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From Source to Sea NATURAL FLOOD MANAGEMENT | the HOLNICOTE EXPERIENCE

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From Source to Sea NATURAL FLOOD MANAGEMENT | the HOLNICOTE EXPERIENCE From source to sea NATURAL FLOOD MANAGEMENT | THE HOLNICOTE EXPERIENCE Defra Multi-Objective Flood Management Demonstration Project March 2015 CONTENTS ACKNOWLEDGEMENTS I. Background ............................... 1 Project code RMP 5508 – Multi-Objective Flood Management Demonstration Project – The National Trust Holnicote. The project II. Catchment characterisation delivery team consisted of: National Trust (NT), Environment Agency and interventions .......................... 2 (EA), Penny Anderson Associates (PAA) and JBA Consulting (JBA). The III. Assessment of effects .............. 5 funding for the project was primarily obtained from Defra (£473,000 for phase 1 (2009-2011) and £248,760 for phase 2 (2011-2015)); together IV. Multiple benefits ................... 14 with generous contributions from the Environment Agency and National Trust. The project delivery team would like to acknowledge V. Outcomes and lessons learnt ....17 the support and contributions from all the project funders, project VI. Future work ........................... 21 associates (Exeter University and Cranfield University), key stakeholders (including Wessex Water, Natural England, Exmoor National Park VII. Project Database .................. 24 Authority), NT staff, tenants and the local community. All project reports referred to in the text can be accessed via the Project Database (see Section VII). OUTCOMES AND LEGACIES 4 The targeted implementation of a range of natural 4 Altered hydrological and biogeochemical processes flood management (NFM) measures across the within the agricultural catchment, including Holnicote catchments has been shown to reduce accelerated soil erosion and soil organic matter downstream flood risk and generate a wide range turnover, contributed to an enhanced fluvial of other benefits. suspended sediment and carbon export. 4 A sophisticated rainfall and flow monitoring 4 Greatest water quality impairment was observed network was deployed across the two study in the most intensively farmed central part of the catchments. This monitoring network is currently Aller catchment associated with arable land use, being upgraded and expanded to serve the project so wherever possible arable reversion to grassland going forward and to provide additional, high especially on steeper slopes should be encouraged, resolution data for suspended sediment and flow together with riparian woodland. measurement. 4 An ecosystem services approach has been at the 4 The project has generated a substantial ‘resource’ heart of the Holnicote Project which has delivered of information and data which can be used as a multiple ecosystem benefits for biodiversity, description of baseline conditions. Crucially, the soil management and water quality. A Payment database also represents an invaluable resource for for Ecosystem Services pilot has explored novel other organisations and groups involved in NFM markets for the supply of ecosystem services at a scheme delivery elsewhere. catchment scale. 4 The flow variability and hydrograph analysis 4 Careful management of soils and the continuance of methods adapted and refined for use in this agri-environment support mechanisms hold the key project provide a standardised, transferable toolkit to creating sustainable and resilient rural landscapes. for analysing catchment scale impacts of NFM 4 Engagement of the local community and with other interventions on flow response and flood risk. stakeholders has been a critical project activity from Importantly, the method employs statistical analysis the outset of the scheme. Such processes take time of real data, rather than modelled outcomes. and require a variety of tools and approaches. 4 In terms of catchment scale interventions, the 4 Regular and sensitive engagement has created withdrawal of coarse woody debris removal and an environment within the local community that management in woodlands is a highly cost effective makes all those involved with the catchments more and simple way of achieving NFM and mitigating amenable to suggestions for land management flood risk in the medium and long term, as well as changes that have multi-beneficial outcomes. providing considerable biodiversity benefits. 