Case study:Trawden Natural Flood Management Scoping Study

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Location: 53° 50' 54.30" N, 2° 8' 12.58" W

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Project overview

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Status	Planned
Project web site	http://www.therrc.co.uk/sites/default/files/projects/45_trawden.pdf
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Land use management - forestry, Social benefits, Water quality
Country	England
Main contact forename	Alison
Main contact surname	Whalley
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Moors for the Future, Ribble Rivers Trust, Edenvale Young Associates, AECOM
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The project will scope out and model NFM interventions that could establish a reduction in flood risk to Trawden, a village at risk of flooding, near Colne in the Ribble catchment in Lancashire (Map 1). The aim is to inform the Trawden Capital Project and identify catchment scale interventions which could add climate change resilience to this scheme. This will be achieved through: • Hydraulic modelling: updating the current flood model to establish potential for Natural Flood Management (NFM). This will done by: carrying out a review of the hydraulic and hydrological modifications that could be made within the modelling to represent the effects of NFM; establishing the reduction in peak flows that may be afforded by NFM, or failing that the climate change resilience that may be offered. • NFM aspirational scoping: carrying out a geomorphology baseline assessment and a landscape scale assessment of the evidence-based NFM solutions that are possible within the catchment surrounding Trawden, including the modelling of each intervention. • NFM prioritisation: identifying opportunities and methods for priority areas for delivery including social, economic and environmental multiple benefits, match funding and current constraints. The results of the scoping study are due for publication in June 2017. The key findings will be whether it is possible to reduce flood risk to Trawden through NFM alone, in combination with a proposed traditional capital scheme, or to add climate change resilience to a traditional capital scheme. To date a landscape scale and geomorphological assessment of the Trawden catchment has identified over 150 potential NFM interventions.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Trawden Brook WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2015 Works started Works completed Project completed Total cost category Total cost (k€) £95k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources RFCC Local levy, Partnership contributions, Moors for the Future 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information