Evaluation of Geo-morphological characteristics of Devanayakanahalli micro-watershed in Tumkur district of Karnataka

Abstract

17" E longitude in Tumkur district of Karnataka. The drainage networks of micro-watershed were delineated from the Survey of India topographical map of 1:50,000 scale. ArcGIS software was used for evaluation of linear, areal and relief aspects of the micro-watershed. The present study reveals that, drainage pattern of the study area is dendritic with trunk order 3. The watershed area, perimeter, maximum length and width of the watershed were 453 ha, 10.10 km, 3.68 km and 1.23 km respectively. The mean value of bifurcation ratio is 2.20, the micro-watershed has been suffered less structural disturbance and drainage pattern has not been distorted. The value of drainage density is 2.30 km km -2 which indicated that, the region is having permeable subsoil material and good vegetative cover. The value of form factor indicates micro-watershed is approaching towards elongated shape of watershed. The present study reveales that, GIS based approach in evaluation of geo-morphological characteristics is more appropriate than conventional techniques. Over all study suggests that the micro-watershed should be treated with soil and water conservation measures.