Browsing by Author "BASAVAREDDY"
Now showing 1 - 1 of 1
Results Per Page
Sort Options
ThesisItem Open Access ESTIMATION OF SURFACE RUNOFF BY NRCS CURVE NUMBER METHOD USING GIS AND REMOTE SENSING IN YAREHALLI MICROWATERSHED OF DAVANAGERE DISTRICT.(University of Agricultural Sciences, Bangalore, 2021-12-03) BASAVAREDDY; B. C. RavikumarThe relationship between rainfall and runoff for a watershed is important in various activities of a water resources development and management. The transformation of rainfall to runoff is highly complex, dynamic, nonlinear & exhibits temporal and spatial variability. A Geospatial technique was used for surface runoff estimation in Yarehalli micro-watershed which lies between 75° 51' 38" to 75 ° 53' 30" E longitudes and 13° 58' 59’ to the 140 01' 04" N latitudes in Davanagere district of Karnataka, India. The study reveals that, drainage pattern is dendritic with trunk order 2. The area, maximum length and width of the micro-watershed are 761.47 ha, 3.96 km and 2.92 km respectively. The mean value of bifurcation ratio is 14, it indicates micro-watershed has suffered less structural disturbance and the value of formfactor indicates micro-watershed is approaching towards elongated shape. The value of drainage density is 1.64 km km-2 which indicates the region is having permeable sub-soil material. NRCS Curve Number method was used to estimate the surface runoff which uses watershed characteristics & 5-day antecedent rainfall. This method estimated the runoff as 255.56 mm and the total volume of runoff is 194.6 ha m in the year 2020, which is 18.66% of total volume of rainfall. These results help in planning, development and management of available water resources in the Yarehalli micro-watershed. November,