Floodsmart Plus Ref 65590R1 T

Flood Smart Plus

Site address Aver House Nursery Road Waltham Abbey EN9 2JE

Site coordinates 538661, 206404

Report prepared for DPA (London) Ltd 25 Tudor Hall Brewery Road Hoddesdon Herefordshire EN11 8FP

Report reference 65590R1

Report status Final report

Date issued July 2017

Report author Jessica Bayliff Consultant Report checker Mike Piotrowski Project Consultant Report reviewer Bob Sargent Associate Consultant

GeoSmart Information Ltd New Zealand House t. +44(0)1743 276150 160 Foregate e. [email protected] Shrewsbury SY2 6FD www.geosmartinfo.co.uk

Registered office: New Zealand House, 160 Abbey Foregate, Shrewsbury SY2 6FD. Registered in England and Wales, number 5475394.

1. Executive summary

The National Planning Policy Framework (2012) and Planning Practice Guidance (2015) requires that flood risk assessments review flooding from all potential sources. A review has been undertaken of national environmental data sets to assess the potential flood risk to the Site. The review is provided within this concise interpretative report written by an experienced GeoSmart flood risk consultant. Site analysis

Source of Flood risk Baseline After Mitigation

River and coastal Moderate Low

Surface water (pluvial) flooding Low to Very Low Very Low

Groundwater flooding Moderate Low

Other flood risk factors present No N/A

Is any other further work Yes (Please Yes recommended? see below)

N/A = mitigation not required

The proposed development will comprise the change of use from an existing storage building to a residential dwelling.

According to the Environment Agency’s Flood Map for Planning Purposes, the Site is located within fluvial Flood Zone 2.

As the Site is located within Flood Zone 2, modelled flood data was obtained from the Environment Agency to confirm the flood levels at the Site. Further analysis of the modelled flood level data, including the most up to date guidance on the allowance for climate change, confirms the 1 in 100 year plus a 35% Climate Change allowance flood level at the site to be 25.67 mAOD. A comparison of the Site specific topographic survey (SJ Geomatics ,2017) and both modelled and estimated flood levels, indicate flood flows in all events up to the 1 in 1000 year event would not impact the Site. Flood depths during the 1 in 1000 year event within Nursery Road, outside of the Site boundary, would be 0 and 0.1m. Although the areas of the Site proposed for development would not be impacted. According to the Environment Agency’s Risk of Flooding from Surface Water mapping, parts of the Site to the north and the east are at low risk of pluvial flooding however the majority

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of the Site is at very low risk of pluvial flooding. According to GeoSmart’s Groundwater (GW5) Flood Risk Mapping, the Site is also at moderate risk of groundwater flooding, due to the underlying permeable superficial geology, in response to river events. The Site is not at risk of Reservoir Flooding. Recommendations • It is recommended that minimum floor levels for the Site are set no lower than 26.27 mAOD. Where raising the finished floor levels within the majority of the development cannot be achieved, flood resistance measures such as barriers for flood depths are recommended up to 0.3m. • Resilience measures such as raising electrical sockets, tiling or using a similar waterproof material for the development floor and non-return flap valves should be considered for any proposed foul and surface water discharge pipes. • A Sustainable Drainage scheme should be considered for the Site and specific groundwater measures should be implemented on the Site. We recommend that mitigation measures that have been discussed within this report are considered as part of the proposed development where possible and evidence of this is provided to the Local Authority as part of the planning application.

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2. Introduction

Background and purpose This assessment has been undertaken by firstly compiling information concerning the Site and the surrounding area. The information which is gathered is then used to construct a ‘conceptual site model’, including an understanding of the appropriateness of the development as defined in the NPPF (2012) and the source(s) of any flood risk present. Finally, a preliminary assessment of the steps that can be taken to manage any flood risk to the development is undertaken.

This report has been prepared with reference to the National Planning Policy Framework (NPPF, 2012).

“The National Planning Policy Framework set out the Government’s planning policies for England and how these are expected to be applied” (NPPF, 2012).

The National Planning Policy Framework promotes a sequential, risk based approach to the location of development.

“This general approach is designed to ensure that areas at little or no risk of flooding from any source are developed in preference to areas at higher risk. The aim should be to keep development out of medium and high risk flood areas (Flood Zones 2 and 3) and other areas affected by other sources of flooding where possible” (NPPG, 2014).

The purpose of this report is to provide clear and pragmatic advice regarding the nature and potential significance of flood hazards which may be present at the Site.

Report scope A thorough review of a commercially available flood risk report and Environment Agency supplied data indicating potential sources of flood risk to the Site from rivers and coastal sources, surface run-off (pluvial), groundwater and reservoirs, including historical flood information and modelled flood extent. Appropriate measures are recommended to manage and mitigate the flood risk to the property.

Local rainfall data for the 1 in 100 year rainfall event is used to support site run-off calculations if there is an increase in impermeable area as a result of the development. The effects of climate change are also included in these calculations, using industry standard advice.

Information obtained from the Environment Agency and a review of Epping Forest District Council Level 1 Strategic Flood Risk Assessment (SFRA) (URS, 2015) is used to ascertain local flooding issues and, where appropriate, identify information to support a Sequential and/or Exception test required as part of the National Planning Policy Framework (NPPF, 2012).

Using the available data the existing and future flood risks to and from the Site from all flood sources will be assessed in line with current best practice.

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An indication of potential flood risk from the Site to downstream receptors is provided where the proposed development increases run-off from the Site.

Report limitations It is noted that the findings presented in this report are based on a desk study of information supplied by third parties. Whilst we assume that all information is representative of past and present conditions we can offer no guarantee as to its validity and a proportionate programme of site investigations would be required to fully verify these findings.

This report excludes consideration of potential hazards arising from any activities at the Site other than normal use and occupancy for the intended land uses. Hazards associated with any other activities have not been assessed and must be subject to a specific risk assessment by the parties responsible for those activities.

Datasets The following table shows the sources of information that have been consulted as part of this report:

Datasets consulted

Thames Commercial Environment Source of flooding Water Flood Report SFRA* Agency OS Data (Appendix (Appendix B) (Appendix C) D)

Historical X X X

Fluvial/tidal X X X

Surface water X X X (pluvial)

Groundwater X X

Sewer X X

Culvert/bridges X X

Reservoir X X

*Epping Forest District Council Level 1 Strategic Flood Risk Assessment (SFRA) (URS, 2015) *Supporting information on the datasets used is provided in the relevant appendix

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3. Site analysis

Site information The Site is located in Lower Nazing in a setting of commercial and residential land use, National Grid Reference TL 38661 06404 (see Figure 1). According to OS data the immediate area surrounding the Site is relatively flat between 20 - 30 mAOD. Using a 1 km buffer around the Site, it is noted that to the north land falls between 20-25 mAOD. To the west land remains between 20-30 mAOD, to the east land rises between 45-50 mAOD and to the south is between 25-30 mAOD.

The general level of the Site is between 25.13 and 25.95 mAOD with the Site falling gradually in an easterly direction. This is based on EA elevation data obtained for the Site to a 1m resolution with a vertical accuracy of ±150 mm. Site plans and drawings are provided in Appendix A.

Figure 1 Site Location

Contains Ordnance Survey data © Crown copyright and database right 2017

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Development The Site is currently used as a storage unit. The proposed development will comprise the change of use of the building to a residential dwelling. The effect of the overall development will result in an increase in number of occupants and/or users of the building and will result in the change of use, nature or times of occupation. The estimated lifespan of the development is 100 years.

Hydrological features Watercourses/surface water features within 1km of the Site: There is a drain located approximately 10 m east of the Site. There are multiple ponds within 1km, the closest is located approximately 70 m north west of the Site. There is a Flood Relief Channel approximately 395 m west of the Site. Nazeing Meads Lakes are located approximately 430 m north west at the closest point. The River Lee Navigation is located approximately 720 m north west of the Site. The River Les is located approximately 830m north west of the Site. Potential overland flow routes to the Site could exist from the south east and east. Potential overland flow routes from the Site could exist to the north east.

Proximity to relevant infrastructure: There is a small culvert on the drain approximately 65 m north east of the Site. There is a bridge on the Flood Relief Channel approximately 375 m west of the Site. There is a bridge over the Flood Relief Channel on Nazeing New Road approximately 585 m south west of the Site. There is another bridge over the Flood Relief Channel approximately 925 m south west of the Site. There is a bridge over the River Lee Navigation approximately 800 m north west of the Site. There is a bridge over the River Lee navigation on Nazeing New Road approximately 860 m north west of the Site. There is a bridge on Meadgate Road over the join between two of the Nazeing Meads Lakes approximately 975 m north east of the Site.

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Hydrogeological features British Geological Survey mapping indicates that the underlying superficial geology consists of Alluvium (BGS, 2017) and is classified as a Secondary A Aquifer (EA, 2017).

British Geological Survey mapping indicates that the underlying bedrock geology consists of the Lambeth Group (BGS, 2017) and is classified as a Secondary A Aquifer (EA, 2017)

The Site is not located within a Source Protection Zone (EA, 2017).

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4. Flood risk to the development

Historical flood events Historic flood events have been recorded at the Site (EA, 2017)(URS, 2015). According to the Environment Agency’s mapping, the Site was affected by flooding in December 2000 due to the channel capacity being exceeded (no raised defences). Mapping confirms the Site was not affected by the March 1947 flood event, which occurred due to the channel capacity being exceeded, but the area approximately 60m to the south was affected during this event. Historic mapping confirms that Nursery Road to the south would be impacted first in a large event, but access to and from the Site would still be available north along Nursery Road from the Site.

