Action plan preparation (Medak Nala) and impact assessment (katangidda nala) of watersheds in gulbarga district using remote sensing and gis technologies
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Date
2006
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UAS Dharwad
Abstract
Action plan preparation of Medak Nala watershed and impact assessment of
Katangidda Nala watershed were carried out using remote sensing and GIS technologies.
Satellite data of IRS- 1C/1D for two seasons representing rabi (December 8 and 10, 2000
PAN + LISS III merged) and summer (March 15, 2001 LISS III) were used for preparing
thematic maps and suggesting action plans for management of natural resources in Medak
Nala watershed. Impact assessment of IWDP programme in Katangidda Nala watershed was
done using IRS 1C/1D data of LISS III image of December 11, 1997 (pre-treatment) and
November 15, 2002 (post-treatment).
The water and agriculture resources action plans of Medak Nala watershed were
prepared by integrating the thematic maps such as land use/land cover, soil resource
inventory, hydro-geomorphology, slope etc. The results indicated that the present land use of
the watershed (5,169 ha, 42.58%) is under kharif crop followed by rabi crop area (2,814 ha,
23.18%) and land with scrub (2,280 ha, 18.78%). The 20 soil series of the watershed were
classified under Inceptisols, Alfisols, Vertisols and Entisols.
Results of impact assessment of Katangidda Nala watershed revealed that the area
under agriculture crops and forest land were increased by 671 ha (5.7%) and 1,414 ha
(11.94%) respectively. This is due to the fact that more areas of waste lands and fallow lands
were brought into cultivation. The vegetation vigour of the area was classified into three
classes using NDVI. Substantial increase in the area under high and low biomass levels was
observed (502 ha and 19 ha respectively). The benefit-cost analysis indicated that the use of
remote sensing and GIS was cheaper by 2.2 times than that of conventional methods.