Author's: S. Kalpana, R. Uma
Abstract: Urbanization accompanies the introduction of vast impervious areas and efficient hydraulic conveyance systems resulting changes to an urban setting to dramatically alter the surface hydrology. Remote sensing techniques have been used for monitor the land use changes of Bangalore city over the past five decades (1965-2014) and their impact on natural drainage system. Satellite derived Digital Elevation Model (DEM) and topographic sheets are used to delineate natural drainage pattern of the study area. In this study, corona and LISS-IV data is used along with other ancillary data like rainfall and flow data. Using visual interpretation and field knowledge of the area the surface water bodies/Tanks/Lakes and drainage network was delineated using GIS tool. The results revealed that water bodies were reduced in number and surface area, shape, and some portions of crop lands were converted into built-up areas. SRTM DEM is used for evaluation of morphological parameters like density, slope, stream length etc. Based on pour point and drainage pattern, the entire study area was demarcated as three watersheds. The surface runoff has been generated using Strom Water Management Model (SWMM), which operates on a basis of sub catchment areas precipitation. The runoff volumes obtained from SWMM tool and manual method are compared.
Keywords: Storm Water Management Model, Geographical Information System, Digital Elevation Model, LISS -IV
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