Guidance

The purpose of historic flood data is to provide information on where and why flooding may have occurred in the past. The absence of any recorded events does not mean that flooding has never occurred on Site or that flooding will never occur at the Site.

Fluvial/coastal flood risk According to mapping and data provided by the Environment Agency (Figure 2), the Site is located within Flood Zone 2 and is therefore classified as being at moderate risk.

The extent of Flood Zone 2 within the vicinity of the Site is comprised of the 1 in 1000 year modelled extent and the extent of historic flooding.

However, it should be noted that the Site is only partially impacted by the 1 in 1000 year modelled extent (in the east of the Site); but the entire Site is affected by the mapped extent of historic flooding.

The Site is protected by flood defences and is not within an area considered as the functional floodplain.

According to the EA’s Risk of Flooding from Rivers and the Sea mapping, which considers the crest height, standard of protection and condition of defences; confirms the flood risk from Rivers and the Sea is Moderate.

The Site lies approximately 400 m to the south west of the nearest land outside Flood Zones 2 and 3.

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As defined in the NPPF (2012): Guidance Ignoring the presence of any defences, land located in a Flood Zone 2 is considered to be at medium risk of flooding, with between a 1 in 100 and 1 in 1000 annual probability of fluvial flooding or between a 1 in 200 and 1 in 1000 annual probability of coastal flooding in any one year. Development of “Water-Compatible”, “Essential Infrastructure”, “Less Vulnerable” and “More Vulnerable” land uses are suitable for this zone with “Highly Vulnerable” land uses requiring an Exception Test to be passed prior to development taking place (see glossary for terminology).

Model data As the Site is located within the EA’s modelled fluvial flood plain, EA flood elevation data was obtained. Model data provided by the EA was undertaken before SFRA was published and as the SFRA does not contain more detailed modelled flood levels, the EA’s data is deemed the best available, therefore this data has been used in this report.

The EA provided both 1D in-channel node results (flood levels and flows) and 2D floodplain results (flood levels). The 2D results have been used in preference to the 1D Node results, as these have consider flow routes to the Site from the main channel. All of the data provided by the EA is in reference to a defended scenario.

Defended

2D floodplain Results: Flood Levels (mAOD)

• 1 in 100 year modelled flood level: 25.58m AOD • 1 in 100 year + 20% Climate Change modelled flood level: 25.66m AOD • 1 in 1000 year modelled flood level: 25.69m AOD

The Environment Agency’s mapping confirms that the Site would only be affected by flooding in the 1 in 1000 year modelled flood event. The flood flow route onto the Site in this event originates from the southeast, crossing Nursery Road and flowing into the Site. The 1 in 100, 1 in 100 year plus 20% climate change and the 1 in 200 year modelled extents are mapped adjacent to the Site but do not encroach onto the Site itself.

Comparison of the EA’s mapping and the topographic survey (SJ Geomatics, June 2017) obtained for the Site, confirms that Nursery Road is located at levels around 26.0 to 26.3m AOD, rising northwards. The ground levels in the Site itself within the southeast and east of the Site range from between 25.76 to 25.96 mAOD. Thus, Nursery Road and ground levels on the Site are likely to create a barrier to flows, preventing flooding occurring on the Site in all modelled events up to and including the 1 in 1000 year event.

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Guidance Model data taken from River Lee 2D Modelling Study, completed in 2014 by CH2M Hill. Data received from the EA is shown in Appendix C.

Climate Change factors In accordance with National DeFRA guidance (March, 2016), the Central and Higher Central allowances should be used to provide a suitable climate change factor for ‘more vulnerable’ development located within Flood Zone 2. The allowances in this instance are +25% and +35% for 2115 within the Thames catchment. Due to recent changes in guidance on the allowances for climate change, the 20% increase in river flows should no longer to be used for development design purposes.

Based on the updated guidance, ‘More Vulnerable’ developments are required to undertake a Basic assessment approach. The effect the climate change increase has on flood levels is based on a stage / discharge relationship graph (Appendix C) (EA, 2016).

For the Thames Region, the 1 in 1000 year event flow is approximately 60% greater than the 1 in 100 year flow, therefore the following flood levels

• 1 in 100 year + 25% Climate Change modelled flood level: 25.65 mAOD • 1 in 100 year + 35% Climate Change modelled flood level: 25.67 mAOD Appendix B confirms the method used to calculate the 1 in 100 year + 25% and 35% allowance for Climate Change modelled flood extent within the vicinity of the Site. A comparison of the flood levels and the topographic survey confirms that ground levels in the southeast of the Site and along Nursery Road, ranging from 25.76 to 26.03 mAOD are likely to block any flows up to and including the modelling 1 in 1000 year and estimated 1 in 100 year plus 35% allowance for climate change, placing the Site outside of these flood extents.

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Flood defences

Guidanc e Sites that are located close to flood defences are likely to be zones where rapid inundation will occur in the event of the flood defences being overtopped or breached. A Site located close to flood defences (within 250m) may require a more detailed FRA subject to local topography.

• There are no areas benefiting from flood defences within 25 m of the centre of the study site. • There are no formal flood defences within 250 m of the Site. • There are no proposed flood defences within 250 m of the Site.

There are flood defences located 380 m of the Site which offer some protection to the Site but as they are not in close proximity, they will not reduce the overall flood risk to the Site.

Information from the Environment Agency relating to the defences is outlined below.

• According to the Environment Agency (2016a) the flood defences in place for this area are designed to defend up to a 1 in 50 year flood event.

• The defence is a vegetated earth embankment with prolific self-set vegetation with steel sheet piling to the mid-section. The defence has a minimum crest level of 23.26 mAOD (Appendix C).

• The Environment Agency has classified the current condition as “fair”.

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Figure 2 Environment Agency (EA) Flood Map for Planning (EA, 2017)

Contains Ordnance Survey data © Crown copyright and database right 2017 Environment Agency copyright and database rights 2017

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Surface water (pluvial) flooding The Site is considered to be at low to very low risk of surface water pluvial flooding (Figure 3). As the 1 in 100 year surface water mapping does not consider climate change, the 1 in 1000 year mapping has been used to assess flood risk from surface water to reflect the potential increase in risk due to climate change. The 1 in 1000 year mapping indicates there are areas of the Site towards the north and eastern boundary at low risk of surface water flooding where depths could range between 0m to 0.3m above ground level on areas of the Site which have an elevation of under 25.76 mAOD.

Figure 3 Environment Agency (EA) Surface Water Flood Risk Map (EA, 2017)

Contains Ordnance Survey data © Crown copyright and database right 2017 Environment Agency copyright and database rights 2017

The SFRA does not indicate reported incidents of surface water flooding within 100 m of the Site (URS, 2015). The SFRA does not indicate if there are any Critical Drainage Areas (CDA) within the district (URS, 2015).

Based on inspection of OS data, the Site is located on a potential overland flow route and contains some areas of low topography in relation to the surrounding area. However;

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review of the site plans indicates overland flows are not obstructed and occur across none essential areas of the site. Localised depressions and accumulations cover a very small area of the site in none essential areas.

Guidance

According to EA’s surface water flood risk map, a site at very low risk has a chance of flooding of less than 1 in 1000 (0.1%)

According to EA’s surface water flood risk map, a site at low risk has a chance of flooding of between a 1 in 1000 and 1 in 100 (0.1% and 1%).

Groundwater flooding Based on GeoSmart’s Groundwater Flood Risk Map (Figure 4) the Site is considered to be at moderate risk of groundwater flooding. The SFRA however does not indicate reported incidents of ground water flooding within 20 m of the Site (URS, 2015).

The main mechanisms of groundwater flooding at the Site are related to flooding via permeable Superficial Deposits potentially in response to river and tidal events. The Site is unlikely to be at risk of Bedrock or Clearwater flooding relating to prolonged recharge and a rise in the water table.

It is noted that groundwater flooding may occur in response to prolonged high river levels even if overtopping of flood defences does not occur.

The risks may be higher for basements and below ground structures and as such mitigation measures such as sumps and pumps may be required.

Guidance According to GeoSmart (2017) there is a moderate risk of groundwater flooding in this area with a return period of 1 in 100 years.

Moderate Risk - There will be a significant possibility that incidence of groundwater flooding could lead to damage to property or harm to other sensitive receptors at, or near, this location.

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Figure 4 GeoSmart GW5 Groundwater Flood Risk Map (GeoSmart, 2017)

Contains Ordnance Survey data © Crown copyright and database right 2017

Sewer flooding Records held by Thames Water indicate that there have been no incidences of flooding related to the surcharging of public sewers at the Site (Thames Water, 2017; Appendix D). The SFRA has identified incidences of flooding due to drainage within the EN9 2 postcode. However, it has been recognised that this four digit postcode covers a large area and street level detail has not been included (URS, 2015). The SFRA confirms there are no records held by Epping Forest District Council of sewer flooding incidences on the Site (URS, 2015).

Guidance Properties classified as “at risk” are those that have suffered, or are likely to suffer, internal flooding from public foul, combined or surface water sewers due to overloading of the sewerage system either once or twice in the ten year reference period (Thames Water, 2017). Records held by Thames Water provide information relating to reported incidents, the absence of any records does not mean that the Site is not at risk of flooding.

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Culverts and bridges Culverts and bridges have been identified within 1 km of the Site. However these structures are a significant distance from the Site and are unlikely to represent a flood risk to the Site in the event of a blockage. The SFRA has not identified any historic drainage issues within the Site area (URS, 2015).

