Client: Bristol Avon Rivers Trust
Categories: Geomorphology, Natural Flood Management, River Restoration
Location: Corsham, UK
The Leafield Stream is located in Corsham, Wiltshire; which is a tributary of the Bydemill Brook. The river is partially culverted and therefore natural flood mitigation measures including day-lighting of the culvert were provided by the Bristol Avon Rivers Trust.
The project undertook a distributed hydrological model including design rainfall and soil calibration. Soils were calibrated to SPRHOST generated by FEH CD Rom catchment descriptors for the January 2018 event for the gauge at Thingley.
The key project requirements were as follows:
A suite of potential NFM measures were supplied and include:
Model results upstream of the railway are shown in figure 1 below.
Key challenges encountered during the modelling process include the options provided by the client providing minimal benefit to a reduction in peak flows to the main railway line. This provided the opportunity to develop a range of alternative natural flood management options that were more effective.
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