Computation of watershed parameters using Geoinformatics

The primary objective of this paper is to evaluate watershed parameters using remote sensing and geographic information systems for Kadam watershed which is a part of Middle Godavari (G-5) sub basin of Godavari river basin, India. Preparation of maps such as Contour map, Digital Elevation Model (DEM), Flow direction map, Study area boundary map, Slope map, Aspect map, View shed map, Thiessen polygon network map Soil map and Mandal administrative boundary map have been prepared in GIS environment in order to compute watershed parameters which are useful for various applications of watershed hydrology. The maximum and minimum elevations in the study area from the contour map were found to be 350 m and 160 m respectively. Slope map indicated mild to steep slopes varying from 0 to 28 percent for the study area. The areas of Thiessen polygons namely Bazarhatnoor, Boath, Ichoda, Indervelly, Kadam, Khanapur, Neredigonda and Utnoor have been found to be 257.00, 341.61, 279.26, 299.51, 211.73, 421.30,303.00 and 504.13 sq km respectively. The areas of the soil units viz., 19, 59, 60, 61, 62, 63, 66 and 68 were found to be 15.38, 276.89, 17.27, 494.65,388.87, 1278.32,25.57 and 98.17 sq km respectively.