Reservoir flooding According to the Environment Agency’s Risk of Flooding from Reservoir mapping the Site is not at risk of flooding from reservoirs (EA, 2017)

Guidance

The risk of reservoir flooding is related to the failure of a large reservoir (holding over 25,000 m3 of water) and is based on the worst case scenario. Reservoir flooding is extremely unlikely to occur (Environment Agency, 2017c).

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5. Flood risk from the development

Floodplain storage As the development is located within Flood Zone 2 and would not be impacted during events up to and including the 1 in 100 year plus the maximum (35%) allowance for climate change, compensation for any loss in floodplain storage will not be required.

Drainage and run-off As the proposed development is a conversion, there will not be increase of impermeable surfaces at the Site. However, an estimation of run-off is recommended to permit effective site water management and prevent any increase in flood risk to off-site receptors from the Site.

Guidance included within the National Planning Policy Framework (NPPF) recommends that the effects of climate change are incorporated into Flood Risk Assessments (Flood Risk Assessments: Climate Change Allowances Guidance, 2016). As the proposed development is being changed to residential, the lifespan of the development and requirements for climate change should allow up to the 2115 scenario.

Applies across all Total potential change Total potential Total potential of England anticipated for 2010 change anticipated change anticipated to 2039 for 2040 to 2059 for 2060 to 2115 Upper end 10% 20% 40%

Central 5% 10% 20%

A method of investigating the run-off due to the proposed development can be calculated by multiplying the run-off per square metre by the impermeable area within the proposed development plan.

It is recommended that attenuation of run-off is undertaken on site to compensate for proposed increases in impermeable surface areas. Attenuation may comprise the provision of storage within a sustainable drainage system.

A list of SuDS components that could be used to manage surface water run-off from the Site are listed in the following table. Alternative SUDs components may also be considered and more information can be found at http://www.susdrain.org/. Always seek expert advice on the selection and sizing of the SuDS components most suitable for your Site.

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Option Description

Rainwater Rain water harvesting can collect run-off from the roofs for use in non- harvesting potable situations, using water butts for example.

Green roof Having part/all of the roof as a green roof covered in vegetation can intercept and store a proportion of the rainfall to result in an overall reduction in the amount of surface water run-off generated from a building structure. They comprise a substrate (growth medium) layer which can be seeded with specially selected plants suitable for the local climatic conditions. Beneath the growth medium is a geotextile filter layer which filters out the substrate from entering the aggregate/geo-composite drainage layer below. At the very bottom of the green roofing, a waterproof membrane protects the roof structure below.

Permeable Permeable pavements can be used for driveways, footpaths and parking paving areas to increase the amount of permeable land cover. Suitable aggregate materials (angular gravels with suitable grading as per CIRIA, 2007) will improve water quality due to their filtration capacity. Plastic geocellular systems beneath these surfaces can increase the void space and therefore storage but do not allow filtration unless they are combined with aggregate material and/or permeable geotextiles.

Swales Shallow, wide and vegetated channels that can store excess run-off whilst removing any pollutants.

Soakaways An excavation filled with gravel within the Site. Surface water run-off is piped to the soakaway.

Attenuation Dry basin or a permanent pond that is designed to hold excess water basins/pond during a rainfall event.

GeoSmart could provide an outline drainage strategy separately, through a SuDSmart Pro report.

It is assumed that any changes to the existing drainage system will be undertaken in accordance with best practice and that care will be taken to ensure the new development does not overload/block any existing drainage or flow pathways to/from the Site. Based on the topography and low to very low surface water flood risk in the vicinity interference with overland flow paths is considered unlikely.

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6. Suitability of the proposed development

The information below outlines the suitability of the proposed development in relation to national and local planning policy.

National The aims of the national planning policies are achieved through application of the Sequential Test and in some cases the Exception Test.

Guidance Sequential test: The aim of this test is to steer new development towards areas with the lowest probability of flooding (NPPF, 2012). Reasonably available sites located in Flood Zone 1 should be considered before those in Flood Zone 2 and only when there are no reasonably available sites in Flood Zones 1 and 2 should development in Flood Zone 3 be considered.

Exception test: In some cases this may need to be applied once the sequential test has been considered. For the exception test to be passed it must be demonstrated that the development provides wider sustainability benefits to the community that outweigh flood risk and a site-specific FRA must demonstrate that the development will be safe for its lifetime taking account of the vulnerability of its users, without increasing flood risk elsewhere, and, where possible, will reduce flood risk overall.

Suitability of the proposed development, and whether an Exception Test is required, is based on the flood zone the Site is located in and the flood risk vulnerability classification of the Site (Table overleaf).

This development is classified as 'more vulnerable' and is located within Flood Zone 2.

However, the application is considered to be a ‘Change of Use’ from commercial to residential.

Paragraph 104. of the NPPF states: “For individual developments on sites allocated in development plans through the Sequential Test, applicants need not apply the Sequential Test. Applications for minor development and changes of use should not be subject to the Sequential or Exception Tests but should still meet the requirements for site-specific flood risk assessments. (Except for any proposal involving a change of use to a caravan, camping or chalet site, or to a mobile home or park home site, where the Sequential and Exception Tests should be applied as appropriate)” (NPPF, 2012).

Therefore, as the development is considered to be a “change of use”, it is not subject to the Sequential Test or an Exceptions Test.

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Table: Flood risk vulnerability and flood zone ‘compatibility (taken from NPPF, 2012)

Flood risk Essential Water Highly More Less vulnerability infrastructure compatible vulnerable vulnerable vulnerable classification

Zone 1 – ✓ ✓ ✓ ✓ ✓ low probability

Zone 2 – ✓ ✓ Exception ✓ ✓

medium test probability required

Zone 3a – Exception test ✓ X Exception ✓

Flood Zone Flood high required test probability required

Zone 3b – Exception test ✓ X X X functional required floodplain

Local For this report, the Epping Forest District Council Level 1 SFRA has been consulted. The SFRA was undertaken by (URS, 2015). Relevant information contained in this report for the Site area is outlined below:

• The Lee Navigation, Old River Lee and Lee Flood Relief Channel (FRC) flow along the western boundary of the district and the River Lee’s catchment occupies the western one third of the district.

• Fluvial flood incidents were identified form the Epping Forest District Council records.

• Surface water flood incidents were primarily identified from Epping Forest District Council and Essex County Council records.

• For the purpose of the flood incidents mapping, ‘Highways’, ‘Storm’, ‘Runoff from adjacent land’ and ‘Runoff from land/TWUL sewer’ were grouped together and classified as surface water flooding.

• The DG5 sewer flooding recorded were provided by the Thames Water Utilities Limited (TWUL). Flood incident records are not provided to street level data, instead grouped into 4 digit post code areas.

• The records of groundwater flooding were provided by the Environment Agency. The records were provided with coordinates

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Guidance

Strategic Flood Risk Assessments are carried out by local authorities, in consultation with the Environment Agency, to assess the flood risk to the area from all sources both now and in the future due to climate change. They are used to inform planning decisions to ensure inappropriate development is avoided (NPPF, 2012).

Environment Agency pre-application response: The Environment Agency (2017b) was contacted as part of this FloodSmart report (Appendix C).

However, a response was not received within the timeframe of this report.

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Flood Risk Standing Advice for Sites located in Flood Zones 2 or 3 For all relevant vulnerable developments (i.e. more vulnerable, less vulnerable and water compatible), advice on the points should be followed: • Surface water management; • Access and evacuation; and • Floor levels. Surface water management Plans for the management of surface water need to meet the requirements set out in either the local authority’s: • Surface water management plan where available; OR • Strategic flood risk assessment. They also need to meet the requirements of the approved building regulations Part H: drainage and water disposal. Read section H3 rainwater drainage. Planning permission is required to use a material that can’t absorb water (e.g. impermeable concrete) in a front garden larger than 5 square metres. Access and evacuation Details of emergency escape plans should be provided for any parts of a building that are below the estimated flood level: Plans should show: • Single storey buildings or ground floors that don’t have access to higher floors can access a space above the estimated flood level, e.g. higher ground nearby; • Basement rooms have clear internal access to an upper level, e.g. a staircase; • Occupants can leave the building if there’s a flood and there’s enough time for them to leave after flood warnings. Floor levels The following should be provided: • Average ground level of the building; and • Finished floor level of the lowest habitable room in the building. Ground floor levels should be a minimum of whichever is higher of: • 300 millimetres (mm) above the general ground level of the site; OR • At least 600 mm above the estimated river or sea flood level

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7. Resilience and mitigation

Based on the available information mitigation measures outlined within this section of the report are likely to help protect the development from flooding.

Emergency evacuation/safe access and egress routes Flood Warnings Direct (FWD)

The EA operates a flood warning service in all areas at risk of flooding; this is available on their website (www.environment-agency.gov.uk). Flood warnings are broadcast on TV and radio weather and travel bulletins and, in designated flood warning areas, direct to the local community by siren, loudhailer or flood wardens, and in high risk areas by phone or fax. The flood warning information on the EA website is updated every 15 minutes. All warnings are also available through the EA’s 24 hour Floodline Service 0845 988 1188. Furthermore, people may sign up to Flood Warnings Direct (FWD) to receive a pre-recorded flood warning message sent to their home, work or mobile phone number. The Site is located within an EA Flood Warning Coverage area so is able to receive warnings via the EA Flood Warnings Direct Service (Figure 6). The EA aims to issue flood warnings 2 hours in advance of a flood event. Flood warnings can provide adequate time to enable protection of property and evacuation from a Site, reducing risk to life and property. Figure 6 EA Flood Warning Coverage for the local area.

