• Chalapathi K
• Dr. Mohammed Inayathulla

Design rainfall values are generally expressed in the form of point rainfall values which is the rainfall depth at a location. In order to obtain areal average values for an area, hydrologists and engineers require techniques where by point rainfall amounts can be transformed to average rainfall amounts over a specified area. The study area chosen was Kolar Taluk Sub watersheds, Kolar District since it was found in the rocks and granite area of Karnataka state, India. The study area covers an area of 793.20 km2 and comprise of 24 sub watersheds. In the present study Daily rainfall data of Kolar Taluk was collected from statistical department M S Buildings, Bangalore. The isohyetal maps were developed by using the rainfall for a particular duration and return period by using spatial interpolation tool in software ArcGIS. The isohyetal map gives the spatial distribution of rainfall depth for Kolar Taluk Region. For the construction of DAD curves, the area between the contours were extracted from isohyetal maps from 5 stations with 25 years rainfall data using ArcGIS and the DAD curves were generated. Prepared curves will be used in designing structures for water resources to know the areal spread of rainfall within watershed and also to know the amount of high rainfall that may be expected over the catchment.

Watershed, Rainfall, Isohyet Map, Depth – Area - Duration Curves

"INVESTIGATION OF DEPTH – AREA- DURATION CURVES FOR KOLAR TALUK REGION USING GEOSPATIAL APPROACH", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 3, page no.c470-c479, March-2022, Available :http://www.jetir.org/papers/JETIR2203262.pdf

"INVESTIGATION OF DEPTH – AREA- DURATION CURVES FOR KOLAR TALUK REGION USING GEOSPATIAL APPROACH", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 3, page no. ppc470-c479, March-2022, Available at : http://www.jetir.org/papers/JETIR2203262.pdf