Hydrogeomorphological Mapping Upto Cadastral Level, By Using High Resolution Satellite Data In Gokaphaslwada Watershed, Doulthabad Mandal, Mahabubnagar District

Abstract

Mahabunagar District falls in rain shadow zone with a low annual normal rainfall of 604 mm. The recurrence of drought is increasing considerably and unless collective measures are initiated on a permanent basis the situation will become grim in future. Gokaphasalwada watershed in Mahabubnagar District is selected to demonstrate the capability of high resolution satellite data in ground water mapping at village level. This watershed is located in Survey of India toposheet Nos. 56H/9 NW. This watershed with an area of about 57 sq.km is underlined by granite gneiss and migmatite traversed by dolerite dykes. Hydrogeomorphological mapping was carried out on 1:10,000 scale using IRS-P6 LISS-IV satellite data. The satellite data facilitates to update the extent of built-up area, road and drainage network. Further, the revenue villages enclosed in the watershed are digitized, geo-referenced, mosaicked and superimposed on hydrogeomorphology map. This helps to give site specific recommendation and proposing survey number wise water harvesting structures which will improve the ground water resources.