The estimated peak runoff rate shall be compared with carrying capacity of storm water drains to
judge whether estimated runoff will flood the area or not. The extent of flooding can be
estimated using two-dimensional hydrodynamic modeling. For inundation simulation information on drainage characteristics like dimensions of the inlets, levels of the inlets and outlets, information on closed drains, open drains, type of drains etc., is required. Models like MIKEMOUSE, SOBEK, UFDSM, etc., are being used for urban flood modeling. Figures 12.27& 28 shows the geospatial approach for generating flood inundation maps and integration of different models required for modeling of urban floods.
Figure 12.29 shows the early warning system installed for mitigating urban flooding in Mumbai, under Mumbai’s urban flood disaster management and mitigationprogramme.