Flood Forecasting
Ravensbourne Flood Forecasting Scheme
Keywords:Software (NFFS, GeoGUI), Forecasting Model Development, Radar Rainfall, Rainfall Runoff Modelling, Hydrodynamic Modelling, Urban Flood Modelling, NFFS Configuration.
Ravensbourne Catchment Map.
Client, Architect & Other Organisations
Environment Agency Thames
Description
Edenvale Young has completed the development of a real-time flood forecasting system for the River Ravensbourne and tributaries, which drain highly urbanised areas from the south of London (Bromley) towards Lewisham before joining the Thames at Deptford. Existing ISIS models were extensively improved and calibrated, including numerous extended rating developments. Due to the relatively small subcatchments and very rapid hydrological response, radar based (actual) rainfall were used for calibration. Edenvale Young assisted the Agency in preparing, calibrating and checking Rainfall Runoff models using the Thames Conceptual Model (TCM).
Due and variability in coverage, accuracy of telemetry data and radar accuracy, the TCM rainfall-runoff models and ISIS hydraulic model were collectively (iteratively) calibrated on 6 (six) historic events for 27 river gauges throughout the catchment.
Configuration of the catchment model into the National Flood Forecasting System is also a key task associated with this project. This project was showcased at the ISIS User Group Conference 2008.