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no changes minimise the generation of waste, encourage its re-use and to energy use, generated waste or sustainable designs are eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial envisaged. The option will make use of existing infrastructure.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of two listed CSOs during rainfall events. Due to consented discharges, the risk of water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) deterioration upon the implementation of the drought option Moderate adverse None would be moderate for total ammonia, oxygen and phosphate,

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows levels and flows, including when this impacts on habitats (up to 67%), with an associated reduction in wetted width and and/or navigation. depth over a 78.4 km of the impacted reaches. Major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Major (adverse) Medium (adverse) reaches and towards six flow depleted reaches. Major adverse None

Overall, minor to major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by water conservation abstractions (or compensation flow) to maintain water campaigns to promote efficient use of water to protect the supplies whilst protecting ecosystem functions that rely on environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in N/A N/A N/A N/A N/A N/A energy consumption, therefore, no changes to greenhouse gas None None emissions are envisaged. Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no scheduled Ancient Monuments that would be Heritage heritage assets and their settings and protect impacted by the drought option. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no landscape designations in proximity to the impacted Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A reaches of the drought option. None None and the countryside. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 9

Drought Plan Option Description: Reduced compensation flow release from Calder Area Reservoir 9 from 1.98-4.0 Ml/d to 0.65-1.32 Ml/d. [Environment Agency Drought Order] SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 2.68 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought conditions, and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) and therefore help maintain public health and well-being. None Minor beneficial

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted reaches. However, health informal recreation. flows during a drought will be low such that further reduction in Small Moderate Short-term Temporary Low (adverse) Low (adverse) flows would not be likely to further reduce the angling quality of the Negligible adverse None reach.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of natural the sustainable management of natural resources, ensuring resource use N/A N/A N/A N/A N/A N/A resources have been identified for this option. None None water supply for homes and industry in the area is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne and River Holme were groundwater, estuarine and coastal waterbodies. considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Due to existing water quality pressures, water quality throughout the study Small Moderate Short-term Temporary Low (adverse) Medium (adverse) area would be at a moderate risk of deteriorating for total ammonia Moderate adverse None and oxygen from the implementation of the drought options.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up levels and flows, including when this impacts on habitats to 67%), with an associated reduction in wetted width and depth and/or navigation. over a 21.6 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and towards Small Moderate Short-term Temporary Major (adverse) Medium (adverse) three flow depleted reaches. Major adverse None

Overall, moderate to major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation abstractions (or compensation flow) to maintain water campaigns to promote efficient use of water to protect the supplies whilst protecting ecosystem functions that rely on environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Water availability is less than 30% in the zone of influence of the drought option. Minor beneficial Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not N/A N/A N/A N/A N/A N/A result in any increases in emissions to atmosphere. None None

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water-dependent and would not Heritage heritage assets and their settings and protect be impacted by the drought option. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no landscape designations in proximity to the impacted Amenity to designated and undesignated landscapes, townscapes reaches of the drought option. and the countryside. N/A N/A N/A N/A N/A N/A None None Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 10

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 10 from 18.00 Ml/d to 6.00 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fish fauna designated sites of nature conservation interest and species including: the stranding of individuals or groups; protected habitats and species (with particular regard to deterioration or loss of habitats; fragmentation of habitats; increased avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to mortality; and changes in morphology or behaviour. As a result, climate change) and to protect and enhance natural capital NERC and Notable species would be subject to the following adverse and the biodiversity and ecosystem services that contribute impacts: to the economy. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Major impact for brown trout. Moderate adverse None Moderate impact for white-clawed crayfish, water vole, and bullhead. Minor impacts regarding grayling and barbel. There is a moderate risk of deterioration of WFD status (fish and invertebrates). Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The fauna implementation of the drought option would lead to a reduction in N/A N/A N/A N/A N/A N/A flow and is therefore not anticipated to increase the spread of None None aquatic invasive non-native species. Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 12.00 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought conditions, and wellbeing). Small High Short-term Temporary Medium (beneficial) Medium (beneficial) and therefore help maintain public health and well-being. None Moderate beneficial

Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on the impacted reaches. health informal recreation. Due to the major reduction in water flows and levels there would be Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) a moderate adverse impact on the angling quality of the reach. Moderate adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in communities with good access to the services they need. health Small High Short-term Temporary Medium (beneficial) Medium (beneficial) drought conditions, ensuring a resilient supply for customers and None Moderate beneficial economic activity.

Continued risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSO during rainfall events . Water quality throughout the study area would be at moderate risk Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) of deteriorating, from the implementation of the drought option, for Moderate adverse None dissolved oxygen, total ammonia and phosphate.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up levels and flows, including when this impacts on habitats to 67%), with an associated reduction in wetted width and depth and/or navigation. over a 19.9 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall minor to major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation abstractions (or compensation flow) to maintain water campaigns to promote efficient use of water to protect the supplies whilst protecting ecosystem functions that rely on environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial Water availability is less than 30% in the zone of influence of the drought option. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not N/A N/A N/A N/A N/A N/A result in any increases in emissions to atmosphere. None None

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought change. Plan. The Plan aims to ensure resilience of water supplies to drought Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions which may become more prevalent due to climate None Minor beneficial change. Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are a number of schedules ancient monuments in proximity to Heritage heritage assets and their settings and protect the impacted reaches of the drought option, however, they are not archaeologically important sites. N/A N/A N/A N/A N/A N/A water-dependent and would not be impacted by the drought option. None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the impacted reaches Amenity to designated and undesignated landscapes, townscapes would have a visual impact on the landscape setting of the and the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (beneficial) Calderdale Way National Trail. However, the reduced water levels of Minor adverse None the reaches would be short-term and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 11

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 11 from 3.41 Ml/d to 1.13 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 2.28 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and well- None Minor beneficial being. Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on the impacted health informal recreation. reaches. Due to the major reduction in water flows and levels Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) there would be a moderate adverse impact on the angling Moderate adverse None quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply for Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable designs eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial are envisaged. The option will make use of existing infrastructure.

One WwTW presents a significant water quality pressure in the impacted reaches. The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is Small Moderate Short-term Temporary Low (adverse) Medium (adverse) moderate for dissolved oxygen and ammonia. Moderate adverse None

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows levels and flows, including when this impacts on habitats (up to 67%), with an associated reduction in wetted width and and/or navigation. depth over a 21.1 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Major (adverse) Medium (adverse) reaches. Major adverse None

Overall minor to major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by water conservation abstractions (or compensation flow) to maintain water campaigns to promote efficient use of water to protect the supplies whilst protecting ecosystem functions that rely on environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial Water availability is less than 30% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A compensation flow. It is anticipated that there will be no None None impacts on geologically sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would N/A N/A N/A N/A N/A N/A therefore not result in any increases in emissions to None None atmosphere.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (adverse) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, One Scheduled Ancient Monument is not water-dependent and Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape setting of the countryside. the Calderdale Way National Trail. However, the reduced water Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None levels of the reaches would be short-term and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 12

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 12 from 5.90 Ml/d to 1.95 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. fauna The implementation of the drought option would lead to a N/A N/A N/A N/A N/A N/A reduction in flow and is therefore not anticipated to increase None None the spread of aquatic invasive non-native species.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 3.95 Ml/d helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and well- None Minor beneficial being.

Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on the impacted health informal recreation. reaches. Due to the major reduction in water flows and levels Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) there would be a moderate adverse impact on the angling Moderate adverse None quality of the reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply for Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable designs eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Ryburn watercourses were groundwater, estuarine and coastal waterbodies. considered in the assessment.

One WwTW and one fish farm present significant water quality pressures in the impacted reaches. Continued risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSO during rainfall events. The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is moderate for dissolved Small Moderate Short-term Temporary Low (adverse) Medium (adverse) oxygen and ammonia. Moderate adverse None

Overall there is a moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 67%), with an associated reduction in wetted width and/or navigation. and depth over a 7.6 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted Small Moderate Short-term Temporary Major (adverse) Medium (adverse) reaches. Major adverse None

Overall major impacts are anticipated towards river habitats associated with the drought option.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water-dependent and Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A would not be impacted by the drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape setting of the countryside. the Calderdale Way National Trail. However, the reduced water Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None levels of the reaches would be short-term and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area 13

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 13 from 6.82 Ml/d to 2.25 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of fauna designated sites of nature conservation interest and impacts on fish species including: the stranding of protected habitats and species (with particular regard to individuals or groups; deterioration or loss of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; fragmentation of habitats; increased climate change) and to protect and enhance natural capital mortality; and changes in morphology or behaviour. and the biodiversity and ecosystem services that As a result, NERC and Notable species would be contribute to the economy. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) subject to the following adverse impacts: Moderate adverse None Major impact for brown trout. Moderate impact for water vole. Minor impact for bullhead, grayling and barbel. There is a moderate risk of deterioration of WFD status (invertebrates and fish).

Population and human 2.1 To protect and improve health and well-being The drought option would deliver up to 4.57 Ml/d health (including promoting the value of the water environment helping to maintain essential public water supplies for health and wellbe ing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Cragg Brook. The health informal recreation. major flow reduction would have a minor adverse Small Moderate Short-term Temporary Medium (adverse) Low (adverse) impact on the angling quality of the brook. Minor adverse None

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) or sustainable designs are envisaged. The option will None Minor beneficial make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, management of natural resources have been ensuring water supply for homes and industry in the area N/A N/A N/A N/A N/A N/A None None identified for this option. is maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Cragg Brook and groundwater, estuarine and coastal waterbodies. River Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Due to the presence of consented discharges, water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) throughout the study area would be at moderate Moderate adverse None risk from the implementation of the drought option, for dissolved oxygen and total ammonia.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction levels and flows, including when this impacts on habitats in low flows (up to 67%), with an associated and/or navigation. reduction in wetted width and depth over a 20.5 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the Small Moderate Short-term Temporary Major (adverse) Medium (adverse) impacted reaches. Major adverse None

Overall minor to major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water abstractions (or compensation flow) to maintain water conservation campaigns to promote efficient use of supplies whilst protecting ecosystem functions that rely on water to protect the environment and safeguard water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term sustainable water use. N/A N/A N/A N/A N/A N/A improvement in water efficiency have been None None identified for this option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with soils and to protect and enhance geodiversity. reduced compensation flow. It is anticipated that N/A N/A N/A N/A N/A N/A there will be no impacts on geologically sensitive None None sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing N/A N/A N/A N/A N/A N/A abstraction volumes and would therefore not result None None in any increases in emissions to atmosphere.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the Amenity to designated and undesignated landscapes, townscapes impacted reaches would have a visual impact on the and the countryside. landscape setting of the Calderdale Way National Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Trail. However, the reduced water levels of the Minor adverse None reaches would be short-term and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 14

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 14 from 2.64 Ml/d to 0.87 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fauna designated sites of nature conservation interest and fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology climate change) and to protect and enhance natural capital or behaviour. As a result, NERC and Notable species would and the biodiversity and ecosystem services that contribute be subject to the following adverse impacts: to the economy. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for brown trout, white-clawed crayfish Moderate adverse None and water vole. Minor impact for bullhead. There is a moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 1.77 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Cragg Brook. The major informal recreation. health Small Moderate Short-term Temporary Medium (adverse) Low (adverse) flow reduction would have a minor adverse impact on the Minor adverse None angling quality of the brook. Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply communities with good access to the services they need. health Small High Short-term Temporary Low (beneficial) Medium (beneficial) reliability in drought conditions, ensuring a resilient supply None Minor beneficial for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Cragg Brook were groundwater, estuarine and coastal waterbodies. considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Water quality, including dissolved oxygen, Small Moderate Short-term Temporary Low (adverse) Medium (adverse) total ammonia, and phosphate concentrations, would be Moderate adverse None at moderate risk of deteriorating throughout the study area, from the implementation of the drought option.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 67%), with an associated reduction in wetted and/or navigation. width and depth over a 7.8 km stretch of the impacted reaches. Major hydrological impacts are anticipated Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) towards the impacted reaches. Moderate adverse None

Overall moderate to major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments are not water-dependent and heritage assets and their settings and protect Heritage N/A N/A N/A N/A N/A N/A would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape the countryside. setting of the Calderdale Way National Trail. However, the Small Moderate Short-term Temporary Low (adverse) Medium (adverse) reduced water levels of the reaches would be short-term Minor adverse None and temporary so the impact would only be minor. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 15

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 15 from 3.49 Ml/d to 1.15 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts fauna designated sites of nature conservation interest and on fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to of habitats; increased mortality; and changes in climate change) and to protect and enhance natural capital morphology or behaviour. As a result, NERC and and the biodiversity and ecosystem services that Notable species would be subject to the following contribute to the economy. adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Major impact for white-clawed crayfish, water vole, brown trout and European eel. Moderate impact for otter and bullhead. There is a major risk of deterioration of WFD status (fish) and moderate risk of deterioration of WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being The drought option would deliver up to 2.34 Ml/d health (including promoting the value of the water environment helping to maintain essential public water supplies for health and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help maintain None Minor beneficial public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on Black Brook. The health informal recreation. major reduction in water levels and flows would have a Small Moderate Short-term Temporary Medium (adverse) Low (adverse) minor adverse impact on the angling quality of the Minor adverse None reach.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient Small High Short-term Temporary Low (beneficial) Medium (beneficial) supply for customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use only and no changes to energy use, generated waste or and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) sustainable designs are envisaged. The option will make None Minor beneficial use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the Black Brook were groundwater, estuarine and coastal waterbodies. considered in the assessment.

Two WwTWs present significant water quality pressures in the impacted reaches. Continued risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSO during rainfall Small Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None events. The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is moderate for dissolved oxygen and ammonia.

Overall there is a moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in levels and flows, including when this impacts on habitats low flows, with an associated reduction in wetted width and/or navigation. and depth over a 8.9 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and towards two flow Small Moderate Short-term Temporary Major (adverse) Medium (adverse) depleted reaches. Major adverse None

Overall, major impacts are anticipated towards river habitats associated with the drought option.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes N/A N/A N/A N/A N/A N/A to greenhouse gas emissions are envisaged. None None

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions which Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial may become more prevalent due to climate change.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the Amenity to designated and undesignated landscapes, townscapes impacted reaches would have a visual impact on the and the countryside. landscape setting of the Calderdale National Trail. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None However, the reduced water levels of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 16

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 16 from 1.36 Ml/d to 0.45 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fauna designated sites of nature conservation interest and fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology climate change) and to protect and enhance natural capital or behaviour. As a result, NERC and Notable species would and the biodiversity and ecosystem services that contribute be subject to the following adverse impacts: to the economy. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for water vole, otter and white-clawed Moderate adverse None crayfish There is a moderate risk of deterioration of WFD status (invertebrates) and a negligible risk to WFD status (fish).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 0.91 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There are no opportunities or threats to formal or health informal recreation. N/A N/A N/A N/A N/A N/A informal recreation. None None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, ensuring management of natural resources have been identified water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None for this option. maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne were groundwater, estuarine and coastal waterbodies. considered in the assessment.

The risk of water quality deterioration below what supports good WFD status for fish and invertebrates is minor for dissolved oxygen, ammonia and phosphate. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None Overall there is a minor risk to water quality as a result of the drought option.

