Morphometric analysis of Yarehalli micro-watershed, of Davanagere district, Karnataka using remote sensing and GIS techniques

Abstract

Yarehalli micro-watershed lies between 750 51' 37.58'' to 750 53' 29.93'' East longitudes and 130 58' 59.95'' to 140 1' 3.72'' in Davanagere 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 as pects of the micro- watershed. The present study reveals that, drainage pattern of the study area is dendritic with trunk order 4th. The watershed area, perimeter, maximum length and width of the watershed was 977 ha, 10.00 km, 4.40 km and 2.20 km respectively. The mean value of bifurcation ratio is 3.23, the micro-watershed have been suffered less structural disturbance and drainage pattern has not been distorted. The value of drainage density is 2.31 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.