Case study:Holnicote multi-objective flood risk management demonstration project

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Project overview

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Status In progress
Project web site
Themes Economic aspects, Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Land use management - forestry, Monitoring, Social benefits, Water quality
Country England
Main contact forename Nigel
Main contact surname Hester
Main contact user ID
Contact organisation National Trust
Contact organisation web site http://www.nationaltrust.org.uk/
Partner organisations Penny Anderson Associates Ltd, University of Exeter, Environment Agency, Defra, JBA Consulting, JBA Trust
Parent multi-site project
This is a parent project
encompassing the following
projects
No
© Gene Hammond, Penny Anderson Associates Ltd

Project summary

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Driven by Defra, supported by the Environment Agency and managed by the National Trust, this project hopes to demonstrate that by looking at whole catchments and strategically targeting shifts in rural land management practices, sustainable support to flood management may be achieved. In addition, it is recognised that through rural land management change and intervention comes the opportunity to enhance the provision of a range of other ecosystem services within catchments. These include landscape quality, biodiversity, carbon stewardship, water quality, amenity and recreation.

The principal objectives of the Holnicote project, which is currently scheduled to run until 2015, are:
- To establish a robust hydrological monitoring programme across the study area
- To identify potential catchment (hillslope and floodplain) interventions that may contribute to managing flood risk
- To demonstrate the practical implementation of catchment interventions (e.g. changes to land use, land management practices, and hydrological connectivity)
- To assemble evidence, both from recorded datasets and hydrological/hydraulic modelling, about the impact of the catchment interventions on runoff and flood dynamics
- To assess what the evidence reveals about the potential or actual benefits, in terms of flood risk management and the delivery of a range of other ecosystem services

The ecosystem services assessment being undertaken for the project aims to provide an evaluation of the various goods and services provided by the existing ecosystems across the Holnicote Estate, and those anticipated following the range of expected habitat modifications scheduled as part of the catchment interventions. In addition, based on the most robust information available, the assessment will provide an evaluation of the value of these anticipated goods and services relative to the capital investment.

Monitoring surveys and results

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Lessons learnt

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The National Trust is co-funding a PhD student at Exeter University to establish whether the catchment management interventions being implemented can help to improve water quality. The research will complement the catchment-wide hydrological monitoring taking place with some additional chemical, biological and physical water quality monitoring to examine the effectiveness of the intervention measures to also meet water quality objectives.


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Catchment and subcatchment



Site

Name
WFD water body codes
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WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
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Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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Average channel gradient
Average unit stream power (W/m2)


Project background

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Works completed
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Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
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Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://ccmhub.net/wp-content/uploads/2013/01/Holnicote-Position-Paper-v9.pdf An analysis of the impacts of rural land management change - A position paper
http://www.youtube.com/watch?v=3MbkfVQs8Z8 Video: Going with the flow - how the National Trust manages water and flooding on the Holnicote estate
http://ccmhub.net/case-studies/holnicote-case-studies/holnicote/ Catchment change management hub - Holnicote case study
http://ccmhub.net/wp-content/uploads/2013/01/Holnicote-final.pdf Holnicote case study summary

Supplementary Information

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