Overall, major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience Small High Short-term Temporary Low (beneficial) Medium (beneficial) of water supplies to drought conditions which may None Minor beneficial become more prevalent due to climate change.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no landscape designations in proximity to the designated and undesignated landscapes, townscapes and Amenity N/A N/A N/A N/A N/A N/A impacted reaches of the drought option. None None the countryside. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 17

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 17 from 3.48-9.09 Ml/d to 1.16 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The overall risk to water quality and aquatic habitats on fauna designated sites of nature conservation interest and the canal from the drought option is assessed as negligible protected habitats and species (with particular regard to and as such aquatic communities including fish and avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to invertebrates are not considered sensitive to drought climate change) and to protect and enhance natural capital Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) option implementation. Negligible adverse Negligible beneficial and the biodiversity and ecosystem services that contribute The reduced flows and potential for decreased boat traffic to the economy. in the canal may result in a positive impact on macrophytes including floating water plantain (Luronium natans ). Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for fauna dispersal. The implementation of the drought option would lead to a reduction in flow and is therefore not N/A N/A N/A N/A N/A N/A None None anticipated to increase the spread of aquatic invasive non- native species.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 7.94 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) High (beneficial) conditions, and therefore help maintain public health and None well-being. Minor beneficial Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the Huddersfield Canal. health informal recreation. The drought option would have a minor adverse impact Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Minor adverse None on the angling quality.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply communities with good access to the services they need. health Small High Short-term Temporary Low (beneficial) Medium (beneficial) reliability in drought conditions, ensuring a resilient supply None Minor beneficial for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management resource use the sustainable management of natural resources, ensuring of natural resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Effects towards the following waterbodies were groundwater, estuarine and coastal waterbodies. considered in the assessment: -Huddersfield Narrow Canal -Huddersfield Broad Canal

Although the Huddersfield Narrow Canal is an artificial waterbody, water quality is generally very good. The risk Small Moderate Short-term Temporary Low (adverse) Low (adverse) of water quality deterioration below what supports good Minor adverse None WFD status for fish and invertebrates is minor for dissolved oxygen, ammonia and phosphate.

Overall, there is a minor risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 87%), with an associated reduction in wetted and/or navigation. width and depth over a 37.9 km stretch of the Huddersfield Narrow Canal (HNC). The reduced water level would make the canal non-navigable for canal boats. However, this impact would be short-term and temporary. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major hydrological impacts are anticipated towards the Major adverse None impacted reaches of the HNC.

Negligible impacts are anticipated towards river habitats of the HNC. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought conditions which may Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, One Scheduled Ancient Monument is not water- Heritage heritage assets and their settings and protect dependent and would not be impacted by the drought archaeologically important sites. N/A N/A N/A N/A N/A N/A option. None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape the countryside. setting of the Kirklees Way and Pennine Way National Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Trails. However, the reduced water levels of the reaches Minor adverse None would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 18

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 18 from 8.07 Ml/d to 2.66 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fauna designated sites of nature conservation interest and fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; increased mortality; and changes in morphology climate change) and to protect and enhance natural capital or behaviour. As a result, NERC and Notable species would and the biodiversity and ecosystem services that contribute be subject to the following adverse impacts: to the economy. Major impact for white-clawed crayfish and brown trout. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for otter, water vole, grayling, bullhead, Moderate adverse None European eel, river lamprey and brook lamprey. Minor impact for barbel. There is a major risk of deterioration of WFD status (fish) and moderate to WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 5.41 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during drought and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, and therefore help maintain public health and None Minor beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on the River health informal recreation. Colne. The reduction in flows and water levels would have Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) a moderate adverse impact on the angling club. Moderate adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply health communities with good access to the services they need. reliability in drought conditions, ensuring a resilient supply Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves modifications to compensation flow only and no minimise the generation of waste, encourage its re-use and changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne and groundwater, estuarine and coastal waterbodies. Wessenden Brook and River Calder were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Therefore, the water quality Small Moderate Short-term Temporary Low (adverse) Medium deterioration risk imposed by the implementation of the Minor adverse None drought option would be moderate for total ammonia and oxygen, and minor for phosphate, due to consented discharges.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low levels and flows, including when this impacts on habitats flows (up to 67%), with an associated reduction in wetted and/or navigation. width and depth over a 77.6 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the impacted reaches and towards six flow depleted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall, minor to major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by water abstractions (or compensation flow) to maintain water conservation campaigns to promote efficient use of water supplies whilst protecting ecosystem functions that rely on to protect the environment and safeguard supplies. water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) Water availability is less than 30% in the zone of influence None Minor beneficial of the drought option.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought conditions which may become more None Minor beneficial prevalent due to climate change.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to A significant reduction in the water level of the impacted Amenity designated and undesignated landscapes, townscapes and reaches would have a visual impact on the landscape the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) setting of the Kirklees Way National Trail. However, the Minor adverse None reduced water levels of the reaches would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 19

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 19 from 7.27 Ml/d to 2.40 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fish species fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; deterioration or loss protected habitats and species (with particular regard to of habitats; fragmentation of habitats; increased mortality; and avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to changes in morphology or behaviour. As a result, NERC and Notable climate change) and to protect and enhance natural capital species would be subject to the following adverse impacts: and the biodiversity and ecosystem services that contribute Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Major impact for brown trout. Moderate adverse None to the economy. Moderate impact for otter, bullhead, water vole, bullhead, grayling, European eel and white-clawed crayfish. There is a major risk of deterioration of WFD status (fish) and moderate risk to WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 4.87 Ml/d helping to maintain health promoting the value of the water environment for health essential public water supplies during drought conditions, and and wellbeing). Small High Short-term Temporary Low (beneficial) Medium (beneficial) therefore help maintain public health and well-being. None Minor beneficial

Population and human 2.2 To protect and enhance opportunities for formal and There is an organised angling club present on the River Colne. The health informal recreation. reduction in flows and water levels would have a moderate adverse Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None impact on the angling club.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, modifications to compensation flow only and no changes to energy minimise the generation of waste, encourage its re-use and Small High Short-term Temporary Low (beneficial) Medium (beneficial) use, generated waste or sustainable designs are envisaged. The option None Minor beneficial eliminate waste sent to landfill. will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne and River Calder were groundwater, estuarine and coastal waterbodies. considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. The risk of water Small Moderate Short-term Temporary Low (adverse) Medium (adverse) quality deterioration below what supports good WFD status for fish Minor adverse None and invertebrates is moderate for dissolved oxygen and ammonia, and minor phosphate.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up to levels and flows, including when this impacts on habitats 67%), with an associated reduction in wetted width and depth over a and/or navigation. 77.3 km stretch of the impacted reaches. Moderate to major hydrological impacts are anticipated towards the impacted reaches Small Moderate Short-term Temporary Major (adverse) Medium (adverse) and towards four flow depleted reaches. Major adverse None

Overall, minor to major impacts are anticipated towards river habitats associated with the drought option.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced compensation and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A flow. It is anticipated that there will be no impacts on geologically None None sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change in existing abstraction volumes and would therefore not result N/A N/A N/A N/A N/A N/A None None in any increases in emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy N/A N/A N/A N/A N/A N/A consumption, therefore, no changes to greenhouse gas emissions are None None envisaged.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets in proximity to the impacted of the Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the water level of the impacted reaches Amenity to designated and undesignated landscapes, townscapes would have a visual impact on the landscape setting of the Kirklees and the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) Way National Trail. However, the reduced water levels of the reaches Minor adverse None would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: South West Area 20

Drought Plan Option Description: Reduced compensation flow release fromSouth West Area Reservoir 20 from 2.66 Ml/d to 0.88 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts on fish species fauna designated sites of nature conservation interest and including: the stranding of individuals or groups; deterioration or loss of protected habitats and species (with particular regard to habitats; fragmentation of habitats; increased mortality; and changes in avoiding the effects of over-abstraction on sensitive sites, habitats and species) and consider adaptability to climate morphology or behaviour. As a result, NERC and Notable species would be change. subject to the following adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Major impact for brown trout. Moderate adverse None Moderate impact for white-clawed crayfish, otter, water vole, bullhead and grayling. There is a moderate risk of deterioration of WFD status for fish and invertebrates.

Population and human 2.1 To protect and improve health and well-being and reduce The drought option would deliver up to 1.78 Ml/d helping to maintain inequalities health Small High Short-term Temporary Low (beneficial) Medium (beneficial) essential public water supplies during drought conditions, and therefore help None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is casual angling present on the impacted reaches. The reduced flows informal recreation. health Small Moderate Short-term Temporary Low (adverse) Medium (adverse) would have a minor adverse impact on the angling quality of the reach. Minor adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in drought communities with good access to the services they need. health Small High Short-term Temporary Low (beneficial) Medium (beneficial) conditions, ensuring a resilient supply for customers and economic activity. None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, modifications to compensation flow only and no changes to energy use, minimise the generation of waste, encourage its re-use and generated waste or sustainable designs are envisaged. The option will make eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne and River Holme were considered groundwater, estuarine and coastal waterbodies. in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSO during rainfall events. The risk of water quality deterioration below Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) what supports good WFD status for fish and invertebrates is moderate for Moderate adverse None dissolved oxygen, ammonia and phosphate.

Overall there is a minor to moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in low flows (up to 67%), levels and flows, including when this impacts on habitats with an associated reduction in wetted width and depth over a 18.5 km stretch and/or navigation. of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and towards four flow depleted reaches. Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None Overall, major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation campaigns to water supplies whilst protecting ecosystem functions that promote efficient use of water to protect the environment and safeguard rely on water resources including contributing to the supplies. achievement of WFD objectives Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Water availability is at least 70% in the zone of influence of the drought option. Minor beneficial Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with reduced compensation flow. It and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A is anticipated that there will be no impacts on geologically sensitive sites. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves a reduction in compensation flow with no change N/A N/A N/A N/A N/A N/A in existing abstraction volumes and would therefore not result in any increases None None in emissions to atmosphere. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an increase in energy consumption, therefore, no changes to greenhouse gas emissions are N/A N/A N/A N/A N/A N/A None None envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought Plan. The change. Plan aims to ensure resilience of water supplies to drought conditions which Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are a number of Scheduled Ancient Monuments in proximity to the Heritage heritage assets and their settings and protect impacted reaches, however, they are not water-dependent and would not be archaeologically important sites. N/A N/A N/A N/A N/A N/A None None impacted by the drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no designated landscapes in proximity to the impacted reaches of Amenity designated and undesignated landscapes, townscapes and N/A N/A N/A N/A N/A N/A the drought option. None None the countryside. Part 1 of 2

Drought Plan Option Name: South West Area 21

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 21 from 0.61 Ml/d to 0.20 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of impacts fauna designated sites of nature conservation interest and on fish species including: the stranding of individuals or protected habitats and species (with particular regard to groups; deterioration or loss of habitats; fragmentation avoiding the effects of over-abstraction on sensitive sites, habitats and species) and consider adaptability to climate of habitats; increased mortality; and changes in change. morphology or behaviour. As a result, NERC and Notable species would be subject to the following adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Major impact for brown trout. Moderate impact for white-clawed crayfish, otter, water vole, bullhead and grayling. There is a major risk of deterioration of WFD status (fish) and moderate risk to WFD status (invertebrates).

Population and human 2.1 To protect and improve health and well-being and The drought option would deliver up to 0.41 Ml/d health reduce inequalities helping to maintain essential public water supplies Small High Short-term Temporary Low (beneficial) Medium (beneficial) during drought conditions, and therefore help maintain None Minor beneficial public health and well-being. Population and human 2.2 To protect and enhance opportunities for formal and There are no opportunities or threats for recreation health informal recreation. N/A N/A N/A N/A N/A N/A associated with this drought option. None None Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply communities with good access to the services they need. health Small High Short-term Temporary Low (beneficial) Medium (beneficial) reliability in drought conditions, ensuring a resilient None Minor beneficial supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow only minimise the generation of waste, encourage its re-use and no changes to energy use, generated waste or and eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial sustainable designs are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne and River groundwater, estuarine and coastal waterbodies. Holme were considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Due to downstream locally consented discharges, the risk of water quality Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None deterioration below what supports good WFD status for fish and invertebrates is moderate for dissolved oxygen, ammonia and phosphate.

Overall there is a moderate risk to water quality as a result of the drought option.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major reduction in levels and flows, including when this impacts on habitats low flows (up to 67%), with an associated reduction in and/or navigation. wetted width and depth over a 20.2 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards the impacted reaches and towards Small Moderate Short-term Temporary Major (adverse) Medium (adverse) Major adverse None six flow depleted reaches.

Overall, major impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water water supplies whilst protecting ecosystem functions that conservation campaigns to promote efficient use of rely on water resources including contributing to the water to protect the environment and safeguard achievement of WFD objectives Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option. Soil, geology and land use 5.1 To protect and enhance the quality and quantity of There are no land use changes associated with reduced soils and to protect and enhance geodiversity. compensation flow. It is anticipated that there will be no N/A N/A N/A N/A N/A N/A impacts on geologically sensitive sites. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option would not be associated with an N/A N/A N/A N/A N/A N/A increase in energy consumption, therefore, no changes None None to greenhouse gas emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire change. Water's Drought Plan. The Plan aims to ensure resilience Small High Short-term Temporary Low (beneficial) Medium of water supplies to drought conditions which may None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage in proximity to the impacted Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A reaches of the drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in proximity to the Amenity to designated and undesignated landscapes, townscapes N/A N/A N/A N/A N/A N/A impacted reaches of the drought option. None None and the countryside. Part 1 of 2

Drought Plan Option Name: South West Area Reservoir 22

Drought Plan Option Description: Reduced compensation flow release from South West Area Reservoir 22 from 1.40 Ml/d to 0.46 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The reduced flows would result in a number of fauna designated sites of nature conservation interest and impacts on fish species including: the stranding of protected habitats and species (with particular regard to individuals or groups; deterioration or loss of avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to habitats; fragmentation of habitats; increased climate change) and to protect and enhance natural capital mortality; and changes in morphology or and the biodiversity and ecosystem services that contribute behaviour. As a result, NERC and Notable species to the economy. would be subject to the following adverse impacts: Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Major impact for brown trout. Moderate impact for white-clawed crayfish, otter. water vole, grayling and bullhead. There is a moderate risk of deterioration of WFD status (fish and invertebrates).

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 0.94 Ml/d health promoting the value of the water environment for health helping to maintain essential public water supplies and wellbeing). during drought conditions, and therefore help Small High Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and There is unlikely that any angling activities take health informal recreation. N/A N/A N/A N/A N/A N/A place on the impacted reaches. None None Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a Small High Short-term Temporary Low (beneficial) Medium (beneficial) resilient supply for customers and economic None Minor beneficial activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves modifications to compensation flow minimise the generation of waste, encourage its re-use and only and no changes to energy use, generated eliminate waste sent to landfill. Small High Short-term Temporary Low (beneficial) Medium (beneficial) waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable resource use the sustainable management of natural resources, ensuring management of natural resources have been water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None identified for this option. maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Colne were groundwater, estuarine and coastal waterbodies. considered in the assessment.

Risk of short term acute, infrequent, temporary water quality pressures (acute toxicity of ammonia, suffocation from oxygen sags) locally downstream of listed CSOs during rainfall events. Due to downstream locally consented discharges, the risk Small Moderate Short-term Temporary Low (adverse) Medium (adverse) of water quality deteriorating from the Minor adverse None implementation of the drought option is uncertain but assumed to be moderate for total ammonia and oxygen, and phosphate.

Overall there is a minor to moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a major levels and flows, including when this impacts on habitats reduction in low flows (up to 67%), with an and/or navigation. associated reduction in wetted width and depth over a 21.1 km stretch of the impacted reaches. Major hydrological impacts are anticipated towards Small Moderate Short-term Temporary Major (adverse) Medium (adverse) the impacted reaches and towards six flow Major adverse None depleted reaches.