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Emergency Evacuation

Where possible, a safe access and egress route with a ‘very low’ hazard rating from areas within the floodplain to an area wholly outside the 1 in 100 year flood event including an allowance for climate change should be demonstrated.

Based on the EA Flood Risk Map the closest dry evacuation area within Flood Zone 1 is along North Street (c.400 m north east – direct measurement). It is advised that evacuation from the premises would be the preferred option in a flood event if safe to do so. It is recommended that residents prepare to evacuate as soon as an EA flood warning is issued in order to completely avoid flood waters.

Principal escape route

Residents should exit the property, turning left (from the northwestern point of the Site) to travel north along Nursery Road for 765 m before turning right onto Peck Road. Following this route will lead residents into Flood Zone 1 and an area within a ‘Very Low Hazard’ rating where provisions can be made for alternative accommodation.

In total, the proposed primary evacuation route is 765 m from the Site and would take approximately 3 minute without traffic to complete by car and 10 minutes by foot. Upon inspection of OS data, the EA flood map and LiDAR data, this is considered to be the most appropriate evacuation route from the Site.

The proposed primary evacuation route utilises a public highway, which should allow for easier navigation.

On-site refuge

As residential areas of the development are situated on the ground floor, on-site refuge is not considered appropriate.

Other relevant information

A flood evacuation plan is recommended and occupants should be signed up to the Environment Agency’s flood warning scheme.

Registration to the Environment Agency’s flood warning scheme can be done by following this link: https://fwd.environment-agency.gov.uk/app/olr/register

It is recommended that main communication lines required for contacting the emergency services, electricity sockets/meters, water supply and first aid stations and supplies are not compromised by flood waters. Where possible these should all be raised above the extreme flood level.

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Fluvial/coastal mitigation measures Modelled Flood Levels

• 1 in 100 year + 35% Climate Change modelled flood level: 25.67 mAOD The Site is located within Flood Zone 2. However a comparison of the Site specific topographic survey (SJ Geomatics ,2017) and both modelled and estimated flood levels, indicate flood flows in all events up to the 1 in 1000 year event would not reach the Site. Flood depths within Nursery Road, outside of the Site boundary, would be 0 and 0.1m. Although the areas of the Site proposed for development would not be impacted.

Raising minimum floor levels

The vulnerability classification of the site and the Flood Zone means proposals for the Site fall under DEFRA and Environment Agency Flood Risk Standing Advice (FRSA) for more vulnerable developments, which states that ground floor levels should be a minimum of whichever is higher of:

• 0.3 m above the general ground level of the site

• 0.6 m above the estimated river or sea flood level (EA/DEFRA, 2012)

As the Site is located within Flood Zone 2 we recommend minimum finished floor levels are located at least 0.6m above the above 1 in 100 year plus 35% allowance for climate change flood level of 25.67 mAOD

Minimum Finished Floor Level Required: 26.27 mAOD1 The current threshold levels for the outbuilding currently on the Site is 25.78mAOD in the south west and 25.83 mAOD in the east of the building, therefore it is recommended that the threshold levels are raised. Where the existing thresholds cannot be raised, the additional mitigation measures detailed below could be adopted. Surface water (pluvial) flooding It would be appropriate to adopt a water exclusion strategy for flood depths up to 0.3 m. A water exclusion strategy, using avoidance and resistance measures, is appropriate where floods are expected to last for short durations. Potential water exclusion strategies include:

• Raising ground floor levels • Construction of local bunds • Landscaping to divert water away from the property • Sustainable Drainage Systems (SuDS) to store/intercept flood water • Boundary walls/fencing • Use of building materials with low permeability up to 0.3 m • Use of flood resilient materials and designs

1 600mm above the 1 in 100 year + 35% Climate Change modelled flood level: 25.67 mAOD

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Avoidance and resistance measures are unlikely to completely prevent floodwater entering a property, particular during longer duration flood events. Therefore, it is recommended that flood resilience measures are also considered.

In addition, the regular maintenance of any drains and culverts surrounding/on the Site should be undertaken to reduce the flood risk.

A SuDS design should be considered to mitigate any flood risk both to and from the Site.

Groundwater mitigation measures It is likely that the mitigation measures put in place for fluvial/coastal and pluvial risk will be sufficient for the groundwater flood risk at the Site. However specific groundwater measures that may also be considered include:

• Waterproof tanking of the ground floor area; • Interceptor drains; • Automatic sump to extract flood water; and • Non-return flap valve on the proposed foul and surface water sewer lines.

Reservoir flooding According to Environment Agency information, the Site is not at risk of reservoir flooding.

Other flood risk mitigation measures As the Site is not identified as at risk from other sources, mitigation measures are not required.

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8. Conclusions and recommendations

A MODERATE fluvial flood risk has been identified.

A LOW TO VERY LOW surface water flood risk has been identified

A MODERATE groundwater flood risk has been identified.

The Site is not located in an area classified as being at risk of flooding from reservoir failure.

More vulnerable developments in a Flood Zone 2 are acceptable according to the NPPF and providing the recommended mitigation measures are put in place (see previous sections) it is likely that flood risk to this Site will be reduced to an acceptable level.

The table below provides a summary of where the responses to key questions are discussed in this report.

Fluvial, Surface Water, Key sources of flood risks identified Groundwater (see Section 3).

Are standard mitigation measures likely to provide Yes, see Section 7. protection from flooding to/from the Site?

Is the development likely to satisfy the requirements N/A, see Section 6. of the Sequential Test?

It is recommended that minimum floor levels for the Site are set no lower than 26.27 mAOD. Where raising the finished floor levels within the majority of the development cannot be achieved, a water exclusion strategy for flood depths up to 0.3m including flood resistance measures such Is any further work recommended? as barriers for flood depths up to 0.3m. esilience measures such as raising electrical sockets, tiling the proposed extension floor and non-return flap valves should be considered for any proposed foul and surface water discharge pipes. A Sustainable Drainage scheme should be considered for the Site

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and specific groundwater measures should be implemented on the Site. We recommend that mitigation measures that have been discussed within this report are considered as part of the proposed development where possible and evidence of this is provided to the Local Authority as part of the planning application.

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9. Further information and what to do next

The following table includes a list of products by GeoSmart:

Recommendations for next steps

Additional The SuDSmart Report range assesses which drainage options assessment: are available for a Site. They build on technical detail starting ✓ from simple infiltration screening, and work up to more complex SuDSmart SuDS Assessments detailing alternative options and designs. Report Please contact [email protected] for further information.

Additional The FloodSmart Report range provides clear and pragmatic advice regarding the nature and potential significance of flood assessment: hazards which may be present at a site. Our consultants assess available data to determine the level of risk based on FloodSmart professional judgement and years of experience. Report Please contact [email protected] for further information.

Provides a robust desk-based assessment of potential contaminated land issues, taking into account the regulatory Additional perspective. assessment: Our EnviroSmart reports are designed to be the most cost ✓ effective solution for planning conditions. Each report is EnviroSmart individually prepared by a highly experienced consultant conversant with Local Authority requirements. Report Ideal for pre-planning or for addressing planning conditions for small developments. Can also be used for land transactions. Please contact [email protected] for further information.

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10. References and glossary

British Geological Survey (BGS) (2017). Geology of Britain Viewer. (http://mapapps.bgs.ac.uk/geologyofbritain/home.html), accessed on 04/07/17.

Defra/Environment Agency (2005). Flood Risk Assessment Guidance for New Development. Phase 2 Framework and Guidance for Assessing and Managing Flood Risk for New Development – Fill Documentation and Tools. R & D Technical Report FD232-/TR2.

Department for Communities and Local Government (2012). National Planning Policy Framework (NPPF).

Environment Agency [EA] (2017a). Product 4 (Detailed Flood Risk) for: Aver House, Nursery Road, Waltham Abbey, EN9 2JE

Environment Agency [EA] (2017b). Pre-application form for Aver House, Nursery Road, Waltham Abbey, EN9 2JE.

Environment Agency [EA] (2017c). What’s in your backyard? Interactive Maps. Accessed on 04/07/2017 from http://maps.environment- agency.gov.uk/wiyby/wiybyController?ep=maptopics&lang=_e

GeoSmart (2017). GeoSmart groundwater flood risk map (version 2.1).

National Planning Practice Guidance (2014). Planning Practice Guidance. Flood Risk and Coastal Change. Accessed from http://planningguidance.planningportal.gov.uk/blog/guidance/flood-risk-and-coastal- change/ on 04/07/17.

Thames Water (2017). Thames Water Property Searches – Sewer Flooding History Enquiry. SFH/SFH Standard/2017_3597020.

URS (2015). Level 1 Strategic Flood Risk Assessment Update. Accessed on: 04/07/2017. Accessed fromhttp://eppingforest.consultationonline.co.uk/wp- content/uploads/sites/5/2016/08/Level-1-Strategic-Flood-Risk-Assessment-SFRA-Update- 2015.pdf

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Glossary

General terms BGS British Geological Survey

EA Environment Agency

GeoSmart groundwater GeoSmart’s national groundwater flood risk model takes advantage of all the flood risk model available data and provides a preliminary indication of groundwater flood risk on a 50m grid covering England and Wales. The model indicates the risk of the water table coming within 1 m of the ground surface for an indicative 1 in 200 year return period scenario.

