Watershed Action Plan for South Saurastra Region in Compliance with Changing Rainfall Patterns, Using Remote Sensing and GIS Techniques

An attempt has been made for watershed development planning of village Jalondar (Dist.-Junagadh) of the south saurastra region of Gujarat using Remote Sensing and GIS Techniques. Out of five microwatersheds in the village area, a micro-watershed having an area of 602.83 ha was selectedfor preparing the action plan. Maps on various themes such as land use/land cover, soil texture, slope and drainage pattern were prepared using remote sensing image (IRS P6 LISS IV image) and Arc View and ENVI software's. Arc View software was used for preparation of thematic maps while the Environment for Visualizing Images (ENVI) software was used for registration and superimposition of cadastral map with thematic maps. Rational method was used to estimate the peak runoff rate while curve number method was used to estimate the runoff volume. Information available fromvarious thematic maps was used for designing various soil and water conservation measures such as contour bunding, staggered contour trenches, continuous contour trenches, loose rock dams and water harvesting structures. Annual water storage capacities of suggested structures were estimated as 69.89, 14.10, 9.45, 1.48 and 6.78 ha-m respectively. The suggested conservation measures conserve 100% rainwater of watershed at more than 70 percent probability of rainfall.