Overall, moderate to major impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought permit will be accompanied by water abstractions (or compensation flow) to maintain water conservation campaigns to promote efficient use of supplies whilst protecting ecosystem functions that rely on water to protect the environment and safeguard water resources. Small High Short-term Temporary Low (beneficial) Medium (beneficial) supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage in proximity to the impacted Heritage heritage assets and their settings and protect N/A N/A N/A N/A N/A N/A reaches of the drought option. None None archaeologically important sites. Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no designated landscapes in proximity to Amenity designated and undesignated landscapes, townscapes and N/A N/A N/A N/A N/A N/A the impacted reaches of the drought option. None None the countryside. Part 1 of 2

Drought Option Name: Ouse increased abstraction

Drought Plan Option Description: The drought option involves an increased abstraction volume from the Ouse increased abstraction where an abstraction permit is currently in operation. The option would provide a benefit of up to 60 Ml/d dependent on flows in the river.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Risks to 4 SSSI's have been assessed as negligible. fauna designated sites of nature conservation interest and The drought option will impact wetted width, especially in protected habitats and species (with particular regard to shallow areas of the channel, potentially reducing habitat avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to availability. The drought option is assessed as having a moderate climate change) and to protect and enhance natural capital impact on the following NERC species and notable species due to and the biodiversity and ecosystem services that contribute siltation of spawning gravels, exposure of habitat: to the economy. Moderate impact for water vole, sea lamprey and brook lamprey. Minor impact for river lamprey. Large Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None There is a minor risk of deterioration of WFD status (macroinvertebrates and fish).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow in the watercourse for dispersal. fauna Implementation of the drought option will lead to a reduction in N/A N/A N/A N/A N/A N/A flow, and is therefore not anticipated to increase the spread of None None aquatic invasive non-native species. Population and human 2.1 To protect and improve health and well-being (including The drought option would provide up to 60 Ml/d, helping to health promoting the value of the water environment for health maintain essential public water supplies during drought and wellbeing). Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) conditions, and will therefore help maintain public health and None Major beneficial well being. Population and human 2.2 To protect and enhance opportunities for formal and The drought option would only cause a minor reduction in flow, health informal recreation therefore recreational activities such as angling are unlikely to be Large Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None impacted.

Population and human 2.3 To promote a sustainable economy and thriving The drought option would contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a resilient Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) None Major beneficial supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No adverse impacts on material assets are anticipated. The resource use industrial and commercial consumption of resources, option involves relatively minor modifications to abstraction minimise the generation of waste, encourage its re-use and volumes only and no significant changes to energy use, eliminate waste sent to landfill. Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) generated waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of resource use the sustainable management of natural resources, ensuring natural resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards the River Ouse. groundwater, estuarine and coastal waterbodies. There is a moderate risk that the drought option flow reduction would reduce the downstream dissolved oxygen saturation and total ammonia concentrations below values which support ‘good’ or ‘high’ status for fish and invertebrates. Overall there is a moderate risk to water quality as a result of the Large Moderate Short-term Temporary Low (adverse) Low (adverse) Moderate adverse None drought option associated with intermittent water quality pressures in the reach. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a minor reduction in low flows levels and flows, including when this impacts on habitats (up to 14%), with associated reduction in wetted width and and/or navigation. depth over 20.6 km of the River Ouse. The drought option would not impact on the moderate to high flow regime in the receiving watercourses. There are two localised flow pressures in the Large Moderate Short-term Temporary Low (adverse) Medium (adverse) upper reach, which collectively are assessed as having a minor Minor adverse None impact when the drought option is operated. Overall minor adverse impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable management of The drought option will contribute to the maintenance of supply abstractions (or compensation flow) to maintain water reliability in drought conditions, ensuring a resilient supply for supplies whilst protecting ecosystem functions that rely on customers and economic activity. water resources. The drought option will be accompanied by water conservation Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) campaigns to promote efficient use of water to protect the None Minor beneficial environment and safeguard supplies. Water availability is at least 50% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with the and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A implementation of the drought option. It is anticipated that there None None will be no impacts on geologically sensitive sites.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves only minor modifications to N/A N/A N/A N/A N/A N/A abstraction volumes, and would therefore not result in any None None significant increases in emissions to atmosphere. Air and climate 6.2 To reduce greenhouse gas emissions. The increase in abstraction volumes would be associated with a negligible change in energy use, and therefore no significant Large Moderate Short-term Temporary Low (adverse) Low (adverse) increase in greenhouse gas emissions are envisaged. The use of Negligible adverse None existing infrastructure will minimise increases in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought, which may become more prevalent due to None Minor beneficial climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not water- Heritage heritage assets and their settings and protect dependent, and would not be impacted by the drought option. archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access The potential impact on the landscape setting of the numerous Amenity to designated and undesignated landscapes, townscapes SSSIs adjacent to the impacted reaches has been assessed as and the countryside. Large Moderate Short-term Temporary Low (adverse) Medium (adverse) minor, as the level of flow reduction would be short-term and Minor adverse None not easily perceptible. Part 1 of 2

Drought Plan Option Name: Ure increased abstraction

Drought Plan Option Description: The drought option involves an increased abstraction volume from the Ure increased abstraction where an abstraction permit is currently in operation. The option would provide a benefit of up to 3.27 Ml/d dependent on flow levels in the river.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, The drought option will impact wetted width, especially in shallow fauna including designated sites of nature areas of the channel, potentially reducing habitat availability. The conservation interest and protected habitats drought option is assessed as having a moderate impact on the and species (with particular regard to avoiding following NERC and notable species due to siltation of spawning the effects of over-abstraction on sensitive sites, gravels and exposure of habitat: habitats and species and consideration of Major impact for Atlantic salmon, European eel and river lamprey. adaptability to climate change) and to protect Small Low Short-term Temporary Medium (adverse) Medium (adverse) Moderate impact for water vole, barbel, brook lamprey, brown Moderate adverse None and enhance natural capital and the biodiversity trout, bullhead, grayling, fine-lined pea mussel and Rhyacophila and ecosystem services that contribute to the fasciata . economy. The risk of deterioration of WFD status has been assessed as moderate (fish and invertebrates).

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive non-native species have been identified in the impacted fauna reaches. The potential hydrological changes associated with the drought option are not expected to increase the spread of Oncorhynchus mykiss, Himalayan balsam (Impatiens glandulifera ) and Japanese knotweed (Fallopia japonica ). Based on the expected changes in hydrology and water quality there is a risk that freshwater shrimp (Crangonyx pseudogracilis) abundances will Small Moderate Short-term Temporary Low (adverse) Low (adverse) increase if the native freshwater gammarid populations decrease Negligible adverse None as a result of the drought option. However, the impact on gammarid populations is expected to be short-term and as such the proliferation of the invasive freshwater shrimp is expected to be short-term and of low magnitude.

Population and human 2.1 To protect and improve health and well- The drought option would deliver 3.27 Ml/d, helping to maintain health being (including promoting the value of the essential public water supplies during drought conditions, and water environment for health and wellbeing). Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) therefore help maintain public health and well being. None Minor beneficial

Population and human 2.2 To protect and enhance opportunities for The Ure increased abstraction supports a high density of salmon health formal and informal recreation and is considered to be important for anglers. The impact of the Small Moderate Short-term Temporary Low (adverse) Medium (adverse) drought option is assessed as minor and alternative angling Minor adverse None locations would be available during the implementation of the drought.

Population and human 2.3 To promote a sustainable economy and The drought option will contribute to the maintenance of supply health thriving communities with good access to the reliability in drought conditions, ensuring a resilient supply for Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial services they need. customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the No impacts on material assets are anticipated. The option involves resource use domestic, industrial and commercial relatively minor modifications to abstraction volumes only and no consumption of resources, minimise the significant changes to energy use, generated waste or sustainable Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial generation of waste, encourage its re-use and designs are envisaged. The option will make use of existing eliminate waste sent to landfill. infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of the sustainable management of natural resources, ensuring resource use N/A N/A N/A N/A N/A N/A natural resources have been identified for this option. None None water supply for homes and industry in the area is maintained. Water 4.1 To maintain or improve the quality of rivers, The River Ure watercourse was considered in the assessme. lakes, groundwater, estuarine and coastal The risk of water quality deterioration is assessed as moderate for waterbodies. dissolved oxygen and total ammonia, and minor for phosphate, due to downstream locally consented discharges. Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None Overall there is a moderate risk to water quality as a result of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.2 To avoid adverse impact on surface and The drought option would lead to a moderate reduction in low groundwater levels and flows, including when flows (up to 9.8%), with associated reduction in wetted width and this impacts on habitats and/or navigation. depth over a 10.6 km stretch of the River Ure. Moderate hydrological impacts are anticipated towards the impacted reaches. The drought option would not impact on the moderate to Small Moderate Short-term Temporary Medium (adverse) Medium (adverse) high flow regime in the receiving watercourses. Moderate adverse None

Overall moderate impacts are anticipated towards river habitats associated with the drought option.

Water 4.3 To ensure appropriate and sustainable The drought option will contribute to the maintenance of supply management of abstractions (or compensation reliability in drought conditions, ensuring a resilient supply for flow) to maintain water supplies whilst customers and economic activity. protecting ecosystem functions that rely on The drought option will be accompanied by water conservation water resources. Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) campaigns to promote efficient use of water to protect the None Minor beneficial environment and safeguard supplies. Water availability is at least 50% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and There are no land use changes associated with the implementation quantity of soils and to protect and enhance of the drought option. It is anticipated that there will be no impacts geodiversity. N/A N/A N/A N/A N/A N/A on geologically sensitive sites. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves minor modifications to abstraction N/A N/A N/A N/A N/A N/A volumes and would therefore not result in any significant increases None None in emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. Increase in abstraction volumes would be associated with a negligible change in energy use and therefore no significant Small Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None increase in greenhouse gas emissions are envisaged.

Air and climate 6.3 To consider the need for adaptive measures Drought options are a key component of Yorkshire Water's Drought for climate change. Plan. The Plan aims to ensure resilience of water supplies to Small Moderate Short-term Temporary Low (beneficial) Medium (beneficial) drought which may become more prevalent due to climate change. None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic Nearby ancient monuments and heritage sites are not water- Heritage environment, heritage assets and their settings dependent, and would not be impacted by the drought option. and protect archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and The Ripon Rowel Walk National trails runs alongside the River Ure Amenity improve access to designated and undesignated and forms part of the Nidderdale AONB. However, the flow level landscapes, townscapes and the countryside. Small Moderate Short-term Temporary Low (adverse) Medium (adverse) reduction under drought conditions would not be perceptible. Minor adverse None Part 1 of 2

Drought Plan Option Name: Wharfe increased abstraction

Drought Plan Option Description: The drought option involves an increased abstraction volume from the River Wharfe where an abstraction permit is currently in operation. The option would provide a benefit of up to 22.70 Ml/d dependent on flow levels in the river.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The drought option will impact wetted width, especially in shallow fauna designated sites of nature conservation interest and areas of the channel, potentially reducing habitat availability. The protected habitats and species (with particular regard to drought option is assessed as having a moderate impact on the avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to following NERC species and notable species due to siltation of climate change) and to protect and enhance natural capital spawning gravels and exposure of habitat: and the biodiversity and ecosystem services that contribute Moderate risk for water vole, Atlantic salmon, brown trout, river to the economy. Large Low Short-term Temporary Medium (adverse) Medium (adverse) lamprey and brook lamprey. Moderate adverse None Minor risk for European eel, barbel, bullhead and grayling. The risk of deterioration of WFD status regarding fish has been assessed as minor and moderate for invertebrates. The impact to River Wharfe, Otley & Mid Wharfedale/ Wetherby LWS is assessed as minor.

Population and human 2.1 To protect and improve health and well-being (including The drought option would provide 22.70 Ml/d helping to maintain health promoting the value of the water environment for health essential public water supplies during drought conditions, and and wellbeing). Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) therefore help maintain public health and well-being. None Major beneficial

Population and human 2.2 To protect and enhance opportunities for formal and The drought option would only cause a minor reduction in flow, informal recreation. health Large Moderate Short-term Temporary Low (adverse) Low (adverse) therefore recreational activities such as angling are unlikely to be Negligible adverse None impacted.

Population and human 2.3 To promote a sustainable economy and thriving The drought option will contribute to the maintenance of supply communities with good access to the services they need. health Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) reliability in drought conditions, ensuring a resilient supply for None Major beneficial customers and economic activity. Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, relatively minor modifications to abstraction volumes only and no minimise the generation of waste, encourage its re-use and significant changes to energy use, generated waste or sustainable eliminate waste sent to landfill. Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial designs are envisaged. The option will make use of existing infrastructure.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Wharfe were considered in the groundwater, estuarine and coastal waterbodies. assessment. Water quality throughout the study area is assessed as moderate risk of deteriorating with regards to total ammonia and medium risk for dissolved oxygen and minor for phosphate. This risk may increase Large Moderate Short-term Temporary Medium (adverse) Medium (adverse) locally, downstream of consented water quality pressures. There are Moderate adverse None several water quality pressures within the reach, including one WwTW. Overall the risk to water quality is assessed as moderate.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would lead to a moderate reduction in low flows levels and flows, including when this impacts on habitats (up to 18%), with associated reduction in wetted width and depth and/or navigation. over 68.4 km of the River Wharfe. The drought option would not impact on the moderate to high flow regime in the receiving watercourses. Impacted reaches are navigable from Tadcaster to Large Moderate Short-term Temporary Moderate (adverse) Medium (adverse) confluence with Ouse, however the drought option unlikely to affect Moderate adverse None river levels on this stretch, most of which is tidal. Overall moderate impacts are anticipated towards river habitats associated with the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option would contribute to the maintenance of supply abstractions (or compensation flow) to maintain water reliability in drought conditions, ensuring a resilient supply for supplies whilst protecting ecosystem functions that rely on customers and economic activity. water resources. The drought option will be accompanied by water conservation Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) campaigns to promote efficient use of water to protect the None Minor beneficial environment and safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with the implementation of and to protect and enhance geodiversity. the drought option. It is anticipated that there will be no impacts on Large Moderate Short-term Temporary N/A N/A None None geologically sensitive sites.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves minor modifications to abstraction volumes and would therefore not result in any significant increases in N/A N/A N/A N/A N/A N/A None None emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The increase in abstraction volumes would be associated with a negligible change in energy use and therefore no significant increase N/A N/A N/A N/A N/A N/A in greenhouse gas emissions are envisaged. The use of existing None None infrastructure will minimise increases in greenhouse gas emissions.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not water- heritage assets and their settings and protect Heritage N/A N/A N/A N/A N/A N/A dependent, and would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of the River Wharfe will have a Amenity to designated and undesignated landscapes, townscapes visual impact on the Nidderdale AONB. However, there is limited and the countryside. Large Moderate Short-term Temporary Low (adverse) Medium (adverse) Minor adverse None access to the impacted reach with no national trails. Part 1 of 2

Drought Plan Option Name: The River Wharfe annual abstraction increase

Drought Plan Option Description: The drought option involves an increase in the annual abstraction volume from the River Wharfe where an abstraction permit is currently in operation. This option will not change the daily licence limits. The benefit of the option will depend on when permission is granted, as it is related to the number of days left in the licensing year.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The impact to one SSSI (a meandering section of the River fauna designated sites of nature conservation interest and Wharfe providing valuable invertebrate habitat) has been protected habitats and species (with particular regard to assessed as negligible. avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to The drought option has been assessed as having a climate change) and to protect and enhance natural capital negligible impact on river flow and level. The drought and the biodiversity and ecosystem services that contribute option is assessed as having a negligible impact on the to the economy. Large Low Short-term Temporary Low (adverse) Low (adverse) NERC species and notable species: Negligible adverse None brown trout, Atlantic salmon, white clawed crayfish, otter and water vole. The risk of deterioration of WFD status regarding invertebrates has been assessed as negligible.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for fauna dispersal. The implementation of the drought option will N/A N/A N/A N/A N/A N/A lead to a negligible reduction in flow, and is therefore not None None anticipated to increase the spread of aquatic invasive non- native species. Population and human 2.1 To protect and improve health and well-being (including The drought option would help to maintain essential public health promoting the value of the water environment for health water supplies during drought conditions, and therefore and wellbeing). Large Moderate Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial help maintain public health and well-being.