Dry-Island An area considered at low risk of flooding (eg. In a Flood Zone 1) that is entirely surrounded by areas at higher risk of flooding (eg. Flood Zone 2 and 3)

Flood resilience Flood resilience of wet-proofing accepts that water will enter the building, but through careful design will minimise damage and allow the re-occupancy of the building quickly. Mitigation measures that reduce the damage to a property caused by flooding can include water entry strategies, raising electrical sockets off the floor, hard flooring.

Flood resistance Flood resistance, or dry-proofing, stops water entering a building. Mitigation measures that prevent or reduce the likelihood of water entering a property can include raising flood levels or installation of sandbags.

Flood Zone 1 This zone has less than a 0.1% annual probability of river flooding

Flood Zone 2 This zone has between 0.1 and 1% annual probability of river flooding and between 0.1% and 0.5 % annual probability sea flooding

Flood Zone 3 This zone has more than a 1% annual probability of river flooding and 0.5% annual probability of sea flooding Functional Flood Plain An area of land where water has to flow or be stored in times of flood.

Hydrologic model A computer model that simulates surface run-off or fluvial flow. The typical accuracy of hydrologic models such as this is ±0.25m for estimating flood levels at particular locations. OS Ordnance Survey

Residual Flood Risk The flood risk remaining after taking mitigating actions.

SFRA Strategic Flood Risk Assessment. This is a brief flood risk assessment provided by the local council

SuDS A Sustainable drainage system (SuDS) is designed to replicate, as closely as possible, the natural drainage from the Site (before development) to ensure that the flood risk downstream of the Site does not increase as a result of the land being developed. SuDS also significantly improve the quality of water leaving the Site and can also improve the amenity and biodiversity that a site has to offer. There are a range of SuDS options available to provide effective surface water management that intercept and store excess run-off. Sites over 1 Ha will usually require a sustainable drainage assessment if planning permission is required. The current proposal is that from April 2014 for more than a single dwelling the drainage system will require approval from the SuDs Approval Board (SABs).

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Aquifer Types Principal aquifer These are layers of rock or drift deposits that have high intergranular and/or fracture permeability - meaning they usually provide a high level of water storage. They may support water supply and/or river base flow on a strategic scale. In most cases, principal aquifers are aquifers previously designated as major aquifer.

Secondary A Permeable layers capable of supporting water supplies at a local rather than aquifer strategic scale, and in some cases forming an important source of base flow to rivers. These are generally aquifers formerly classified as minor aquifers.

Secondary B Predominantly lower permeability layers which may store and yield limited aquifer amounts of groundwater due to localised features such as fissures, thin permeable horizons and weathering. These are generally the water-bearing parts of the former non-aquifers.

Secondary Has been assigned in cases where it has not been possible to attribute either undifferentiated category A or B to a rock type. In most cases, this means that the layer in question has previously been designated as both minor and non-aquifer in different locations due to the variable characteristics of the rock type.

Unproductive These are rock layers or drift deposits with low permeability that has negligible Strata significance for water supply or river base flow.

NPPF (2012) terms

Exception test Applied once the sequential test has been passed. For the exception test to be passed it must be demonstrated that the development provides wider sustainability benefits to the community that outweigh flood risk and a site- specific FRA must demonstrate that the development will be safe for its lifetime taking account of the vulnerability of its users, without increasing flood risk elsewhere, and, where possible, will reduce flood risk overall.

Sequential test Aims to steer new development to areas with the lowest probability of flooding.

Essential Essential infrastructure includes essential transport infrastructure, essential infrastructure utility infrastructure and wind turbines.

Water compatible Water compatible land uses include flood control infrastructure, water-based recreation and lifeguard/coastal stations.

Less vulnerable Less vulnerable land uses include police/ambulance/fire stations which are not required to be operational during flooding and buildings used for shops/financial/professional/other services.

More vulnerable More vulnerable land uses include hospitals, residential institutions, buildings used for dwelling houses/student halls/drinking establishments/hotels and sites used for holiday or short-let caravans and camping.

Highly vulnerable Highly vulnerable land uses include police/ambulance/fire stations which are required to be operational during flooding, basement dwellings and caravans/mobile homes/park homes intended for permanent residential use.

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Appendices

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Appendix A

Current development plans

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This is a copy of the title plan on 22 JAN 2014 at 10:47:05. This copy does not take account of any application made after that time even if still pending in the Land Registry when this copy was issued.

This copy is not an Official Copy of the title plan. An official copy of the title plan is admissible in evidence in a court to the same extent as the original. A person is entitled to be indemnified by the registrar if he or she suffers loss by reason of a mistake in an official copy. If you want to obtain an official copy, the Land Registry web site explains how to do this.

The Land Registry endeavours to maintain high quality and scale accuracy of title plan images.The quality and accuracy of any print will depend on your printer, your computer and its print settings.This title plan shows the general position, not the exact line, of the boundaries. It may be subject to distortions in scale. Measurements scaled from this plan may not match measurements between the same points on the ground. See Land Registry Public Guide 19 - Title plans and Co-ordinate Table

Station Type Easting (mE) Northing (mN) Level (mZ)

JD1 PK Nail 538674.133 206394.735 25.782

JD2 PK Nail 538678.125 206406.544 26.265

SURVEY RELATED TO OSGB36(02) ORDNANCE SURVEY GRID CO-ORDINATES TRANSFORMED FROM ETRS89 USING GEIOD MODELS OSGM02/OSTN02 538650.00 538675.00 538700.00

TREE CANOPY

ASSUMED POSITION

TREE CANOPY UNABLE TO SURVEY AREA DUE DENSE VEGETATION ASSUMED POSITION

I/R UNABLE TO SURVEY 28.21 TREE CANOPY AREA DUE DENSE VEGETATION WALL N TP TREE CANOPY

25.82 I/R PRIVATE LAND 28.27

25.74 WALL JD2

25.97 T 26.03 CONCRETE 26.00 OUT BUILDING ASPHALT RIDGE29.08 25.76 I/R 28.32

THL T 25.83 THL 25.78 DP 25.79 25.96

EAVES28.23 T I/R DP 25.78 28.12 206400.00 206400.00 25.80

CONCRETE 26.02

25.97 25.80 T CONCRETE PORTA-LOO 28.06

I/R 28.18

25.81 T I/R 25.91 28.21 I/R NOTES 28.34 PRIVATE LAND 1. GRID AND LEVELS RELATED TO ORDNANCE SURVEY GPS NETWORK

25.92 JD1 C/L 28.07 2. ALL LEVELS ON KERB LINES ARE CHANNEL LEVELS UNLESS NOTED T 26.00 OTHERWISE. 25.92 25.89 3. SERVICE ROUTES HAVE BEEN IDENTIFIED BY LIFTING OF INSPECTION ASPHALT COVERS & VISUAL INSPECTION FROM THE SURFACES. PRIVATE LAND 4. FOR SAFETY REASONS, DRAINAGE PIPE SIZES HAVE BEEN DETERMINED FROM THE SURFACE AND SHOULD BE TREATED AS APPROXIMATE ONLY.

T 5. DRAINAGE PIPE SIZES ARE DIAMETERS AND ARE SHOWN IN MILLIMETERS.

6. TREE SPECIES SHOULD BE CHECKED BY AN ARBORIST IF CRITICAL.

Revisions A

T B C Revision Sheet OUT BUILDING - 1/1 29.15 DrawingSurveyed By:- DrawnNo: By:- SJG2406Checked By:- Sheet Size Date JD JD SJ A1 02/06/2017 Client:-

Scale:- T DPA 1:200

Project:- Aver House, Nursery Road, T Nazeing, Essex, EN9 2JE. SYMBOLS LEGEND AV Air Valve MH Manhole BD Bollard MK Marker Banking BH Borehole NP Name Plate CB Cable Box O/H Overhead

CHY Chimney OSBM Ordnance Bench T Hedge CL Cover Level Mark CONC Concrete P Post Or Pillar CTV Cable TV PM Parking Meter Tree DK Drop Kerb RE Rodding Eye DP Down Pipe RS Road Sign DR Drain SAP Sapling ELC Electricity SC Stop Cock EP Elec.Pole SL Sump Level Bush ER Earth Rod ST Stop Tap FB Flower Bed SV Sluice Valve FH Fire Hydrant TAR Tarmac Gate FP Footpath TC Telecom Cover GY Gully TCB Telephone Call Box O/H Electric GP Gate Post GV Gas Valve TL Traffic Lights IC Inspec. Cover TP Telegraph Pole O/H Telecom IL Invert Level TV Television Box JB Junction Box UTL Unable to lift S1 KO Kerb Outlet VP Vent Pipe LB Letter Box WL Water Level Control Station LP Lamp Post WM Water Meter WO Wash Out 206375.00 206375.00 FENCE TYPES B/W Barbed Wire C/P Chestnut Paling P/S Palisade C/B Close Boarded I/R Iron Railing P/W Post & Wire C/I Corrugated Iron I/W Interwoven C/L Chainlink P/R Post & Rail

WALL BOX AROUND LEVEL INDICATES LEVEL AT TOP OF FEATURE - FOR EXAMPLE - 1.35 SURVEYED BY:-

48c Thoroughfare Halesworth 538650.00 538675.00 538700.00 Suffolk IP19 8AR Tel. 01986 872716 Fax. 01986 875175 email. [email protected] web. www.sjgeomatics.co.uk

Company Registration Number 8081329

Appendix B

GeoSmart Data Maps Bluesky Aerial image (Bluesky, 2017)

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Environment Agency DTM5 (5m) map (EA, 2017)

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Environment Agency Flood Alerts and Warning Area (EA, 2017)

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Environment Agency Flood Map for Planning Purposes (EA, 2017)

