STORM WATER FLOOD MODELING IN URBAN AREAS

Storm water flood simulations were attempted through the existing drainage networks of Patna and Chennai urban areas using Storm Water Management Model (SWMM).The input for the model was extracted from different sources and maps in GIS environment.The existing drainage networks catchments were delineated using the Digital Elevation Model (DEM) and flow direction in drainage network.The simulation results are calibrated with observed hydrograph peaks and shape of the hydrographs.The model was run considering the original designed dimensions of the drainage network without any blockage still it is not adequate to dispose of the runoff for two years return period rainfall in both urban areas.