Population and human 2.2 To protect and enhance opportunities for formal and The drought option would only cause a negligible reduction health informal recreation. in flow, therefore recreational activities such as angling will Large Moderate Short-term Temporary Low (adverse) Low (adverse) None None not be impacted.

Population and human 2.3 To promote a sustainable economy and thriving The drought option will contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a resilient Large Moderate Short-term Temporary Medium (beneficial) Medium (beneficial) supply for customers and economic activity. None Moderate beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option resource use industrial and commercial consumption of resources, involves relatively minor modifications to abstraction minimise the generation of waste, encourage its re-use and volumes only and no significant changes to energy use, eliminate waste sent to landfill. Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) generated waste or sustainable designs are envisaged. The None Minor beneficial option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management resource use the sustainable management of natural resources, ensuring of natural resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, The River Wharfe has been considered in the assessment. groundwater, estuarine and coastal waterbodies. Water quality throughout the study area is assessed as Large Moderate Short-term Temporary Low (adverse) Low (adverse) negligible risk of deteriorating. Negligible adverse None

Water 4.2 To avoid adverse impact on surface and groundwater The drought option is assessed as having a negligible levels and flows, including when this impacts on habitats impact on river flow. The reduction in daily average flows and/or navigation. (assessed as up to 23.6Ml/d and would be confirmed at time of application) at moderate river flow conditions is no greater than a 5% effect, at high flows this is considerably Large Moderate Short-term Temporary Low (adverse) Low (adverse) less and there would be no impact on low flows. The Negligible adverse None drought permit would be implemented for a duration of up to 3 months during the period January to March. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable management of The drought option would contribute to the maintenance abstractions (or compensation flow) to maintain water of supply reliability in drought conditions, ensuring a supplies whilst protecting ecosystem functions that rely on resilient supply for customers and economic activity. water resources. The drought option will be accompanied by water Large Moderate Short-term Temporary Low (adverse) Low (beneficial) conservation campaigns to promote efficient use of water None None to protect the environment and safeguard supplies.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with the and to protect and enhance geodiversity. implementation of the drought option. It is anticipated that Large Moderate Short-term Temporary N/A N/A there will be no impacts on geologically sensitive sites. None None

Air and Climate 6.1 To maintain and improve air quality. The drought option involves minor modifications to abstraction volumes and would therefore not result in any N/A N/A N/A N/A N/A N/A None None significant increases in emissions to atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The increase in abstraction volumes would be associated with a negligible change in energy use and therefore no significant increase in greenhouse gas emissions are N/A N/A N/A N/A N/A N/A envisaged. The use of existing infrastructure will minimise None None increases in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) supplies to drought which may become more prevalent due None Minor beneficial to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not Heritage heritage assets and their settings and protect water-dependent, and would not be impacted by the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None drought option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to The drought option would result in a negligible reduction in Amenity designated and undesignated landscapes, townscapes and the level of the River Wharfe, which will have a negligible the countryside. Large Moderate Short-term Temporary Low (adverse) Low (adverse) visual impact on the Nidderdale AONB. However, there is Negligible adverse None limited access to the impacted reach with no national trails. Part 1 of 2

Drought Plan Option Name: Hull increased abstraction

Drought Plan Option Description: The drought option involves a lowering of the Hands Off Flow of an existing abstraction licence that is currently in operation on the Hull increased abstraction. The option would provide a benefit of up to 20 Ml/d dependent on flow levels in the river. The option involves no contruction activities or material change in the operation of the abstraction facility.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, One SSSI provides habitat for breeding birds (reed bunting, reed and sedge fauna including designated sites of nature conservation warblers). However, the fen is not river-water fed, but is supplied by springs that interest and protected habitats and species (with emerge in the valley. Reductions in freshwater flow associated with this option particular regard to avoiding the effects of over- are not considered to result in likely significant effects on the Humber Estuary abstraction on sensitive sites, habitats and SAC/SPA/SSSI. Impacts to two other SSSI/LWS's are also considered negligible. species and consideration of adaptability to The drought option is assessed as having an impact on the following NERC and climate change) and to protect and enhance Notable species due to mortality as a result of water quality deterioration natural capital and the biodiversity and Large Low Short-term Temporary Medium (adverse) Medium (adverse) (oxygen stress, gill clogging): Moderate adverse None ecosystem services that contribute to the Moderate impact risk for brook lamprey, brown trout, European eel, barbel, economy. grayling, bullhead and river lamprey. There is a moderate risk of deterioration of WFD status for fish and a minor risk of deterioration for invertebrates.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species utilise flow of the watercourse for dispersal. The drought option fauna involves the lowering of a Hands Off Flow (HOF) which would lead to a minor N/A N/A N/A N/A N/A N/A reduction in flow, and is therefore not anticipated to increase the risk of the None None spread of invasive non-native species.

Population and human 2.1 To protect and improve health and well- The drought option would provide up to 20.45 Ml/d, helping to maintain health being (including promoting the value of the essential public water supplies during drought conditions, and therefore help water environment for health and wellbeing). Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) maintain public health and well being. None Major beneficial

Population and human 2.2 To protect and enhance opportunities for Angling is unlikely to be impacted by flow reduction, however, the water quality health formal and informal recreation. implications of reduced flow on estuarine flushing (of one STW effluent plume) Large Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None on fisheries may become apparent.

Population and human 2.3 To promote a sustainable economy and The drought option will contribute to the maintenance of supply reliability in health thriving communities with good access to the Large Moderate Short-term Temporary High (beneficial) Medium (beneficial) drought conditions, ensuring a resilient supply for customers and economic None Major beneficial services they need. activity. Material assets and 3.1 To reduce, and make more efficient, the No adverse impacts on material assets are anticipated. The drought option resource use domestic, industrial and commercial involves the lowering of a HOF with no change in existing abstraction quantities consumption of resources, minimise the and no changes to energy use, generated waste or sustainable designs are Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial generation of waste, encourage its re-use and envisaged. The option will make use of existing infrastructure. eliminate waste sent to landfill.

Material assets and 3.2 To promote efficient water resource No opportunities to promote the sustainable management of natural resources resource use management and the sustainable management have been identified for this option. of natural resources, ensuring water supply for N/A N/A N/A N/A N/A N/A None None homes and industry in the area is maintained.

Water 4.1 To maintain or improve the quality of rivers, The River Hull was considered in the assessment. lakes, groundwater, estuarine and coastal The risk to water quality deterioration has been assessed as high related to waterbodies. potential dissolved oxygen sag and ammonia toxicity near the vicinity of a Large Moderate Short-term Temporary High (adverse) High (adverse) WwTW. Major adverse None Overall, moderate adverse effects are anticipated towards river and estuarine habitats.

Water 4.2 To avoid adverse impact on surface and The drought option would lead to a major reduction in low flows (up to 45.8%), groundwater levels and flows, including when with associated reduction in wetted width and depth over 0.1 km of the River this impacts on habitats and/or navigation. Hull. There would also be an uncertain reduction in fresh water inflow in the tidal zone of the river, spanning 30km. The drought option will not impact on the moderate to high flow regime in receiving watercourses. The watercourse is Large Moderate Short-term Temporary Medium (adverse) Low (adverse) Moderate adverse None navigable however impacts on navigation would be minimal. Overall, minor to moderate impacts are anticipated towards river habitats with the implementation of the drought option. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.3 To ensure appropriate and sustainable The drought option will contribute to the maintenance of supply reliability in management of abstractions (or compensation drought conditions, ensuring a resilient supply for customers and economic flow) to maintain water supplies whilst activity. The drought option will be accompanied by water conservation protecting ecosystem functions that rely on campaigns to promote efficient use of water to protect the environment and Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources. safeguard supplies. Water availability is at least 70% in the zone of influence of the drought option.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water efficiency have sustainable water use. N/A N/A N/A N/A N/A N/A been identified for this option. None None

Soil, geology and land use 5.1 To protect and enhance the quality and There are no land use changes associated with the implementation of the quantity of soils and to protect and enhance N/A N/A N/A N/A N/A N/A drought option. It is anticipated that there will be no impacts on geologically None None geodiversity. sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The drought option involves the lowering of the HOF of the abstraction, and N/A N/A N/A N/A N/A N/A would not result in any significant increases in emissions to atmosphere. None None

Air and climate 6.2 To reduce greenhouse gas emissions. The drought option will not result in an increase in energy use, therefore, no changes to greenhouse gas emissions are envisaged. The use of existing N/A N/A N/A N/A N/A N/A infrastructure will minimise increases in greenhouse gas emissions. None None

Air and climate 6.3 To consider the need for adaptive measures Drought options are a key component of Yorkshire Water's Drought Plan. The for climate change. Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) Plan aims to ensure resilience of water supplies to drought, which may become None Minor beneficial more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic Nearby ancient monuments and heritage sites are not water-dependent and Heritage environment, heritage assets and their settings would not be impacted by the drought option. and protect archaeologically important sites. N/A N/A N/A N/A N/A N/A None None

Landscape and Visual 8.1 To protect, enhance the quality of and There are no designated landscapes in the immediate vicinity. Amenity improve access to designated and undesignated landscapes, townscapes and the countryside. N/A N/A N/A N/A N/A N/A None None Part 1 of 2

Drought Plan Option Name: The River Derwent increased abstraction

Drought Plan Option Description: The drought option involves an increase in the abstraction volume in a licensing year from the River Derwent River Derwent Site 1, with an equivalent reduction in the annual licence volume permitted to be taken from an upstream abstraction point on the River Derwent Site 2.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including HRA screening has concluded that the drought permit will not result in likely fauna designated sites of nature conservation interest and significant effects on the designated features of any SAC/SSSI or NERC protected habitats and species (with particular regard to habitats. avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to climate change) and to protect and enhance natural capital Large Low Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None and the biodiversity and ecosystem services that contribute to the economy.

Population and human 2.1 To protect and improve health and well-being (including The drought option would help maintain essential public water supplies health promoting the value of the water environment for health during drought conditions, and therefore help maintain public health and and wellbeing). Large Moderate Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial well-being.

Population and human 2.2 To protect and enhance opportunities for formal and The drought option would cause a minor increase in flows, therefore minor informal recreation. health Large Moderate Short-term Temporary Medium (benefical) Low (beneficial) beneficial effects are anticipated towards recreational activities such as None Minor beneficial angling.

Population and human 2.3 To promote a sustainable economy and thriving The drought option will contribute to the maintenance of supply reliability health communities with good access to the services they need. in drought conditions, ensuring a resilient supply for customers and Large Moderate Short-term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, No impacts on material assets are anticipated. The option involves resource use industrial and commercial consumption of resources, relatively minor modifications to abstraction volumes only and no minimise the generation of waste, encourage its re-use and significant changes to energy use, generated waste or sustainable designs eliminate waste sent to landfill. Large Moderate Short-term Temporary Low (adverse) Medium (beneficial) None Minor beneficial are envisaged. The option will make use of existing infrastructure.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of natural resource use the sustainable management of natural resources, ensuring resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, The River Derwent has been included in this assessment. Water quality groundwater, estuarine and coastal waterbodies. throughout the study area is assessed as negligible risk of deteriorating. Large Moderate Short-term Temporary Low (adverse) Low (adverse) Negligible adverse None

Water 4.2 To avoid adverse impact on surface and groundwater The drought permit application for the River Derwent is to increase the levels and flows, including when this impacts on habitats annual abstraction limit at River Derwent Site 1 by 2,300 Ml/year, and to and/or navigation. correspondingly decrease the annual abstraction limit at River Derwent Site 2 by 2,300 Ml/year. The daily limits at each site, and all aggregate volumes are unchanged. The hydrological effects of the drought permit are considered probable and would be an increase in River Derwent flows downstream of River Derwent Site 2 intake as far as the River Derwent Site 1 intake (up to 9.9%), for a 23.9 km stretch, with the daily flow unaffected Medium Moderate Short-term Temporary Low (adverse) Low (adverse) downstream of River Derwent Site 1 intake. Overall, the magnitude of the Negligible adverse None effect on flows is considered indiscernible in the context of the River Wharfe's daily variability and all hydrological impacts are considered reversible. The drought permit is assessed as with negligible effect on the hydrology of the River Derwent throughout the study area.

Water 4.3 To ensure appropriate and sustainable management of The drought option would provide up to 20Ml/d which would contribute to abstractions (or compensation flow) to maintain water the maintenance of supply reliability in drought conditions, ensuring a supplies whilst protecting ecosystem functions that rely on resilient supply for customers and economic activity. water resources. The drought option will be accompanied by water conservation campaigns Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial to promote efficient use of water to protect the environment and safeguard supplies. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good practice Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water efficiency sustainable water use. N/A N/A N/A N/A N/A N/A have been identified for this option. None None

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There are no land use changes associated with the implementation of the and to protect and enhance geodiversity. drought option. It is anticipated that there will be no impacts on Large Moderate Short-term Temporary N/A N/A None None geologically sensitive sites.

Air and Climate 6.1 To maintain and improve air quality. The drought option involves minor modifications to abstraction volumes and would therefore not result in any significant increases in emissions to N/A N/A N/A N/A N/A N/A None None atmosphere.

Air and climate 6.2 To reduce greenhouse gas emissions. The increase in abstraction volumes would be associated with a negligible change in energy use and therefore no significant increase in greenhouse N/A N/A N/A N/A N/A N/A gas emissions are envisaged. The use of existing infrastructure will minimise None None increases in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought Plan. change. The Plan aims to ensure resilience of water supplies to drought which may Large Moderate Short-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Nearby ancient monuments and heritage sites are not water-dependent, heritage assets and their settings and protect Heritage N/A N/A N/A N/A N/A N/A and would not be impacted by the drought option. None None archaeologically important sites.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to Overall, the magnitude of the effect on flows is considered indiscernible in Amenity designated and undesignated landscapes, townscapes and the context of the River Wharfe's daily variability. Therefore, visual impacts the countryside. Large Moderate Short-term Temporary Low (adverse) Low (adverse) on the areas of nature conservation in the vicinity of the River Wharfe are Negligible adverse None considered negligible. Part 1 of 2

Drought Plan Option Name: (additional abstraction from and transfers) North West reservoir abstraction

Drought Plan Option Description: The drought option would involve increasing abstraction from North West Area Reservoir 9 to provide a benefit of up to 3.0 Ml/d. Water abstracted from the reservoir would be transferred via a temporary pipeline to the an aqueduct for subsequent treatment at Bradford WTW 1

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The extent of construction required for a fauna designated sites of nature conservation interest and temporary pipeline from the reservoir to the protected habitats and species (with particular regard to an aqueduct is currently unknown, however, avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to there are no nearby designated sites. climate change) and to protect and enhance natural capital Small Moderate Short term Temporary Low (adverse) Low (adverse) During operation the hydrological changes on Negligible adverse None and the biodiversity and ecosystem services that river flow level would be negligible, so there contribute to the economy. would be a negligible impact on habitats and NERC species.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. During construction of a the new pipeline, fauna there is potential for the spread of terrestrial invasive species. However, with best practice Small Moderate Short term Permanent Low (adverse) Medium (adverse) mitigation measures (e.g. washing Minor adverse construction vehicles), the spread of invasive species would be minimised.