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UKFloodMap4TM Fluvial and Tidal 1 in 100 year Flood Depth Map (Ambiental, 2017)

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GeoSmart Groundwater Water Flood Risk Map (v2.1) (EA, 2017)

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EA Historic Flood Events (EA, 2017)

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UKFloodMap4TM 1 in 75 year Pluvial Flood Risk Map (Ambiental, 2017)

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Appendix C

Environment Agency data

Return period Flood Level (mAOD) 1% (1 in 100 year event) 25.58 1.20% (1 in 100 year event plus 20% climate change) 25.66 1.25% (1 in 100 year event plus 25% climate change) 25.649 1.35% (1 in 100 year event plus 35% climate change) 25.665 10%(1 in 1000 year event) 25.69

Thames climate change allowence flood level 25.72 25.7 25.68 25.66 25.64 25.62 25.6 25.58 25.56 25.54 25.52 1% 1.20% 1.60%

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Flood Map for Planning centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

n i a r

D er) (Low g on n vigati i Na e Lee z a Environment Agency r) we N Lo n ( 2 Bishops Square Business Park tio iga av St Albans Road West e N r) e e L Hatfield w o L ( r) Hertfordshire n e • tio w a Lo ig ( AL10 9EX v n a tio N a e ig e av L N e Le 0 130 260 520

er) Low Metres n ( atio vig Na Lee Legend Main Rivers Flood Map for Planning

n i

a r

D Flood Storage Area

n i

a Areas Benefiting from Flood Defences

N Flood Zone 3 Flood Zone 2

n i a r

D N g aze n ing i Bro e ok z a

N Flood Map for Planning (assuming no defences)

Flood Zone 3 shows the area that could be affected by flooding: - from the sea with a 1 in 200 or greater

chance of happening each year k

o - or from a river with a 1 in 100 or greater

r B

chance of happening each year.

c i

L Flood Zone 2 shows the extent of an extreme flood from rivers or the sea with up to a 1 in 1000 chance of occurring each year. Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

in a r D g in e z a N

Environment Agency 2 Bishops Square Business Park ain Dr St Albans Road West ng zei Na Hatfield Hertfordshire • AL10 9EX

0 45 90 180

Metres Legend

n i

a r

D Main Rivers g

n i

N Defended Flood Outlines

1 in 2 (50%) Defended 1 in 5 (20%) Defended 1 in 10 (10%) Defended 1 in 20 (5%) Defended

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless otherwise stated. You should refer to ‘Flood risk assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- climate-change-allowances Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

in a r D g in e z a N

Environment Agency 2 Bishops Square Business Park ain Dr St Albans Road West ng zei Na Hatfield Hertfordshire • AL10 9EX

0 45 90 180

Metres Legend

n i

a r

D Main Rivers g

n i

N Defended Flood Outlines

1 in 50 (2%) Defended 1 in 75 (1.3%) Defended 1 in 100 (1%) Defended

in a r D g in e z a N

Environment Agency 2 Bishops Square Business Park ain Dr St Albans Road West ng zei Na Hatfield Hertfordshire • AL10 9EX

0 45 90 180

Metres Legend

n i

a r

D Main Rivers g

n i

N Defended Flood Outlines

1 in 100+20% (*CC) Defended 1 in 200 (0.5%) Defended 1 in 1000 (0.1%) Defended

in a r D g in e z a N

Environment Agency NM21Usd 2 Bishops Square Business Park ai!(n Dr St Albans Road West ng NM21U zei Na !( Hatfield Hertfordshire • AL10 9EX NM21d !( 0 45 90 180

Metres Legend

n i

a r

D NM19 Main Rivers g

n i !( e

N 1D Node Results

!( Node Results NM18 !(

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). NM17 This was a catchment-scale mapping study, so may need local !( updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless otherwise stated. You should refer to ‘Flood risk assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- climate-change-allowances Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Environment Agency ref: HNL49195

The data in this map has been extracted from the River Lee 2D Modelling study (CH2M Hill, 2014). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless otherwise stated. You should refer to ‘Flood risk assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments-climate-change-allowances

Caution: This model has been designed for catchmentwide flood risk mapping. It should be notedthat it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment wide defences.

All flood levels are given in metres Above Ordnance Datum (mAOD) All flows are given in cubic metres per second (cumecs)

MODELLED FLOOD LEVEL Return Period Node Label Easting Northing Watercourse 2 yr 5 yr 10 yr 20 yr 50 yr 75 yr 100 yr 100 yr + 20% 200 yr 1000 yr NM17 538211 206276 M02 22.95 23.25 23.36 23.57 23.81 23.96 24.24 24.65 24.43 24.98 NM18 538246 206379 M02 22.96 23.27 23.38 23.59 23.83 23.97 24.25 24.66 24.45 25.00 NM19 538264 206441 M02 22.96 23.28 23.39 23.61 23.84 23.99 24.26 24.67 24.45 25.00 NM21d 538260 206542 M02 22.98 23.31 23.42 23.64 23.87 24.02 24.30 24.72 24.49 25.11 NM21U 538249 206595 M02 24.02 24.15 24.18 24.24 24.29 24.35 24.49 24.82 24.64 25.18 NM21Usd 538248 206610 M02 24.02 24.15 24.18 24.24 24.29 24.35 24.49 24.82 24.64 25.18

MODELLED FLOWS Return Period Node Label Easting Northing Watercourse 2 yr 5 yr 10 yr 20 yr 50 yr 75 yr 100 yr 100 yr + 20% 200 yr 1000 yr NM17 538211 206276 M02 40.87 69.27 77.76 91.81 99.62 104.14 112.52 134.31 121.48 161.25 NM18 538246 206379 M02 40.84 69.13 77.75 91.81 99.66 104.13 112.53 134.33 121.43 161.24 NM19 538264 206441 M02 40.79 69.21 77.74 91.82 99.64 104.13 112.57 134.39 121.48 161.24 NM21d 538260 206542 M02 40.72 69.36 77.72 91.82 99.67 104.13 112.59 134.43 121.51 161.26 NM21U 538249 206595 M02 40.72 69.36 77.72 91.82 99.67 104.13 112.59 134.43 121.51 161.26 NM21Usd 538248 206610 M02 40.72 69.37 77.72 91.82 99.69 104.13 112.65 134.42 121.55 161.28 Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 2 (50%) Defended M02

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 otherwise stated. You should refer to ‘Flood risk !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 climate-change-allowances !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 5 (20%) Defended M02

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 otherwise stated. You should refer to ‘Flood risk !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 climate-change-allowances !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 10 (10%) Defended M02

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 otherwise stated. You should refer to ‘Flood risk !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 climate-change-allowances !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 20 (5%) Defended M02

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 otherwise stated. You should refer to ‘Flood risk !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 climate-change-allowances !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 50 (2%) Defended M02

The data in this map has been extracted from the River Lee 2D Flood Mapping Study (CH2M Hill, 2014). This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was not created to produce flood levels for specific development sites within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall Sluices Operational Scenario Modelling (CH2M Hill, 2014), and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). Flood risk data requests including an allowance for climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 otherwise stated. You should refer to ‘Flood risk !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 climate-change-allowances !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

Metres Legend Main Rivers 2D Node Results: Heights

!( 1 in 75 (1.33%) Defended M02

The data in this map has been extracted from the River Lee 25.53 2D Flood Mapping Study (CH2M Hill, 2014). !( This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was 25.53 25.53 not created to produce flood levels for specific development sites !( !( within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall 25.53 25.53 25.53 25.53 Sluices Operational Scenario Modelling (CH2M Hill, 2014), !( !( !( !( and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). 25.53 25.53 25.53 25.53 25.53 25.53 Flood risk data requests including an allowance for !( !( !( !( !( !( climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 25.53 25.53 25.53 25.53 25.53 25.53 25.53 otherwise stated. You should refer to ‘Flood risk !( !( !( !( !( !( !( !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 25.53 25.53 25.53 25.53 25.53 25.53 25.53 25.53 !( !( !( !( !( !( !( !( !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 25.53 25.53 25.53 25.53 25.53 25.53 25.53 !( !( !( !( !( !( !( !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 25.53 25.53 25.53 25.53 25.53 25.53 25.53 climate-change-allowances !( !( !( !( !( !( !( !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

25.58 25.58 Metres !( !(

25.58 25.58 Legend !( !( Main Rivers 25.58 25.58 !( !( 2D Node Results: Heights 25.58 25.58 25.58 25.58 !( !( !( !( !( 1 in 100 (1%) Defended M02 25.58 25.58 25.58 25.58 !( !( !( !(

25.58 25.58 25.58 25.58 25.58 25.58 !( !( !( !( !( !(

The data in this map has been extracted from the River Lee 25.59 25.59 25.58 25.58 25.58 25.58 2D Flood Mapping Study (CH2M Hill, 2014). !( !( !( !( !( !( This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was 25.59 25.59 25.58 25.58 25.58 25.58 not created to produce flood levels for specific development sites !( !( !( !( !( !( within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall 25.59 25.59 25.59 25.59 25.58 Sluices Operational Scenario Modelling (CH2M Hill, 2014), !( !( !( !( !( and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). 25.6 25.6 25.59 25.59 25.59 25.59 Flood risk data requests including an allowance for !( !( !( !( !( !( climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 23.95 25.6 25.6 25.6 25.59 25.59 25.59 25.59 otherwise stated. You should refer to ‘Flood risk !( !( !( !( !( !( !( !( !( 25.59 assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 23.95 23.95 23.95 23.95 25.6 25.6 25.6 25.6 25.59 25.59 25.59 !( !( !( !( !( !( !( !( !( !( !( !( you are proposing and its location. You may need to 25.59 undertake further assessment of future flood risk using different allowances to ensure your assessment of future 23.95 23.95 23.95 23.95 23.95 25.6 25.6 25.6 25.6 25.59 25.59 25.59 !( !( !( !( !( !( !( !( !( !( !( !( !( flood risk is based on best available evidence. 25.59 https://www.gov.uk/guidance/flood-risk-assessments- 23.95 23.95 23.95 23.95 25.6 25.6 25.6 25.6 25.6 25.6 25.59 25.59 climate-change-allowances !( !( !( !( !( !( !( !( !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

