Urban Flooding and Drainage Mapping

Urban flooding is a hydrological hazard caused by intense rainfall overwhelming city drainage systems, leading to waterlogging, infrastructure damage, and socio-economic disruption. Unlike riverine floods, urban floods result from improper drainage, land-use changes, and reduced infiltration capacity in built-up environments. Drainage mapping provides the spatial foundation for understanding and managing storm water flow, helping urban planners develop resilient and climate-adaptive cities.

Geographical and Hydrological Basis

• Urban flooding is influenced by the natural topography, geomorphology, and hydrological network of urban regions.
• Cities often expand over floodplains, wetlands, and low-lying basins, which historically functioned as natural drainage buffers.
• Impervious surfaces - roads, pavements, and ....