Population and human 2.1 To protect and improve health and well-being The drought option would deliver 3.0 Ml/d health (including promoting the value of the water environment helping to maintain essential public water for health and wellbeing). Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) supplies during drought conditions and None Minor beneficial therefore help maintain public health.

Population and human 2.2 To protect and enhance opportunities for formal and The scheme may affect access to open spaces health informal recreation. through construction of temporary assets, and have a minor impact on informal recreation Small Moderate Short term Temporary Low (adverse) Medium (adverse) activities. Minor adverse None During the operational phase it is anticipated that there would be no impacts on recreational activities.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will health communities with good access to the services they need. contribute to the maintenance of supply reliability in drought conditions, ensuring a Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial resilient supply for customers and economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, Resources for construction of additional resource use industrial and commercial consumption of resources, components to the scheme will be sourced minimise the generation of waste, encourage its re-use and locally where possible. eliminate waste sent to landfill. Small Moderate Short term Temporary Low (adverse) Medium (adverse) Minor adverse None Once operational, there will be a minor increase in energy consumption.

Water 4.1 To maintain or improve the quality of rivers, lakes, There are known water quality issues within groundwater, estuarine and coastal waterbodies. the reservoir (reservoir stratification, algal blooms etc.) and the operation of this drought Small Low Short term Temporary Low (adverse) Medium (adverse) option could cause further water quality Minor adverse None impacts, however, this is uncertain.

Water 4.2 To avoid adverse impact on surface and groundwater The operation of the drought option will cause levels and flows, including when this impacts on habitats potential minor changes to the water level of and/or navigation. North West Area Reservoir 9 and result in a N/a Moderate Short term Temporary Low (adverse) Medium (adverse) loss of flow to the downstream watercourse Minor adverse None (Silesden Beck) due to the abstraction. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by abstractions (or compensation flow) to maintain water water conservation campaigns to promote supplies whilst protecting ecosystem functions that rely on efficient use of water to protect the water resources. Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) environment and safeguard supplies. None Minor beneficial Water availability is at least 70% in the zone of influence of the drought option.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of The potential effects on land-use associated soils and to protect and enhance geodiversity. with the construction work are considered small scale, temporary and reversible. Small Moderate Short term Temporary Low (adverse) Low (adverse) The scheme will not affect any sites designated Negligible adverse None for geological interest.

Air and Climate 6.1 To maintain and improve air quality. The increased energy use required during the operation of the option would be associated Small Moderate Short term Temporary Low (adverse) Low (adverse) with negligible adverse effects on air quality. Negligible adverse None

Air and climate 6.2 To reduce greenhouse gas emissions. The increased energy use would also be associated with negligible increases in Small Moderate Short term Temporary Low (adverse) Medium (adverse) Minor adverse None greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought plan options are a key component of change. Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial drought which may become more prevalent due to climate change.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no heritage assets or sites of Heritage heritage assets and their settings and protect archaeological importance in proximity to the archaeologically important sites. N/A N/A N/A N/A N/A N/A None None zone of influence of the option.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access A significant reduction in the level of North Amenity to designated and undesignated landscapes, townscapes West Area Reservoir 9 would have a visual and the countryside. impact on the landscape setting of Millennium Small Moderate Short term Temporary Low (adverse) Medium (adverse) Way National Trail. However, the reduced Minor adverse None level of the reservoir would be short-term and temporary. Part 1 of 2

Drought Plan Option Name: East Yorkshire Groundwater Option 2

Drought Plan Option Description: This drought option would involve relocating a borehole to enable the use of the existing abstration licence (6Ml/d annual average, 9Ml/d daily maximum). This option would only be implemented in the occurrence of a three-year drought.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ Potential residual effect on sensitive receptors (assuming good practice construction methods) Commentary significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The HRA screening of this option assessed the potential impact on two SAC's . Hydrological impacts of the drought option are fauna designated sites of nature conservation interest and unlikely to influence these sites. Impacts resulting from this are unlikely to lead to significant effects on qualifying features, protected habitats and species (with particular regard to avoiding the effects of over-abstraction on sensitive sites, including NERC species (birds, fish) and notable bird species, as reductions in the groundwater levels are unlikely to directly lead to habitats and species and consideration of adaptability to measurable reductions. The site is sufficiently distanced from proposed infrastructure for direct and in-direct impacts to be unlikely. climate change) and to protect and enhance natural capital HRA screening also assessed potential impacts on the a further SAC, SPA and Ramsar site. Abstraction would be within the existing and the biodiversity and ecosystem services that contribute licence limits. The small scale of the abstraction would be unlikely to affect flows in the River Derwent. The site is sufficiently to the economy. distanced from proposed infrastructure for direct and in-direct impacts to be unlikely. The new borehole would be located next to an existing reservoir, which is surrounded by Ancient Woodland, a lowland acid oak woodland with ornithological interest. There is existing access to the site. The construction of the new borehole would be likely to cause temporary impacts related to noise, vibration and dust; however, it is expected that these impacts on the neighbouring woodland would be mitigated through best practice construction and timing the construction to avoid adverse impacts on bird Small Moderate Short term Temporary Medium (adverse) Medium (adverse) populations. Moderate adverse None The exact route of the pipework connecting the new borehole to the water treatment works and reservoir is unknown and there is a risk of adverse impact on the ancient woodland through disturbance to root structure during excavation activities. At this stage a moderate adverse effect has been assessed pending further design details and method statements to demonstrate whether mitigation measures can avoid impact on the ancient woodland. Once operational, the scale of abstraction is relatively small in comparison to overall abstraction from the aquifer, but the abstraction is from the Wharfe and Lower Ouse WFD groundwater body which is classified as having a poor impact on surface waters. The additional actual abstraction is assessed as having the potential for no greater than minor adverse effects on aquatic flora and fauna.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. There is a small risk of introducing/spreading INNS during construction, mitigation measures will be implemented to avoid this. fauna Invasive species on site will be identified and removed or treated in advance of construction works. Small Moderate Long term Permenant Low (adverse) Low (adverse) Operation of the scheme is not expected to introduce or spread INNS, as it would not involve movement of people or resources Negligible adverse None (e.g. water) between sites or catchments.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver up to 9.0 Ml/d helping to maintain essential public water supplies during drought conditions and health promoting the value of the water environment for health therefore help maintain public health. and wellbeing). Low (adverse) Medium (adverse) The construction of the new borehole and pipeline may have a temporary, minor, adverse impact upon residents located nearby Small Moderate Short term Temporary Minor adverse Minor beneficial Low (beneficial) Medium (beneficial) (population density 138/km2), particularly residents in close proximity to the construction site, due to nuisance from noise, dust and vibration.

Population and human 2.2 To protect and enhance opportunities for formal and The construction work may temporarily impact those who use the woods for informal recreation and ornithology through health informal recreation disturbance from noise, dust and vibration. The construction activity may also have some temporary impact upon recreation due to potential disruption to public paths and rights of access. These effects would be mitigated as far as possible through best practice Small Moderate Short term Temporary Low (adverse) Medium (adverse) construction measures. Minor adverse None Once operational, there is unlikely to be any permanent effects on recreation, human health or access to the environment.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will contribute to the maintenance of supply reliability in drought conditions, ensuring a health communities with good access to the services they need. resilient supply for customers and economic activity. Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, Scheme construction will require some use of materials at a scale consistent with the size of the scheme (new pumping station and resource use industrial and commercial consumption of resources, pipeline). However the scheme will make good use of a large part of existing infrastructure. minimise the generation of waste, encourage its re-use and Small Moderate Short term Temporary Low (adverse) Low (adverse) Negligible adverse None eliminate waste sent to landfill. Once operational, minimal material inputs will be required, other than for regular maintenance but some minor additional resources will be needed for treatment chemicals and power for pumping. Material assets and 3.2 To promote efficient water resource management and The drought option would make greater use of the existing abstraction licence (6Ml/d annual average, 9Ml/d daily maximum) and resource use the sustainable management of natural resources, ensuring improving the existing efficiency of the management of the water resources need to maintain essential public water supplies during water supply for homes and industry in the area is Small Moderate Long-term Permanent Low (beneficial) Medium (beneficial) None Minor beneficial maintained. drought conditions.

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards the Selby Dam were considered in the assessment. groundwater, estuarine and coastal waterbodies. Pollution risks from construction activity should be mitigated by best practice methods. There may be a negligible adverse impact on river water quality at low flows due to the potential impact of reduction in base flow from the aquifer as a result of the Small Low Short term Temporary Low (adverse) Medium (adverse) increased abstraction, however this needs to be assessed further as the hydrological connectivity is unknown and consequently, the Minor adverse None risk of deterioration of WFD status (fish and macroinvertebrates) is uncertain. Downstream impacts to the River Ouse are unlikely given the small abstraction compared to flows within the River Ouse.

Water 4.2 To avoid adverse impact on surface and groundwater The abstraction is from the Wharfe and Lower Ouse and Sherwood Sandstone WFD groundwater body which is classified as having levels and flows, including when this impacts on habitats poor quantitative status due to depressed groundwater levels. Although abstraction would be within existing licence limits, the and/or navigation. increase in actual abstraction could have a moderate adverse effect, although not sufficient to lead to deterioration in WFD status Small Low Short term Temporary Medium (adverse) Medium (adverse) to “bad”. The previous abstraction at Brayton North abstracted the same quantities as this proposed scheme. therefore it is unlikely Moderate adverse None to affect the water balance on a groundwater body scale, however further investigation is required.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation campaigns to promote efficient use of water to protect the abstractions (or compensation flow) to maintain water environment and safeguard supplies. supplies whilst protecting ecosystem functions that rely on Small Low Short term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources. Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water efficiency have been identified for this option. sustainable water use. N/A N/A N/A N/A N/A N/A None None Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ Potential residual effect on sensitive receptors (assuming good practice construction methods) Commentary significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils Construction of the new borehole and pipeline will have a short term, temporary but negligible effect on the quality and quantity of and to protect and enhance geodiversity. Low (adverse) Low (adverse) Small Moderate Long-term Temporary the soils in the area. Given the small-scale of the borehole, no long-term adverse effects are anticipated on soils, geology or overall Minor adverse None Low (beneficial) Low (beneficial) land-use management.

Air and Climate 6.1 To maintain and improve air quality. Construction work and vehicle movements associated with construction phase will give rise to temporary air pollutant emissions and dust over the short term (6 months), but these will be minimised through best construction practices. There are no AQMAs within proximity of the scheme. Operation of the scheme will require a small increase in energy consumption associated with the Small Moderate Short term Temporary Low (adverse) Medium (adverse) Negligible adverse None increased groundwater pumping and additional water treatment. Air emissions would be negligible as energy would be supplied from the grid so would not be local.

Air and climate 6.2 To reduce greenhouse gas emissions. Construction work and vehicle movements associated with construction phase will give rise to temporary GHG emissions over the short term (6 months), but these will be minimised through best construction practices. Construction is anticipated to result in Small Moderate Short term Temporary Low (adverse) Medium (adverse) emission of 1,269t/CO2. The increased energy consumption during operation would be associated with a negligible increase in GHG Minor adverse None emissions

Air and climate 6.3 To consider the need for adaptive measures for climate The drought option will be accompanied by water conservation campaigns to promote efficient use of water to protect the change. Small Moderate Short term Temporary Low (beneficial) Medium (beneficial) environment and safeguard supplies. None Minor beneficial Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no known water dependent cultural heritage assets that might be affected by the potential small reduction in base flow Heritage heritage assets and their settings and protect due to the abstraction. Construction work has the potential to disturb unknown buried assets, however this would be further archaeologically important sites. evaluated by desk studies and other investigations prior to construction. A watching brief, surveys and investigation may be Small Moderate Long-term Temporary Low (adverse) Low (adverse) Negligible adverse None implemented during construction if required to reduce the risk of adverse impact to any unknown heritage assets.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are no designated landscapes in proximity to the scheme. There may be small scale, temporary adverse effects locally on Amenity to designated and undesignated landscapes, townscapes visual amenity due to construction activity within a woodland setting. However given the small-scale of the borehole, permanent and the countryside. Small Moderate Short term Temporary Low (adverse) Low (adverse) visual impact is unlikely and would be mitigated by screening and design measures. Operation of the scheme is assessed would have Negligible adverse None no greater than a negligible impact on landscape and visual amenity arising from the potential small reduction in base flow due to the abstraction. Part 1 of 2

Drought Plan Option Name: North Yorkshire Groundwater increased abstraction

Drought Plan Option Description: The drought option relates to an increased abstraction from the North Yorkshire Groundwater increased abstraction in which, during a drought abstraction would increase from 8Ml/d (annual average) and 12.5Ml/d (daily maximum). No additional construction is required.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Stage 1 HRA screening has indicated that likely significant effects on a SAC could not be ruled out as fauna designated sites of nature conservation interest and a result of the implementation of the North Yorkshire Groundwater Increased Abstraction scheme. protected habitats and species (with particular regard to HRA Guidance indicates that the Plan making authority (in this case Yorkshire Water) shall adopt, or avoiding the effects of over-abstraction on sensitive sites, habitats and species) and consider adaptability to climate otherwise give effect to the Plan, only after having ascertained that it will not adversely affect the change. integrity of a European site. As such, a Stage 2 HRA was required to determine whether the implementation of the North Yorkshire Groundwater Increased Abstraction Scheme could impact on the conservation objectives or the qualifying features of the SAC. The units of the SAC most likely to be affected by the scheme are located between 4.9km and 6.7km from the scheme location. Analysis of geological and borehole data indicate that the SACs are above the groundwater water table level and that the SACs are designated for non-water dependant features. As such, it is concluded that abstraction from the proposed scheme will not have a significant adverse effect on the qualifying features of the Meadows SAC. There is no construction associated with this option. No operational impacts on NERC species are Small Moderate Short term Temporary Low (adverse) Medium (adverse) envisaged due to the lack of hydraulic connectivity between the groundwater and surface water, Negligible adverse None however there is some residual uncertainty in relation to the impacts of increased groundwater abstraction from the boreholes. The scheme is in proximity to one SSSI, which is a water dependent site situated downstream on the River Swale flood plain. The site is premoninantly supported by surface water flows and river sands and gravels – it is not in direct hydraulic connectivity. Based on available data it is concluded that the drought option will have negligible impacts on the baseflow contributions to the River Swale, which supports the SSSI.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. No impacts on invasive species are envisaged during operation of this drought option. fauna N/A N/A N/A N/A N/A N/A None None

Population and human 2.1 To protect and improve health and well-being and The drought option would deliver an additional 2 Ml/d helping to maintain essential public water health reduce inequalities supplies during drought conditions and therefore help maintain public health. Small Moderate Short term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial

Population and human 2.2 To protect and enhance opportunities for formal and There is no construction associated with this option. health informal recreation. There are no recreational areas nearby and no national trails, therefore impacts are not expected N/A N/A N/A N/A N/A N/A during the implementation of the drought option. None None

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will contribute to the maintenance of supply reliability in health communities with good access to the services they need. drought conditions, ensuring a resilient supply for customers and economic activity with no Small Moderate Short term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial permanent adverse effects on the environment.

Material assets and 3.1 To reduce, and make more efficient, the domestic, There is no construction associated with this option. Once operational, minimal material inputs will resource use industrial and commercial consumption of resources, be required, other than for regular maintenance but some minor additional resources will be minimise the generation of waste, encourage its re-use and Small Moderate Short term Temporary Low (adverse) Medium (adverse) needed for treatment chemicals and power for pumping. Minor adverse None eliminate waste sent to landfill.