25.66 25.66 Metres !( !(

25.66 25.66 Legend !( !( Main Rivers 25.66 25.66 !( !( 2D Node Results: Heights 25.66 25.66 25.66 25.66 !( !( !( !( !( 1 in 100+20% (*CC) Defended M02 25.66 25.66 25.66 25.66 !( !( !( !(

25.66 25.66 25.66 25.66 25.66 25.66 !( !( !( !( !( !(

The data in this map has been extracted from the River Lee 25.66 25.66 25.66 25.66 25.66 25.66 2D Flood Mapping Study (CH2M Hill, 2014). !( !( !( !( !( !( This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was 25.59 25.66 25.66 25.66 25.66 25.66 25.66 not created to produce flood levels for specific development sites !( !( !( !( !( !( !( within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall 25.59 25.59 25.59 25.59 25.59 25.59 25.66 25.66 25.66 25.66 25.66 Sluices Operational Scenario Modelling (CH2M Hill, 2014), !( !( !( !( !( !( !( !( !( !( !( and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). 25.42 25.4 25.48 25.58 25.59 25.59 25.59 25.59 25.59 25.59 25.66 25.66 25.66 25.66 25.66 25.66 Flood risk data requests including an allowance for !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 24.34 24.34 25.5 25.5 25.56 25.58 25.58 25.59 25.59 25.59 25.59 25.59 25.66 25.66 25.66 25.66 25.66 25.66 25.66 25.66 otherwise stated. You should refer to ‘Flood risk !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 24.34 24.34 24.34 24.34 25.41 25.49 25.5 25.53 25.57 25.58 25.58 25.59 25.59 25.59 25.59 25.61 25.66 25.66 25.66 25.66 25.66 25.66 25.66 25.66 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 24.34 24.34 24.34 24.34 24.76 25.15 25.34 25.37 25.43 25.42 25.52 25.53 25.52 25.57 25.58 25.59 25.59 25.65 25.66 25.66 25.66 25.66 25.66 25.66 25.66 25.66 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 24.34 24.34 24.34 24.34 24.92 25.33 25.33 25.33 25.33 25.33 25.33 25.33 25.37 25.37 25.4 25.66 25.66 25.66 25.66 25.66 25.66 25.66 25.66 climate-change-allowances !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

25.65 25.65 Metres !( !(

25.65 25.65 Legend !( !( Main Rivers 25.65 25.65 !( !( 2D Node Results: Heights 25.65 25.65 25.65 25.65 !( !( !( !( !( 1 in 200 (0.5%) Defended M02 25.65 25.65 25.65 25.65 !( !( !( !(

25.65 25.65 25.65 25.65 25.65 25.65 !( !( !( !( !( !(

The data in this map has been extracted from the River Lee 25.65 25.65 25.65 25.65 25.65 25.65 2D Flood Mapping Study (CH2M Hill, 2014). !( !( !( !( !( !( This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was 25.65 25.65 25.65 25.65 25.65 25.65 not created to produce flood levels for specific development sites !( !( !( !( !( !( within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall 25.51 25.51 25.51 25.51 25.65 25.65 25.65 25.65 25.65 Sluices Operational Scenario Modelling (CH2M Hill, 2014), !( !( !( !( !( !( !( !( !( and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). 25.51 25.51 25.51 25.51 25.51 25.51 25.65 25.65 25.65 25.65 25.65 25.65 Flood risk data requests including an allowance for !( !( !( !( !( !( !( !( !( !( !( !( climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 24.18 24.18 25.51 25.51 25.51 25.51 25.51 25.65 25.65 25.65 25.65 25.65 25.65 25.65 25.65 otherwise stated. You should refer to ‘Flood risk !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 24.18 24.18 24.18 24.18 25.51 25.51 25.51 25.51 25.58 25.65 25.65 25.65 25.65 25.65 25.65 25.65 25.65 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 24.18 24.18 24.18 24.18 24.18 25.51 25.51 25.51 25.64 25.65 25.65 25.65 25.65 25.65 25.65 25.65 25.65 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 24.18 24.18 24.18 24.18 25.26 25.65 25.65 25.65 25.65 25.65 25.65 25.65 25.65 climate-change-allowances !( !( !( !( !( !( !( !( !( !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Detailed FRA centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

Environment Agency 2 Bishops Square Business Park St Albans Road West Hatfield Hertfordshire • AL10 9EX

0 15 30 60

25.69 25.69 Metres !( !(

25.66 25.66 25.69 25.69 Legend !( !( !( !( Main Rivers 25.67 25.67 25.69 25.69 25.67 !( !( !( !( !( 2D Node Results: Heights 25.68 25.68 25.69 25.69 25.69 25.69 !( !( !( !( !( !( !( 1 in 1000 (0.1%) Defended M02 25.68 25.69 25.69 25.69 25.69 !( !( !( !( !(

25.69 25.69 25.69 25.69 25.69 25.69 !( !( !( !( !( !(

The data in this map has been extracted from the River Lee 25.69 25.69 25.69 25.69 25.69 25.69 2D Flood Mapping Study (CH2M Hill, 2014). !( !( !( !( !( !( This was a catchment-scale mapping study, so may need local updates for site-specific decisions. It should be noted that it was 25.64 25.69 25.69 25.69 25.69 25.69 25.69 25.69 not created to produce flood levels for specific development sites !( !( !( !( !( !( !( !( within the catchment. Modelled outlines take into account catchment-wide defences. Updates to model M03 were undertaken by the Lower Hall 25.64 25.64 25.64 25.65 25.65 25.65 25.69 25.69 25.69 25.69 25.69 Sluices Operational Scenario Modelling (CH2M Hill, 2014), !( !( !( !( !( !( !( !( !( !( !( and updates to model M04 by the Lower Lee Tributaries Economic Appraisal project (CH2M Hill, 2015). 25.56 25.56 25.56 25.61 25.61 25.63 25.64 25.64 25.64 25.65 25.65 25.66 25.69 25.69 25.69 25.69 25.69 25.69 Flood risk data requests including an allowance for !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( climate change will be based on the 1 in 100 flood plus 20% allowance for climate change, unless 25.18 25.18 25.18 25.18 25.18 25.56 25.56 25.61 25.61 25.63 25.63 25.64 25.64 25.65 25.65 25.65 25.68 25.69 25.69 25.69 25.69 25.69 25.69 25.69 otherwise stated. You should refer to ‘Flood risk !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( assessments: climate change allowances’ to check if this allowance is still appropriate for the type of development 25.18 25.18 25.18 25.18 25.18 25.41 25.44 25.55 25.56 25.59 25.61 25.62 25.63 25.64 25.64 25.65 25.65 25.65 25.69 25.69 25.69 25.69 25.69 25.69 25.69 25.69 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( you are proposing and its location. You may need to undertake further assessment of future flood risk using different allowances to ensure your assessment of future 25.18 25.18 25.18 25.18 25.19 25.41 25.41 25.42 25.47 25.49 25.59 25.57 25.56 25.64 25.62 25.65 25.65 25.67 25.69 25.69 25.69 25.69 25.69 25.69 25.69 25.69 !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( flood risk is based on best available evidence. https://www.gov.uk/guidance/flood-risk-assessments- 25.18 25.18 25.18 25.18 25.23 25.4 25.41 25.42 25.42 25.42 25.43 25.47 25.47 25.43 25.53 25.53 25.68 25.69 25.69 25.69 25.69 25.69 25.69 25.69 climate-change-allowances !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Historic Flood Map centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

n i a r

er) Low Metres n ( atio vig Na Lee Legend Main Rivers Flood Event Outlines

n i

a r

D 2000

n i

e z 1990 a

N 1947

n i a r

D N g aze n ing i Bro e ok z a

The historic flood event outlines are based on a combination of anecdotal evidence, Environment Agency staff observations and survey.

Our historic flood event outlines do not k

o provide a definitive record of flooding.

o r

B It is possible that there will be an absence of

e datain places where we have not been able

c i

L to record the extent of flooding. It is also possible for errors occur in the digitisation of historic records of flooding.

Produced by: Partnerships & Strategic Overview, This map is based upon Ordnance Survey Material with the permission of Ordnance Survey on behalf of the controller of Her Majesty's Stationery Office Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Environment Agency 100024198, 2017 Hertfordshire & North London Structures and Defences centred on Aver House, Nursery Road, Waltham Abbey, EN9 2JE - 15/06/2017 - HNL49195

in a r D g in e z a N

Environment Agency 2 Bishops Square Business Park ain Dr St Albans Road West ng zei Na Hatfield Hertfordshire • AL10 9EX

0 45 90 180

Metres Legend

n i

a r

D Main Rivers g

n i

z a NAFRA_STRUCTURE N ASSET_ID 453163 489004 489005 NAFRA_DEFENCE ASSET_ID 7708 7709 12842 13057 41772

The following information on defences has been extracted from the Asset Information Management System (AIMS)

Defences Condition of Design Standard Downstream Upstream Defences Asset ID Asset Type Asset Protection Asset Comment Asset Description of protection Crest Level Crest Level (1=Good, 5 = (years) Poor)

Ex gravel pit, now used for amenity and Nazeing Mead South Lake 13057 high_ground fluvial flood flows. Natural vegetated earth 5 3 (A.K.A) Rusheymead Lake banks.

