Thames21: Community (Natural Flood) Modelling in the London Lea Catchment

Currently the Pymmes, Salmons and Ching Brook’s are so polluted that they support extremely limited riverine ecology. Additionally each river is extremely flashy, this washes out much of the ecological value when it eventually does establish. The development and delivery of diffused Nature Based Solutions throughout these catchments would purify the water and regulate the flow regime therefore enable the development of proper riverine ecology within these catchments.
The aim is for evidence gained from this modelling project to lead to catchment scale restoration of 3 of the most challenging rivers in the UK from a water quality and flood risk perspective. It could also change how we look to manage highly challenging urban rivers at a national scale.
The Community Modelling groups brought together in 2017 through the TRF funded T21 Community Water Quality Modelling project, will be investigating the potential of the interventions they’ve identified to reduce the risk of flooding to people and property. The water quality improvement projects will be assessed against an established baseline in order to gauge their flood risk reduction potential at a catchment scale.

This project will provide the final piece of data needed to undertake a natural capital assessment when combined with the Community Water Quality Modelling outcomes. Through the combination of these results T21 hopes to have enough information to develop the business case for significant investment to develop catchment scale water quality improvement and flood risk reduction to people and property.

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