Real-time Flood Forecasting using NEXRAD Radar Data, on-line Rain Gage Network Calibration, and PCSWMM for the Greater Toronto Region

Rob James and Michael Heralall


This presentation describes a US EPA SWMM5 based flood forecasting system which acquires and processes NEXRAD data to generate subcatchment-specific rainfall time series for current and forecasted conditions. The system provides rain totals to a SWMM5 hydrologic/hydraulic model which generates runoff rates and routes stormwater through the natural watershed drainage network to estimate the limits of flooding. The system also queries the database of flood vulnerable structures and presents a list of structures that would be flood-threatened under the current or forecasted conditions.

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