7708 high_ground fluvial SEE LAKE DEFENCE LINE DETAILS. Natural Bank 100 24.73 24.73 3

7709 high_ground fluvial SEE LAKE DEFENCE LINE DETAILS. Natural Bank 5 24.88 24.88 3

Vegetated earth embankment with prolific Flood Relief Channel 1a 12842 high_ground fluvial self-set vegetation. Steel sheet piling to 50 23.22 24.73 3 RB mid-section

Vegetated earth embankment with prolific 41772 high_ground fluvial self-set vegetation. Steel sheet piling to Flood Relief Channel 1a LB 50 23.26 24.88 3 mid-section Structures Condition of Structures Asset ID Asset Type Asset Protection Asset Comment Asset Description (1=Good, 5 = Poor)

One of two manually operated penstock sluices, located either side of the central outlet channel. These enable upstream 1 of 2 penstock gates in the 453163 control_gate fluvial levels to be lowered for maintenance 3 Nazeing Labyrinth Weir purposes and provide a sweetening flow to the LFRC during periods of dry weather. O&M Manual 53/21.

One of two manually operated penstock sluices, located either side of the central outlet channel. These enable upstream 1 of 2 penstock gates in the 489005 control_gate fluvial levels to be lowered for maintenance Nazeing Labyrinth Weir purposes and provide a sweetening flow to the LFRC during periods of dry weather. O&M Manual 53/21.

The marker boom comprises of floating polystyrene/concrete booms attached to timer piles placed at intervals across the Nazeing Labyrinth Weir 489004 screen fluvial channel. Its purpose is to identify the marker boom safety hazzard created by the weir. O&M Manual 53/21.

Appendix D

Thames sewer flooding report

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Envirep Ltd

Search address supplied Aver House Nursery Road Nazeing Waltham Abbey EN9 2JE

Your reference 65590 PO: 2182

Our reference SFH/SFH Standard/2017_3597020

Received date 23 June 2017

Search date 23 June 2017

Thames Water Utilities Ltd Property Searches, PO Box 3189, Slough SL1 4WW DX 151280 Slough 13

[email protected] www.thameswater-propertysearches.co.uk

0845 070 9148

Page 1 of 3

Search address supplied: Aver House,Nursery Road,Nazeing,Waltham Abbey,EN9 2JE

This search is recommended to check for any sewer flooding in a specific address or area

TWUL, trading as Property Searches, are responsible in respect of the following:-

(i) any negligent or incorrect entry in the records searched;

(ii) any negligent or incorrect interpretation of the records searched;

(iii) and any negligent or incorrect recording of that interpretation in the search report

(iv) compensation payments

Thames Water Utilities Ltd Property Searches, PO Box 3189, Slough SL1 4WW DX 151280 Slough 13

[email protected] www.thameswater-propertysearches.co.uk

0845 070 9148 Page 2 of 3

History of Sewer Flooding

Is the requested address or area at risk of flooding due to overloaded public sewers?

The flooding records held by Thames Water indicate that there have been no incidents of flooding in the requested area as a result of surcharging public sewers.

For your guidance:

• A sewer is “overloaded” when the flow from a storm is unable to pass through it due to a permanent problem (e.g. flat gradient, small diameter). Flooding as a result of temporary problems such as blockages, siltation, collapses and equipment or operational failures are excluded. • “Internal flooding” from public sewers is defined as flooding, which enters a building or passes below a suspended floor. For reporting purposes, buildings are restricted to those normally occupied and used for residential, public, commercial, business or industrial purposes. • “At Risk” properties are those that the water company is required to include in the Regulatory Register that is presented annually to the Director General of Water Services. These are defined as properties that have suffered, or are likely to suffer, internal flooding from public foul, combined or surface water sewers due to overloading of the sewerage system more frequently than the relevant reference period (either once or twice in ten years) as determined by the Company’s reporting procedure. • Flooding as a result of storm events proven to be exceptional and beyond the reference period of one in ten years are not included on the At Risk Register. • Properties may be at risk of flooding but not included on the Register where flooding incidents have not been reported to the Company. • Public Sewers are defined as those for which the Company holds statutory responsibility under the Water Industry Act 1991. • It should be noted that flooding can occur from private sewers and drains which are not the responsibility of the Company. This report excludes flooding from private sewers and drains and the Company makes no comment upon this matter. • For further information please contact Thames Water on Tel: 0800 316 9800 or website www.thameswater.co.uk

Thames Water Utilities Ltd Property Searches, PO Box 3189, Slough SL1 4WW DX 151280 Slough 13

[email protected] www.thameswater-propertysearches.co.uk

0845 070 9148 Page 3 of 3

Appendix E

Environment Agency LiDAR Elevation Data

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Disclaimer This report has been prepared by GeoSmart in its professional capacity as soil and groundwater specialists, with reasonable skill, care and diligence within the agreed scope and terms of contract and taking account of the manpower and resources devoted to it by agreement with its client, and is provided by GeoSmart solely for the internal use of its client.

The advice and opinions in this report should be read and relied on only in the context of the report as a whole, taking account of the terms of reference agreed with the client. The findings are based on the information made available to GeoSmart at the date of the report (and will have been assumed to be correct) and on current UK standards, codes, technology and practices as at that time. They do not purport to include any manner of legal advice or opinion. New information or changes in conditions and regulatory requirements may occur in future, which will change the conclusions presented here.

This report is confidential to the client. The client may submit the report to regulatory bodies, where appropriate. Should the client wish to release this report to any other third party for that party’s reliance, GeoSmart may, by prior written agreement, agree to such release, provided that it is acknowledged that GeoSmart accepts no responsibility of any nature to any third party to whom this report or any part thereof is made known. GeoSmart accepts no responsibility for any loss or damage incurred as a result, and the third party does not acquire any rights whatsoever, contractual or otherwise, against GeoSmart except as expressly agreed with GeoSmart in writing.

For full T&Cs see http://geosmartinfo.co.uk/terms-conditions

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Important consumer protection information

This search has been produced by GeoSmart Information Limited, New Zealand House, 160-162 Abbey Foregate, Shrewsbury, SY2 6FD. Tel: 01743 276 150 Email: [email protected]

GeoSmart Information Limited is registered with the Property Codes Compliance Board (PCCB) as a subscriber to the Search Code. The PCCB independently monitors how registered search firms maintain compliance with the Code.

The Search Code: • provides protection for homebuyers, sellers, estate agents, conveyancers and mortgage lenders who rely on the information included in property search reports undertaken by subscribers on residential and commercial property within the United Kingdom • sets out minimum standards which firms compiling and selling search reports have to meet • promotes the best practice and quality standards within the industry for the benefit of consumers and property professionals • enables consumers and property professionals to have confidence in firms which subscribe to the code, their products and services. • By giving you this information, the search firm is confirming that they keep to the principles of the Code. This provides important protection for you.

The Code’s core principles Firms which subscribe to the Search Code will: • display the Search Code logo prominently on their search reports • act with integrity and carry out work with due skill, care and diligence • at all times maintain adequate and appropriate insurance to protect consumers • conduct business in an honest, fair and professional manner • handle complaints speedily and fairly • ensure that products and services comply with industry registration rules and standards and relevant laws • monitor their compliance with the Code

Complaints If you have a query or complaint about your search, you should raise it directly with the search firm, and if appropriate ask for any complaint to be considered under their formal internal complaints procedure. If you remain dissatisfied with the firm’s final response, after your complaint has been formally considered, or if the firm has exceeded the response timescales, you may refer your complaint for consideration under The Property Ombudsman scheme (TPOs). The Ombudsman can award compensation of up to £5,000 to you if he finds that you have suffered actual loss as a result of your search provider failing to keep to the Code.

Please note that all queries or complaints regarding your search should be directed to your search provider in the first instance, not to TPOs or to the PCCB.

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TPOs contact details: The Property Ombudsman scheme Milford House 43-55 Milford Street Salisbury Wiltshire SP1 2BP Tel: 01722 333306 Fax: 01722 332296 Email: [email protected]

You can get more information about the PCCB from www.propertycodes.org.uk.

Please ask your search provider if you would like a copy of the search code

Complaints procedure

GeoSmart Information Limited is registered with the Property Codes Compliance Board as a subscriber to the Search Code. A key commitment under the Code is that firms will handle any complaints both speedily and fairly.

If you want to make a complaint, we will:

• Acknowledge it within 5 working days of receipt. • Normally deal with it fully and provide a final response, in writing, within 20 working days of receipt. • Keep you informed by letter, telephone or e-mail, as you prefer, if we need more time. • Provide a final response, in writing, at the latest within 40 working days of receipt. • Liaise, at your request, with anyone acting formally on your behalf.

If you are not satisfied with our final response, or if we exceed the response timescales, you may refer the complaint to The Property Ombudsman scheme (TPOs): Tel: 01722 333306, E-mail: [email protected].

We will co-operate fully with the Ombudsman during an investigation and comply with his final decision.

Complaints should be sent to:

Jemma Prydderch Operations Manager

GeoSmart Information Limited New Zealand House 160 Abbey Foregate Shrewsbury SY2 6FD

Tel: 01743 276150 [email protected]

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