Flood Frequency Analysis and Assessment of Submergence Level for the Mathikere Catchment - A Flood Resilient Region in Bengaluru

Flooding is the overflow of water onto typically dry ground. Floods can occur as a result of severe rainfall, the arrival of ocean waves, the rapid melting of snow, or the failure of dams or levees. A few inches of water may be sufficient to cause severe flooding, or it may reach the roof of a home. The study area Mathikere catchment one of the flood prone areas, which is located south-west of Bengaluru, India (13.0334° N, 77.5640° E) and encompasses around 30 $\mathrm{Km}^{2}$ at an altitude of 925 m above mean sea level. Hydrological investigation carried out for the catchment, watershed delineated by SRTM 1 Arc-Second Global (30 meters) and LULC digitisation done by GIS platforms using the covered area of land use pattern runoff estimated by SCS curve number method, flood frequency analysis made through Gumbel’s distribution and maximum probable flood discharge obtained, and IDF curve plotted for 6 hour rainfall intensity and for different return periods, finally submergence level for the catchment has been determined for various return periods by considering abnormal precipitation. This is crucial for assessing urban flood risk and determining disaster response decisions.