Water 4.1 To maintain or improve the quality of rivers, lakes, There may be a negligible adverse impact on river water quality at low flows due to the potential groundwater, estuarine and coastal waterbodies. impact of a minor reduction in baseflow from the Millstone Grit and Carboniferous Limestone Small Moderate Short term Temporary Low (adverse) Low (adverse) aquifer as a result of the increased abstraction, however this needs to be assessed further. Negligible adverse None

Water 4.2 To avoid adverse impact on surface and groundwater There may be a local, negligible impact on baseflow to the River Swale from the Millstone Grit and levels and flows, including when this impacts on habitats Carboniferous Limestone aquifer as a result of the increased abstraction. This would require further and/or navigation. Small Moderate Short term Temporary Low (adverse) Low (adverse) Negligible adverse None investigation.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation campaigns to promote efficient use water supplies whilst protecting ecosystem functions that of water to protect the environment and safeguard supplies. rely on water resources including contributing to the Small Moderate Short term Temporary Low (beneficial) High (beneficial) Water availability is at least 50% in the zone of influence of the drought option. None Moderate beneficial achievement of WFD objectives

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There is no additional land take or excavations or construction associated with the scheme, and to protect and enhance geodiversity. N/A N/A N/A N/A N/A N/A therefore no impacts are anticipated. None None

Air and Climate 6.1 To maintain and improve air quality. The small increase in energy consumption would be associated with minor adverse effects on air Small Moderate Short term Temporary Low (adverse) Medium (adverse) quality. Minor adverse None

Air and climate 6.2 To reduce greenhouse gas emissions. The increase in energy consumption would also be associated with a minor increase in greenhouse Small Moderate Short term Temporary Low (adverse) Medium (adverse) gas emissions. Minor adverse None Part 2 of 2

SEA topics and objectives Assessment of option

Air and climate 6.3 To consider the need for adaptive measures for climate Drought options are a key component of Yorkshire Water's Drought Plan. The Plan aims to ensure change. resilience of water supplies to drought which may become more prevalent due to climate change. Small Moderate Short term Temporary Medium (beneficial) Medium (beneficial) None Moderate beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no listed or designated assets within proximity to the scheme. There are no known water Heritage heritage assets and their settings and protect dependent heritage assets that might be affected by the potential small reduction in baseflow due archaeologically important sites. N/A N/A N/A N/A N/A N/A None None to the abstraction.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are no landscape designations in proximity to the scheme. designated and undesignated landscapes, townscapes and Amenity N/A N/A N/A N/A N/A N/A None None the countryside. Part 1 of 2

Drought Plan Option Name: Tees - Swale transfer

Drought Plan Option Description: This drought option would transfer water from the River Tees and/or the River Tyne (via the River Tees) to an existing abstraction point on the River Ouse . Transfers from the Tyne to the Tees would only occur when there is insufficient water available from resources in the Tees catchment. YWSL identify that the option would only be implemented during a water resources drought as a last resort. The likelihood of its implementation is further reduced by a likely lead-in period of 18 months due to the requirement for construction of a 15.7km pipeline. The transfer would require construction of a pipeline to extend an already constructed but as yet unused pipeline. Water would then be transferred using the river system of the Rivers Swale and Ouse to the existing abstraction on the Ouse. The drought option would deliver up to 42Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ or Certainty of effect Short-term/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect population Magnitude of effect Topic Objective (low/ moderate/ medium-term/ effect (permanent/ receptor (low/ medium/ Potential residual effect on sensitive receptors (assuming good practice construction methods) Commentary significance (likely to remain significance (likely to remain affected (low/ medium/ high) high) long-term temporary) high) after reasonable mitigation) after reasonable mitigation) (small/medium/lar ge)

Biodiversity, flora and fauna 1.1 To conserve and enhance biodiversity, including Preliminary environmental assessment and the HRA highlighted potential, but uncertain adverse effects on several designated sites of nature conservation interest and designated European sites, SSSIs and NERC species (including impacts of supporting transfer flows from Cow Green protected habitats and species (with particular regard to Reservoir and/or Kielder Water via the North Tyne to Tees tunnel). avoiding the effects of over-abstraction on sensitive sites, habitats and species) and consider adaptability to climate - Tyne Waters meet SSSI in Reach 1 (Tyne): impacts on flooding of site are assessed as minor, but some uncertainty change. remains. - In Reach 2A (Tees) the impact on North Pennine Moors SPA, Moor House-Upper Teesdale SAC and Upper Teesdale SSSI in the Cow Green/Upper River Tees area is assessed as negligible impact: the Tees abstraction is unlikely to adversely affect Cow Green water levels and is within current licensed limits. - Impacts on Appleby Fells SSSI are assessed as negligible due to negligible impact on Cow Green. - Reach 2B (Tees): impact on Hell Kettles SSSI assessed as negligible given the hydrological characteristics of the site. - Negligible impact on NERC species (Fish) in Reach 1A (Tyne) as risk of entrainment due to abstraction can be mitigated. - The impacts in the Tees catchments on NERC fish species are assessed as minor in relation to changes in water chemistry, disease transfer risks, invasive species migration, temperature and flow/level changes due to River North Tyne Large Moderate Short term Permanent Medium (adverse) Medium (adverse) transfers. Moderate adverse None - Adverse effects in the Swale catchment on NERC fish species are assessed as moderate due to risk of mortality or harm if there was a transfer of a notifiable fish disease from the Tees. - Uncertain effects in the Swale catchment regarding NERC species Freshwater White – clawed Crayfish. - Uncertain construction impacts on NERC Species, including otter, great crested newt, badger and common reptiles. - The sensitivity of the WFD status is assessed as minor.

Biodiversity, flora and fauna 1.2 To avoid introducing or spreading INNS. There is uncertainty surrounding the likely effect of flow and level impacts upon existing invasive species populations and their ability to distribute further within the watercourse. However, the minor hydrological impact is not considered likely to significantly impact upon the species as hydrological conditions and water levels are only subject to slight change.

There is uncertainty as to the scheme’s overall potential impact regarding catchment river transfers and INNS risks. For Large Moderate Short term Permanent Medium (adverse) High (adverse) example, the transmission of crayfish plague. Without effective mitigation this is considered of major concern. Major adverse Uncertainty also surrounds the impact of construction on the spread of invasive species such as Japanese knotweed.

Population and human 2.1 To protect and improve health and well-being and The drought option would deliver 42 Ml/d helping to maintain essential public water supplies during drought conditions health reduce inequalities and therefore help maintain public health. Large Moderate Short term Temporary High (beneficial) Medium (adverse) None Major beneficial

Population and human 2.2 To protect and enhance opportunities for formal and The scheme will not affect access to open spaces but may have a minor impact on informal recreational activities. The health informal recreation. Teesdale Way runs along the River Swale, construction may impact access, however during the operation no issues are Large Moderate Short term Temporary Low (adverse) Medium (adverse) anticipated. Navigation would not be affected. Minor adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option would contribute to the maintenance of supply reliability in drought conditions, ensuring a resilient supply for health communities with good access to the services they need. customers and economic activity. Large Moderate Short term Temporary High (beneficial) Medium (adverse) None Major beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, The scheme's construction (15.7 km pipeline) would involve a medium scale consumption of resources and once resource use industrial and commercial consumption of resources, operational, additional chemicals and energy would be required for water treatment and distribution. To mitigate the minimise the generation of waste, encourage its re-use and adverse effects, resources for construction would be sourced locally where possible. eliminate waste sent to landfill. Large Moderate Short term Temporary Medium (adverse) Medium (adverse) Moderate adverse None

Water 4.1 To maintain or improve the quality of rivers, lakes, Impacts towards reaches of the River Tees, River Swale, River Tyne and River Ouse were considered in the assessment. groundwater, estuarine and coastal waterbodies. Water quality impact risk has been assessed as negligible as the drought option would not lower river flows (and will increase flows in some reaches). Negligible impacts associated with reduced dilution of effluent can be expected. Large Moderate Short term Temporary Low (adverse) Low (adverse) Negligible adverse None Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.2 To avoid adverse impact on surface and groundwater The drought option involves transfer of surplus licensed water, and does not require abstraction in excess of current levels and flows, including when this impacts on habitats licensed volumes for the River Ouse, River Tees or the River Tyne. Flows in the River Tees will be supported by releases and/or navigation. from Cow Green Reservoir and those from the River Tyne by releases from Kielder Water. The transfers may result in amelioration of drought impacts in reaches where flows are increased, which may be important ecologically. However, flow releases and transfers do lead to some alterations to the natural flow regime, although well within the normal flow Autumn/ Winter ranges of each river. The change in wetted width and depth is therefore expected to not vary outside the natural regime Moderate Short term Temporary Low (adverse) Medium (adverse) Minor adverse None 2016 of the river. Negligible to minor hydrological impacts (increase of up to 53% in flows) were identified for the River Tyne (72 km), River Tees (125 km) and River Ouse (17 km) and major impacts (increase of 71% in flows) for the River Swale.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation campaigns to promote efficient use of water to protect water supplies whilst protecting ecosystem functions that the environment and safeguard supplies. rely on water resources including contributing to the Large Moderate Short term Temporary Low (beneficial) Medium (beneficial) Water availability is at least 50% in the zone of influence of the drought option. None Minor beneficial achievement of WFD objectives

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There would be no permanent land use changes associated with the construction of the pipeline associated with this and to protect and enhance geodiversity. option. No impacts on geologically important sites are anticipated. Impacts on soils during construction would be Large Moderate Short term Temporary Low (adverse) Low (adverse) negligible as they would be ameliorated through best practice construction techniques and appropriate mitigation Negligible adverse None measures.

Air and Climate 6.1 To maintain and improve air quality. The construction phase of the new pipeline would give rise to dust emissions that could impact nearby sensitive environmental receptors. However, these effects would be minimised through best practice construction methods, as such, the residual effects would only be minor adverse. During the operational phase of the scheme, there would be increased energy use associated with pumping and Large Moderate Short term Permanent Low (adverse) Medium (adverse) Minor adverse None treatment processes. There would be a proportional increase in emissions to atmosphere, however, energy would be supplied from the grid so emissions would not be localised.

Air and climate 6.2 To reduce greenhouse gas emissions. The construction phase of the new pipeline and the pumping and treatment processes involved in the operational phase would be associated with an increase in energy use. This would result in moderate adverse effects associated with the Large Moderate Short term Permanent Medium (adverse) Medium (adverse) increase in greenhouse gas emissions. Moderate adverse None

Air and climate 6.3 To consider the need for adaptive measures for climate Supply-side options are a key component of Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water change. supplies to drought which may become more prevalent due to climate change. Large Moderate Short term Permanent Low (beneficial) Medium (adverse) None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No known water-dependent cultural heritage or archaeology sites are located within or adjacent to the impacted reaches. Heritage heritage assets and their settings and protect Impacts on other cultural heritage or archaeology sites due to construction or operation of the scheme are assessed as archaeologically important sites. Large Moderate Short term Temporary Low (adverse) Low (adverse) negligible. Negligible adverse None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to Construction of pipelines and outfall structure and re-commissioning of assets will have a temporary minor adverse Amenity designated and undesignated landscapes, townscapes and impact on visual amenity, but permanent impacts assessed as negligible with appropriate design and screening where the countryside. appropriate. Potential minor adverse impact on water levels in Cow Green and Kielder Water reservoirs due to additional Large Moderate Short term Temporary Low (adverse) Medium (adverse) abstraction compared to normal. Potential minor beneficial impact on river reaches where flows are increased by Minor adverse None transfers. Part 1 of 2

Drought Plan Option Name: Tees-Swale (direct pipeline)

Drought Plan Option Description: The scheme comprises a complete pipeline connection between the River Tees and the River Derwent Water Treatment Works 1. A new pipeline and inline pumping station will connect the existing pipeline to a high point and a new break pressure tank at the Yorkshire Water site YWSL Site. From here the water will flow by gravity via a new pipeline, from where it will join Ouse pumping station to River Derwent Water Treatment Works 1 raw water pipeline. This option utilises the existing Northumbrian Water Ltd River Tees intake and pumping station. The option would deliver a deployable output of up to 40 Ml/d.

SEA topics and objectives Assessment of option

Scale of effect: Value/ sensitivity of geographical &/ or Certainty of effect Permanence of Residual adverse effect Residual beneficial effect Short-term/ medium- Magnitude of effect receptor (low/ Potential residual effect on sensitive receptors (assuming good practice construction Topic Objective population affected (low/ moderate/ effect (permanent/ significance (likely to remain significance (likely to remain term/ long-term (low/ medium/ high) medium/ methods) Commentary (small/medium/large high) temporary) after reasonable mitigation) after reasonable mitigation) high) )

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Preliminary environmental assessment and HRA of the scheme construction and operation fauna designated sites of nature conservation interest and has highlighted a number of potential, but uncertain adverse effects on several designated protected habitats and species (with particular regard to avoiding the effects of over-abstraction on sensitive sites, European sites, SSSIs and NERC species (including impacts of supporting transfer flows from habitats and species and consideration of adaptability to Cow Green Reservoir and/or Kielder Water via the North Tyne to Tees tunnel). climate change) and to protect and enhance natural capital -Tyne Waters meet SSSI in Reach 1 (Tyne): impacts on flooding of site are assessed unlikely, and the biodiversity and ecosystem services that contribute however further investigation is required. to the economy. - In Reach 2A (Tees) the impact on North Pennine Moors SPA, Moor House-Upper Teesdale SAC and Upper Teesdale SSSI in the Cow Green/Upper River Tees area is assessed as negligible impact: the Tees abstraction is unlikely to adversely affect Cow Green water levels and is within current licensed limits. Impacts of licence were assessed as part of Review of Consents under Habitats Directive. - Impacts on Appleby Fells SSSI are assessed as negligible due to negligible impact on Cow Green Reservoir levels, however further investigation is needed. Medium Moderate Medium-term Permanent Low (adverse) Medium (adverse) Reach 2B (Tees): Impact on Hell Kettles SSSI assessed as negligible given the hydrological Minor adverse None characteristics of the site and that there will be no net impact on flows in the Tees. However, there may be construction impacts. The impacts in the Tees catchments on NERC fish species are assessed as minor in relation to changes in disease transfer risks, invasive species migration, due to River North Tyne transfers. There are uncertain construction impacts on NERC and notable species including Otter, Great Crested Newt, Bats, and common reptiles. The sensitivity of WFD status of the surrounding waterbodies is assessed as minor.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. The risk of the spread of signal crayfish and crayfish plague would be minor for the native fauna white clawed crayfish (NERC species) in the Tees catchments as a result of flow and level Medium Moderate Medium-term Permanent Medium (adverse) High (adverse) changes. There is also the potential for other invasive species be spread during construction, Minor adverse None however, this is currently uncertain.