4 A local project manager involved in all elements of 4 During the extremely wet winter 2013/14 in NFM identification, approval and implementation, Somerset, there was no flooding in the vulnerable together with the stakeholder engagement activities, villages that have experienced regular flooding in greatly contributed to the success of the project. the past, containing 98 properties (55 NT and 43 private) at risk with an insurance value of £30M. 4 The processes adopted and the outcomes from Holnicote are influencing NFM initiatives elsewhere 4 A set of newly constructed offline bunded flood in Somerset and the UK. Individuals, community storage areas helped to deliver a 10% reduction in groups, statutory and non-statutory organisations flood peak during a severe storm in late December are using the Holnicote scheme to give support to 2013 on an already saturated catchment. the momentum for change in the use of NFM. NATURAL FLOOD MANAGEMENT – THE HOLNICOTE EXPERIENCE I. Background Determining and predicting the influence and aim to reduce flooding by working with natural features contribution that rural land management practices and characteristics to store or slow down flood waters. have on catchment scale flood risk management is a topic of national importance. Extreme weather events The project has been completed through the delivery that have occurred over the last 15 years in the UK of the following elements: have highlighted the significant economic and social 1. Catchment characterisation and implementation of costs associated with major flooding incidents. These an extensive hydrometric monitoring network recent flood events have prompted a greater interest in the role of surface runoff generation from the rural 2. Exploration of potential NFM opportunities, environment and the inter-relationships between river including modelling and multiple benefits channels and floodplains in catchments. The notion that 3. Engagement with catchment stakeholders on NFM by changing the way our rural catchments are managed and wider benefits could positively contribute to reducing flood risk, through the processes of flow attenuation and flood 4. Selection of NFM measures for implementation storage is very attractive. 5. Acquisition of the necessary consents/approvals for implementing NFM measures In 2009, in response to one of the recommendations of the Pitt Review of the Summer 2007 Floods, Defra 6. Implementation of NFM measures commissioned three new Multi-Objective Flood 7. Quantification of NFM benefits Management Demonstration Projects, including the Holnicote Project on the National Trust Holnicote Estate 8. Identification of future NFM initiatives in West Somerset. The projects were all tasked with generating hard evidence to demonstrate how working The range of NFM measures that have been with natural processes, implementing a range of natural successfully implemented at Holnicote since 2011 flood management (NFM) measures, and utilising a include: moorland drainage impedance, woody debris partnership approach, can contribute to reducing local dams and accumulation, woodland creation, leaky weirs flood risk while producing a wide range of other benefits and offline flood storage areas. Advice has also been for the environment and communities. Working with provided to the land managers on soil management natural processes represents a range of techniques that practices in arable and grassland systems. 1 FROM SOURCE TO SEA II. Catchment characterisation and interventions SETTING The Holnicote Estate covers the majority of two The Aller catchment has an area of about 18km2 and study catchments, Horner Water and the Aller. The the river is about 7km long. The topography of the catchments are located on the north-east edge of catchment is generally lower than that of the Horner Exmoor National Park and flow down to the sea catchment, ranging from about 400mAOD in the in Porlock Bay. The Horner Water catchment has an moorland headwaters to around 40-50mAOD in the area of about 22km2. The Horner Water, is about 15km middle reach of the Aller encompassing a range of long and drains the hills of Exmoor to the confluence woodland, grassland and arable land uses, together with the River Aller, from where the combined river with the villages of Allerford and West Lynch. The flows into Porlock Bay by seeping through a large middle and lower Aller catchment contains a wider shingle ridge. The topography of the catchment is floodplain than the Horner does and in parts this characterised by extensive high upland moors at the floodplain has been actively managed as flood headwaters (Exmoor) at about 500mAOD; with rapid meadows in the past. The catchment area downstream response steep wooded gullies and combes further of the confluence of the Aller and the Horner drops downstream at about 300mAOD with very confined down from about 20mAOD in the river valley to sea floodplains, sloping down through woodland, grassland level, containing mostly grassland and arable land and arable land uses towards the low lying areas uses with woodland on the eastern valley side and the (around 20mAOD) at the confluence with the River village of Bossington. Aller. The uppermost 20% of the Horner catchment flows through a small water supply reservoir (currently The flood risk receptors are the
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