Action plan preparation Medak Nala and impact assessment katangidda nala of watersheds in gulbarga district using remote sensing and gis technologies

Abstract

Action plan preparation of Medak Nala watershed and impact assessment of newlineKatangidda Nala watershed were carried out using remote sensing and GIS technologies. newlineSatellite data of IRS- 1C/1D for two seasons representing rabi (December 8 and 10, 2000 newlinePAN + LISS III merged) and summer (March 15, 2001 LISS III) were used for preparing newlinethematic maps and suggesting action plans for management of natural resources in Medak newlineNala watershed. Impact assessment of IWDP programme in Katangidda Nala watershed was newlinedone using IRS 1C/1D data of LISS III image of December 11, 1997 (pre-treatment) and newlineNovember 15, 2002 (post-treatment). newlineThe water and agriculture resources action plans of Medak Nala watershed were newlineprepared by integrating the thematic maps such as land use/land cover, soil resource newlineinventory, hydro-geomorphology, slope etc. The results indicated that the present land use of newlinethe watershed (5,169 ha, 42.58%) is under kharif crop followed by rabi crop area (2,814 ha, newline23.18%) and land with scrub (2,280 ha, 18.78%). The 20 soil series of the watershed were newlineclassified under Inceptisols, Alfisols, Vertisols and Entisols. newlineResults of impact assessment of Katangidda Nala watershed revealed that the area newlineunder agriculture crops and forest land were increased by 671 ha (5.7%) and 1,414 ha newline(11.94%) respectively. This is due to the fact that more areas of waste lands and fallow lands newlinewere brought into cultivation. The vegetation vigour of the area was classified into three newlineclasses using NDVI. Substantial increase in the area under high and low biomass levels was newlineobserved (502 ha and 19 ha respectively). The benefit-cost analysis indicated that the use of newlineremote sensing and GIS was cheaper by 2.2 times than that of conventional methods. newline