Population and human 2.1 To protect and improve health and well-being The drought option would provide 40 Ml/d, helping to maintain essential public water health (including promoting the value of the water environment supplies during drought conditions and therefore help maintain public health. for health and wellbeing). Large Moderate Medium-term Temporary High (beneficial) Medium (beneficial) None Major beneficial

Population and human 2.2 To protect and enhance opportunities for formal and The scheme would not affect access to open spaces, but may have a negligible adverse health informal recreation. impact on a golf course and caravan site in close proximity to the impacted reaches. Large Moderate Medium-term Temporary Low (adverse) Low (adverse) Negligible adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in drought conditions, communities with good access to the services they need. health Large Moderate Medium-term Temporary High (beneficial) Medium (beneficial) ensuring a resilient supply for customers and economic activity. None Major beneficial

Material assets and 3.1 To reduce, and make more efficient, the domestic, The scheme's construction (+50 km pipeline) would involve a large scale consumption of resource use industrial and commercial consumption of resources, resources and once operational, additional chemicals and energy would be required for minimise the generation of waste, encourage its re-use and water treatment and distribution. To mitigate the adverse effects, resources for eliminate waste sent to landfill. Large Moderate Medium-term Temporary High (adverse) Medium (adverse) Major adverse None construction would be sourced locally where possible.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of natural resources have been resource use the sustainable management of natural resources, ensuring identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Part 2 of 2

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, The risk of water quality deterioration would be negligible as the drought option would not groundwater, estuarine and coastal waterbodies. lower flows in the River Tees. Negligible impacts associated with reduced dilution of effluent Medium Moderate Medium-term Temporary Low (adverse) Medium (adverse) can be expected. The sensitivity of the WFD status is assessed as minor. Minor adverse None

Water 4.2 To avoid adverse impact on surface and groundwater The drought option involves transfer of surplus licensed water and does not require levels and flows, including when this impacts on habitats abstraction in excess of current licensed volumes for the River Tees or the River Tyne. Flows and/or navigation. in the River Tees will be supported by releases from Cow Green Reservoir and those from the River Tyne by releases from Kielder Green. The transfers may result in amelioration of drought impacts in reaches where flows are increased, which may be important ecologically. Medium Moderate Medium-term Temporary Low (adverse) Medium (adverse) However, flow releases and transfers do lead to some alterations to the natural flow regime Minor adverse None which could have minor adverse impacts on habitats.

Water 4.3 To ensure appropriate and sustainable management of The drought option will be accompanied by water conservation campaigns to promote abstractions (or compensation flow) to maintain water efficient use of water to protect the environment and safeguard supplies. supplies whilst protecting ecosystem functions that rely on Large Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial water resources.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water efficiency have been sustainable water use. identified for this option. N/A N/A N/A N/A N/A N/A None None

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils The land required to accommodate the new pipeline and other features of the scheme and to protect and enhance geodiversity. would have moderate adverse effects on land use and it is anticipated that there would be Large Moderate Medium-term Temporary Medium (adverse) Medium (adverse) Moderate adverse None no impact on geologically sensitive sites.

Air and Climate 6.1 To maintain and improve air quality. The construction phase of the new pipeline would give rise to dust emissions that could impact nearby sensitive environmental receptors. However, these effects would be minimised through best practice construction methods, as such, the residual effects would only be minor adverse. Large Moderate Medium-term Temporary Low (adverse) Medium (adverse) During the operational phase of the scheme, there would be increased energy use Minor adverse None associated with pumping and treatment processes. There would be a proportional increase in emissions to atmosphere, however, energy would be supplied from the grid so emissions would not be localised.

Air and climate 6.2 To reduce greenhouse gas emissions. The construction phase of the new pipeline and the pumping and treatment processes involved in the operational phase would be associated with an increase in energy use. This Large Moderate Medium-term Temporary Medium (adverse) Medium (adverse) would result in major adverse effects associated with the increase in greenhouse gas Moderate adverse None emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought plan options are a key component of Yorkshire Water's Drought Plan. The Plan aims change. to ensure resilience of water supplies to drought conditions which may become more Large Moderate Medium-term Temporary Low (beneficial) Medium (beneficial) prevalent due to climate change. None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No known water-dependent cultural heritage or archaeology sites are located within or Heritage heritage assets and their settings and protect adjacent to the impacted reaches. Potential impacts on other cultural heritage or archaeologically important sites. archaeology sites due to the construction phase of the scheme would be negligible, as Large Moderate Medium-term Temporary Low (adverse) Low (adverse) appropriate mitigation measures would ensure that assets are not impacted. Negligible adverse None

Landscape and Visual 8.1 To protect, enhance the quality of and improve access The construction of the pipeline would have a temporary minor adverse impact on visual Amenity to designated and undesignated landscapes, townscapes amenity of the surrounding countryside, however, permanent impacts are considered to be and the countryside. negligible when accounting for appropriate design and visual screening. The impact on the Large Moderate Medium-term Temporary Low (adverse) Medium (adverse) natural flow regime in the impacted water courses would not be perceptible. Minor adverse None Part 1 of 2

Drought Plan Option Name: Aire abstraction

Drought Plan Option Description: Involves the construction and use of a new river abstraction on the Aire abstraction to provide up to 50Ml/d during any month of the year.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including Uncertainty surrounds the potential impact from construction on fauna designated sites of nature conservation interest and various NERC species near the new river abstraction (birds, great protected habitats and species (with particular regard to crested newts, bats, otter, water vole, common reptiles, badgers). avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to The proposed pipeline passes within 4.5km of a SAC/SPA/SSSI. climate change) and to protect and enhance natural capital Potential impacts could arise during the construction phase as a and the biodiversity and ecosystem services that contribute result of noise and dust generation, but best practice design and to the economy. construction methods should mitigate this risk. One SSSI is downstream of the proposed abstraction at Bingley and may be influenced by reduction in flows. Another SSSI is located within 1km of the proposed abstraction at Bingley. Impact risk has been assessed as minor assuming best practice methods deployed. There is the potential risk of major impact for aquatic NERC species Large Medium Short term Temporary Medium (adverse) High (adverse) during operation (brown trout, grayling, bullhead, European eel, Major adverse None white-clawed crayfish, barbel) in the reach immediately downstream of the intake, but reducing after 1km to minor impact risk with the increased flow contributions. Negligible impact 30km downstream. Operation of the scheme has been assessed as minor impact risk for one SSSI, and uncertain risk for two other SSSI's.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Construction impacts on spread of invasive species are uncertain. It fauna is assumed that appropriate measures (such as washing construction vehicles as they leave site etc.) will be taken to mitigate the spread Large Medium Long term Permanent Low (adverse) Medium (adverse) of invasive species, however these species will be present along the Minor adverse None construction route. Operational impacts are not anticipated to increase the spread of invasive species.

Population and human 2.1 To protect and improve health and well-being (including The drought option will help to maintain essential public water health promoting the value of the water environment for health supplies during drought conditions and therefore help maintain and wellbeing). Large Medium Short term Temporary High (beneficial) Medium (beneficial) None Major beneficial public health / wellbeing by supplying up to 50Ml/d.

Population and human 2.2 To protect and enhance opportunities for formal and During construction, access to areas used for recreation may be health informal recreation reduced, however if best practice is followed, suitable diversions will be put in place. There are no national trails nearby. During operation the scheme will not affect access to open spaces Large Medium Short term Temporary Low (adverse) Low (adverse) but may have a minor impact on informal recreation activities such Negligible adverse None as fishing, however water levels will be naturally low during a drought.

Population and human 2.3 To promote a sustainable economy and thriving Implementation of the drought option will contribute to the health communities with good access to the services they need. maintenance of supply reliability in drought conditions (50Ml/d), Large Medium Short term Temporary High (beneficial) Medium (beneficial) ensuring a resilient supply for customers and economic activity with None Major beneficial no permanent adverse effects on the environment, if best practice is followed.

Material assets and 3.1 To reduce, and make more efficient, the domestic, Resources for construction of additional components to the scheme resource use industrial and commercial consumption of resources, will be sourced locally where possible. The scheme construction will minimise the generation of waste, encourage its re-use and require some use of materials at a scale consistent with the size of eliminate waste sent to landfill. the new abstraction and some of the infrastructure is already in Large Medium Long term Permanent Medium (adverse) Medium (adverse) Moderate adverse None place. Once operational, there will be some additional energy and chemical use to pump and treat the water.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming good Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Water 4.1 To maintain or improve the quality of rivers, lakes, During operation abstraction on the River Aire will reduce dilution of groundwater, estuarine and coastal waterbodies. effluent due to a reduction in low flow regime. Two further consented significant water quality pressures (YW STW) are located in the impacted reach downstream, with a medium risk of WFD Large Medium Short term Temporary Medium (adverse) Medium (adverse) deterioration for total ammonia and oxygen. Abstraction under Moderate adverse None drought conditions will therefore likely have a moderate adverse effect on water quality.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option will lead to a major reduction in low flows (up to levels and flows, including when this impacts on habitats 52% in the summer and up to 39% in the winter) during operation. and/or navigation. This will likely have impacts on wetted width and habitat availability. Major hydrological impacts are therefore anticipated in these Large Medium Short term Temporary Medium (adverse) Medium (adverse) impacted reaches. However, downstream of this, the impact is minor Moderate adverse None to moderate. The drought option will not impact on the moderate to high flow regime in the river.

Air and Climate 6.1 To maintain and improve air quality. Construction work and vehicle movements associated with construction phase will give rise to air emissions and dust over the short term, these will be minimised through best construction practices. However, there will be small-scale carbon impact from Large Medium Short term Permanent Low (adverse) Medium (adverse) construction of new assets. Minor adverse None Increased pumping and treatment of water (replacing gravity reservoir supplies), so some additional energy use is envisaged during operation. There are no AQMA sites nearby.

Air and climate 6.2 To reduce greenhouse gas emissions. Construction work and vehicle movements associated with construction phase will give rise to GHG emissions, these will be minimised through best construction practices. Large Medium Short term Permanent Low (adverse) Medium (adverse) During operation, there will be increased pumping and treatment of Minor adverse None water (replacing gravity reservoir supplies), so some additional greenhouse emission are envisaged during operation.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought plan options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water supplies to Large Medium Short term Permanent Low (beneficial) Medium (beneficial) drought which may become more prevalent due to climate change. None Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, Several sites of archaeological and cultural heritage value are in Heritage heritage assets and their settings and protect proximity to impacted river reaches, including Saltaire World archaeologically important sites. Heritage Site and Kirkstall Abbey, but there are no water-dependent sites. Large Medium Short term Permanent Low (adverse) Low (adverse) The pumping station and pipeline construction impacts would be Negligible adverse None contained to a small area. Best practice design and construction methods should be used to mitigate impacts. No operational impacts due to lower river flows are anticipated.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access There are some limited construction impacts on visual amenity Amenity to designated and undesignated landscapes, townscapes anticipated in rural areas during river intake and pipeline and the countryside. Large Medium Short term Temporary Low (adverse) Medium (adverse) construction, but this would be short-term. Minor adverse None During operation there would be little above ground assets once construction completed. There are no AONB nearby. Part 1 of 3

Drought Plan Option Name: Increased Ouse pumping capacity

Drought Plan Option Description: This scheme is to increase the pumping capacity at Ouse pumping station to 150 Ml/d by removing operational or infrastructure constraints. The potential additional resource from the drought option is an average 10 Ml/d.

SEA topics and objectives Assessment of option

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The proposed pipeline passes approximately fauna designated sites of nature conservation interest and 500m from one SSSI (which supports a range of protected habitats and species (with particular regard to wintering and passage wildfowl) and the potential avoiding the effects of over-abstraction on sensitive sites, habitats and species and consideration of adaptability to construction impacts have been assessed as climate change) and to protect and enhance natural capital minor risk taking account of best practice and the biodiversity and ecosystem services that contribute construction methods. to the economy. Uncertainty surrounds the potential impact from the pipeline construction on various NERC species (birds, great crested newts, bats, otter, water vole, common reptiles, badgers), however best construction methods such as constructing at Large Medium Short term Permanent Low (adverse) Medium (adverse) Minor adverse None certain times in the year (e.g., out of spawning season), or washing construction vehicles should mitigate many of these potential impacts. Impacts from operation of the scheme on the aquatic environment are assessed as negligible.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species (Japanese knotweed, giant fauna hogweed & Himalayan balsam) are known to be present in the areas that would undergo construction. There is a risk of potentially spreading these species through the construction Large Medium Short term Permanent Low (adverse) Medium (adverse) phase. It is assumed that appropriate mitigation Minor adverse None measures will be undertaken to reduce the risk of the spread of invasive species. The operational phase of the scheme poses no risk to the spread of invasive species.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver 10 Ml/d helping health promoting the value of the water environment for health to maintain essential public water supplies during and wellbeing). Large Medium Short term Temporary Low (beneficial) Medium (beneficial) drought conditions and therefore help maintain None Minor beneficial public health.

Population and human 2.2 To protect and enhance opportunities for formal and There are angling activities present in the River health informal recreation. Ouse, however, the negligible flow reduction in Large Medium Short term Temporary Low (adverse) Low (adverse) the watercourse is not anticipated to have an Negligible adverse None impact on the quality of the angling.

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of health communities with good access to the services they need. supply reliability in drought conditions, ensuring a Large Medium Short term Temporary Low (beneficial) Medium (beneficial) resilient supply for customers and economic None Minor beneficial activity. Material assets and 3.1 To reduce, and make more efficient, the domestic, The scheme's construction would involve a resource use industrial and commercial consumption of resources, medium scale consumption of resources and once minimise the generation of waste, encourage its re-use and operational additional chemicals and energy eliminate waste sent to landfill. would be required for water treatment and Large Medium Short term Permanent Medium (adverse) Medium (adverse) Moderate adverse None distribution. To mitigate the adverse effects, resources for construction would be sourced locally where possible. Part 2 of 3

SEA topics and objectives Assessment of option

Water 4.1 To maintain or improve the quality of rivers, lakes, The increased abstraction would have a negligible groundwater, estuarine and coastal waterbodies. impact on flow levels and therefore water quality. The additional flow can only be abstracted when river flows are above the prescribed limit set in the abstraction licence (or drought option if this Large Medium Short term Temporary Low (adverse) Medium (adverse) Minor adverse None has been granted under the drought option option). The WFD status is sensitive to flow level change.

Water 4.2 To avoid adverse impact on surface and groundwater The drought option would have a negligible levels and flows, including when this impacts on habitats impact on surface and groundwater flows in the and/or navigation. impacted reaches (20.4 km), with hydrological Large Medium Short term Temporary Low (adverse) Low (adverse) Negligible adverse None impact on low flows of up to 6.1%.

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils There would be negligible land use changes and to protect and enhance geodiversity. associated with this drought option. There are Large Medium Short term Temporary Low (adverse) Low (adverse) anticipated to be no impacts on geologically Negligible adverse None important sites.

Air and Climate 6.1 To maintain and improve air quality. The construction phase of the new pipeline and additional assets would give rise to dust emissions that could impact nearby sensitive environmental receptors. However, these effects would be minimised through best practice construction methods, as such, the residual effects would only be moderate adverse. During the operational phase of the scheme, Large Medium Short term Temporary Medium (adverse) Medium (adverse) Moderate adverse None there would be increased energy use associated with pumping and treatment processes. There would be a proportional increase in emissions to atmosphere, however, energy would be supplied from the grid so emissions would not be localised.

Air and climate 6.2 To reduce greenhouse gas emissions. The construction phase of the new pipeline and the pumping and treatment processes involved in the operational phase would be associated with Large Medium Short term Temporary Medium (adverse) Medium (adverse) an increase in energy use. This would result in Moderate adverse None moderate adverse effects associated with the increase in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought plan options are a key component of change. Yorkshire Water's Drought Plan. The Plan aims to ensure resilience of water supplies to drought Large Medium Short term Temporary Low (beneficial) Medium (beneficial) None Minor beneficial which may become more prevalent due to climate change. Part 3 of 3

SEA topics and objectives Assessment of option

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, There are no known cultural heritage or Heritage heritage assets and their settings and protect archaeology sites dependent on flows in the River archaeologically important sites. Ouse. There is the potential for cultural heritage or archaeology sites within the vicinity of the Large Medium Short term Temporary Low (adverse) Low (adverse) pipeline route to be impacted. However, assuming Negligible adverse None best practice constructions methods and the implementation of mitigations measures then these impacts would be negligible.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to There are some limited construction impacts on Amenity designated and undesignated landscapes, townscapes and visual amenity anticipated in rural areas of the countryside. agricultural land during river intake and pipeline construction, but this would be a short-term Large Medium Short term Temporary Low (adverse) Medium (adverse) Minor adverse None impact. No other impacts are anticipated during the operation of the scheme. Part 1 of 2

Drought Plan Option Name: Ouse Raw Water Transfer

Drought Plan Option Description: The scheme would utilise the existing Ouse abstraction raw water licences (130 Ml/d peak, 96 Ml/d average). Under this option, raw water abstracted Ouse abstraction would be pumped via a new pipeline to the River Derwent Water Treatment Works 1. Modelling indicates this option would provide an annual average 40Ml/d in a dry year scenario. Use in a drought could be greater depending on water availability in the River Ouse and at other sources supplying River Derwent Water Treatment Works 1. As such, a deployable output of 60Ml/d is assumed for the drought option.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Potential residual effect on sensitive receptors Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ (assuming good practice construction methods) significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) CommentaryJ12:J13 after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The construction of the pipeline has the potential to impact fauna designated sites of nature conservation interest and numerous designated sites through habitat destruction and protected habitats and species (with particular regard to disturbance of susceptible species. However, the adverse effects avoiding the effects of over-abstraction on sensitive sites, would be limited to minor through pipeline route diversion and habitats and species and consideration of adaptability to best practice construction techniques. There are a number of climate change) and to protect and enhance natural capital NERC fish species (Atlantic salmon, European eel, barbel, sea and the biodiversity and ecosystem services that trout, river lamprey, sea lamprey, allis shad, twaite shad) that contribute to the economy. could potentially be impacted by the operation of the scheme. However, the abstraction will be within existing abstraction licence limits which have been reviewed by the Review of Consents process under the Habitats Directive. Impacts are Medium High Short term Permanent Low (adverse) Medium (adverse) Minor adverse None therefore assessed as minor adverse. Impacts on downstream SSSIs near the river reaches are assessed as having a minor impact. Uncertainty surrounds the potential impact from construction on various NERC species (birds, great crested newts, bats, otter, water vole, common reptiles, badgers), but best practice construction activity will mitigate adverse effects.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species (Japanese knotweed, giant hogweed & Himalayan fauna balsam) are known to be present in the areas that would undergo construction. There is a risk of potentially spreading these species through the construction phase. It is assumed that appropriate mitigation measures will be undertaken to reduce the risk of the Medium Moderate Short term Permanent Low (adverse) Medium (adverse) Minor adverse spread of invasive species. The operational phase of the scheme poses no risk to the spread of invasive species.

Population and human 2.1 To protect and improve health and well-being The drought option would provide up to 60 Ml/d helping to health (including promoting the value of the water environment maintain essential public water supplies during drought for health and wellbeing). Medium Moderate Short term Temporary High (beneficial) Medium (beneficial) conditions and therefore help maintain public health. None Major beneficial

Population and human 2.2 To protect and enhance opportunities for formal and Construction of the pipeline has the potential to impact access to health informal recreation. and enjoyment of recreational resources, including access to the Ebor Way National Trail, for which the route of the trail runs alongside the River Ouse.

Medium Moderate Short term Temporary Low (adverse) Low (adverse) There are angling activities present in the River Ouse, however, Negligible adverse None the minor flow reduction in the watercourse is not anticipated to have a significant impact on the quality of the angling in operation.

Material assets and 3.1 To reduce, and make more efficient, the domestic, The scheme's construction (1.6 km pipeline) would involve a small resource use industrial and commercial consumption of resources, scale consumption of resources and once operational additional minimise the generation of waste, encourage its re-use chemicals and energy would be required for water treatment and and eliminate waste sent to landfill. Medium High Short term Temporary Low (adverse) Medium (adverse) distribution. To mitigate the adverse effects, resources for Minor adverse None construction would be sourced locally where possible.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Potential residual effect on sensitive receptors Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Topic Objective or population affected effect (permanent/ receptor (low/ medium/ (assuming good practice construction methods) significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) (small/medium/large) temporary) high) CommentaryJ12:J13 after reasonable mitigation) after reasonable mitigation)

Water 4.1 To maintain or improve the quality of rivers, lakes, The drought option in combination with a sewage treatment groundwater, estuarine and coastal waterbodies. works (STW) downstream in the Ouse could pose a risk of water quality deterioration. The drought option abstraction could reduce river flow available to dilute the effluent which could lead Medium Moderate Short term Temporary Medium (adverse) Medium (adverse) to an increase in total ammonia and BOD contributions of 7% Moderate adverse None from Ouse STW 1 at summer low flow. There is one significant flow pressure (a Hydropower Station) at the bottom of the reach.

Water 4.2 To avoid adverse impact on surface and groundwater The hydrological impact on low flows (up to 14.6%) would be levels and flows, including when this impacts on habitats moderate adverse across the impacted reaches of the Ouse (11.7 and/or navigation. km). The associated reduction in wetted width and depth could Medium Moderate Short term Temporary Low (adverse) Medium (adverse) Minor adverse None potentially impact habitats hydrologically connected to the River Ouse. The flow reduction would have no impact on navigation.

Water 4.4 To promote water efficiency and measures that enable No opportunities to promote long-term improvement in water sustainable water use. N/A N/A N/A N/A N/A N/A efficiency have been identified for this option. None None Soil, geology and land use 5.1 To protect and enhance the quality and quantity of The small amount of land required to accommodate the new soils and to protect and enhance geodiversity. pipeline would have negligible adverse effects on land use and it is Medium Moderate Short term Temporary Low (adverse) Low (adverse) anticipated that there would be no impact on geologically Negligible adverse None sensitive sites. Air and Climate 6.1 To maintain and improve air quality. The construction phase of the new pipeline and additional assets would give rise to dust emissions that could impact nearby sensitive environmental receptors. However, these effects would be minimised through best practice construction methods, as such, the residual effects would only be minor adverse. During the operational phase of the scheme, there would be Medium Moderate Short term Temporary Low (adverse) Medium (adverse) Minor adverse None increased energy use associated with pumping and treatment processes. There would be a proportional increase in emissions to atmosphere, however, energy would be supplied from the grid so emissions would not be localised.

Air and climate 6.2 To reduce greenhouse gas emissions. The construction phase of the new pipeline and the pumping and treatment processes involved in the operational phase would be associated with an increase in energy use. This would result in Medium Moderate Short term Temporary Low (adverse) Medium (adverse) minor adverse effects associated with the increase in greenhouse Minor adverse None gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought measures are a key component of Yorkshire Water's change. Medium Moderate Short term Temporary Low (beneficial) Medium (beneficial) Drought Plan. The Drought Plan aims to ensure resilience of water None Minor beneficial supplies to drought.

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No known water-dependent cultural heritage or archaeology sites Heritage heritage assets and their settings and protect are located within or adjacent to the impacted reaches. There archaeologically important sites. would be negligible construction impacts assessed for other cultural heritage or archaeology sites located in the vicinity of the Medium High Short term Temporary Low (adverse) Low (adverse) scheme, including two SAMs (the Nether Poppleton medieval Negligible adverse None moated site and York Minster Cathedral precinct) and the Roman camp on Clifton Moor, with good construction practices adopted.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access Some limited construction impact on visual amenity towards Amenity to designated and undesignated landscapes, townscapes features including the a Park (located within 250m of the and the countryside. proposed pipeline), during river intake and pipeline (1.6km) Medium High Short term Temporary Low (adverse) Medium (adverse) construction, but this would be localised and short-term impact. Minor adverse None No other impacts are anticipated during operation of the scheme. Part 1 of 2

Drought Plan Option Name: Ouse water treatment works extension

Drought Plan Option Description: This option involves the construction of additional water treatment capacity at Ouse WTW to enable YWSL to abstract water from the River Ouse up to the limit of the abstraction licence. The licence allows for Ouse abstraction of 96Ml/d average and 130Ml/d peak. This option enables an additional 22Ml/d average yield (with an additional 25Ml/d average abstracted) and 40Ml/d maximum yield (with an additional 45Ml/d maximum additional abstraction). The scheme also includes the construction of a new river intake on the River Ouse.

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Biodiversity, flora and 1.1 To conserve and enhance biodiversity, including The construction phase of the scheme would result in adverse effects fauna designated sites of nature conservation interest and on designated sites in proximity to new treatment works. Uncertainty protected habitats and species (with particular regard to surrounds the potential impact from construction on various NERC avoiding the effects of over-abstraction on sensitive sites, species (fish, birds, great crested newts, bats, otter, water vole, habitats and species and consideration of adaptability to common reptiles, badgers). Best practice construction methods would climate change) and to protect and enhance natural capital also be implemented to further reduce residual effects on and the biodiversity and ecosystem services that contribute environmental receptors. As such, the construction phase of the to the economy. scheme would only have minor adverse impacts on biodiversity, flora and fauna. The operational phase of the scheme would result in adverse effects on Medium High Short term Permanent Low (adverse) Medium (adverse) designated sites and NERC species (Atlantic salmon, European eel, Minor adverse None barbel, sea trout, river lamprey, sea lamprey, allis shad, twaite shad) hydrologically connected to the impacted reaches of the drought option. However, the abstraction will be within existing abstraction licence limits which have been reviewed by the Review of Consents process under the Habitats Directive. Potential impacts are therefore considered to be minor adverse.

Biodiversity, flora and 1.2 To avoid introducing or spreading INNS. Invasive species (Japanese knotweed, giant hogweed & Himalayan fauna balsam) are known to be present in the areas that would undergo construction. There is a risk of spreading these species through the construction phase. It is assumed that appropriate mitigation measures will be undertaken to reduce the risk of the spread of invasive species. Medium Moderate Short term Permanent Low (adverse) Medium (adverse) The operational phase of the scheme poses no risk to the spread of Minor adverse None invasive species.

Population and human 2.1 To protect and improve health and well-being (including The drought option would deliver 22 Ml/d (average)/ 40Mld health promoting the value of the water environment for health (maximum), helping to maintain essential public water supplies during and wellbeing). drought conditions and therefore help maintain public health and well- being. Medium Moderate Short term Temporary High (beneficial) Medium (beneficial) None Major beneficial

Population and human 2.2 To protect and enhance opportunities for formal and There are angling activities present in the River Ouse, however, the health informal recreation. minor flow reduction in the watercourse is not anticipated to have a Medium Moderate Short term Temporary Low (adverse) Low (adverse) significant impact on the quality of the angling. Negligible adverse None

Population and human 2.3 To promote a sustainable economy and thriving The option will contribute to the maintenance of supply reliability in communities with good access to the services they need. drought conditions, ensuring a resilient supply for customers and health Medium Moderate Short term Temporary High (beneficial) Medium (beneficial) None Major beneficial economic activity.

Material assets and 3.1 To reduce, and make more efficient, the domestic, The scheme's construction (new treatment works) would involve a resource use industrial and commercial consumption of resources, medium scale consumption of resources and once operational minimise the generation of waste, encourage its re-use and additional chemicals and energy would be required for water treatment eliminate waste sent to landfill. Medium High Short term Temporary Medium (adverse) Medium (adverse) and distribution. To mitigate the adverse effects, resources for Moderate adverse None construction would be sourced locally where possible.

Material assets and 3.2 To promote efficient water resource management and No opportunities to promote the sustainable management of natural resource use the sustainable management of natural resources, ensuring resources have been identified for this option. water supply for homes and industry in the area is N/A N/A N/A N/A N/A N/A None None maintained. Water 4.1 To maintain or improve the quality of rivers, lakes, The drought option in combination with a sewage treatment works groundwater, estuarine and coastal waterbodies. (STW) could pose a risk of water quality deterioration. The drought option abstraction could reduce river flow available to dilute the effluent which could lead to an increase in total ammonia and BOD Medium Moderate Short term Temporary Medium (adverse) Medium (adverse) Moderate adverse None contributions of 7% from Ouse STW 1 at summer low flow.

Water 4.2 To avoid adverse impact on surface and groundwater The hydrological impact on low flows across the impacted reaches (11.7 levels and flows, including when this impacts on habitats km) would be minor adverse. This change in flow (up to 10.9%) would and/or navigation. reduce the wetted width and depth and potentially have an impact on Medium Moderate Short term Temporary Low (adverse) Medium (adverse) habitats hydrologically connected to the River Ouse. The minor flow Minor adverse None reduction would have no impact on navigation. Part 2 of 2

SEA topics and objectives Assessment of option

Scale of effect: geographical &/ Permanence of Value/ sensitivity of Residual adverse effect Residual beneficial effect Certainty of effect Short-term/ medium- Magnitude of effect Potential residual effect on sensitive receptors (assuming Topic Objective or population affected effect (permanent/ receptor (low/ medium/ significance (likely to remain significance (likely to remain (low/ moderate/ high) term/ long-term (low/ medium/ high) good practice construction methods) Commentary (small/medium/large) temporary) high) after reasonable mitigation) after reasonable mitigation)

Soil, geology and land use 5.1 To protect and enhance the quality and quantity of soils The small amount of land required to accommodate the new treatment and to protect and enhance geodiversity. works would have negligible adverse effects on land use and it is Medium Moderate Short term Temporary Low (adverse) Low (adverse) anticipated that there would be no impact on geologically sensitive Negligible adverse None sites. Air and Climate 6.1 To maintain and improve air quality. The construction phase of the new WTW and associated infrastructure would give rise to dust emissions that could impact nearby sensitive environmental receptors. However, these effects would be minimised through best practice construction methods, as such, the residual effects would only be minor adverse. During the operational phase of the scheme, there would be increased Medium Moderate Short term Temporary Medium (adverse) Medium (adverse) energy use associated with pumping and treatment processes. There Moderate adverse None would be a proportional increase in emissions to atmosphere, however, energy would be supplied from the grid so emissions would not be localised.

Air and climate 6.2 To reduce greenhouse gas emissions. The construction phase of the new treatment works and the treatment processes involved in the operational phase would be associated with Medium Moderate Short term Temporary Medium (adverse) Medium (adverse) an increase in energy use. This would result in minor adverse effects Moderate adverse None associated with the increase in greenhouse gas emissions.

Air and climate 6.3 To consider the need for adaptive measures for climate Drought plan options are a key component of Yorkshire Water's change. Drought Plan. The Plan aims to ensure resilience of water supplies to Medium Moderate Short term Temporary Low (beneficial) Medium (beneficial) None drought which may become more prevalent due to climate change. Minor beneficial

Archaeology and Cultural 7.1 To conserve and enhance the historic environment, No known water-dependent cultural heritage or archaeology sites are Heritage heritage assets and their settings and protect located within or adjacent to the impacted reaches. Potential impacts archaeologically important sites. on other cultural heritage or archaeology sites due to the construction Medium High Short term Temporary Low (adverse) Low (adverse) phase of the scheme would be negligible as appropriate mitigation Negligible adverse None measures would ensure that assets are not impacted.

Landscape and Visual 8.1 To protect, enhance the quality of and improve access to The construction of the new treatment works would have a temporary Amenity designated and undesignated landscapes, townscapes and minor adverse impact on visual amenity of the surrounding countryside, the countryside. however, permanent impacts are considered to be negligible when accounting for appropriate design and visual screening. The impact on Medium High Short term Temporary Low (adverse) Medium (adverse) Minor adverse None the natural flow regime in the impacted water courses would not be perceptible.