Abstract
Abstract. Rajasthan is a region with very limited water resources. Water is the most crucial for maintaining an environment and ecosystem conducive to sustaining all forms of life. The principle of watershed management is the proper management of all the precipitation by the way of collection, storage and efficient utilization of runoff water and to recharge the ground water. The present study aim's to identify suitable zones for water harvesting structures in Pisangan watershed of Ajmer district, Rajasthan by using Geographic Information System (GIS) and Multi Criteria Evaluation (MSE). Multi criteria evaluation is carried out in Geographic Information system to help the decision makers in determining suitable zones for water harvesting structures based on the physical characteristics of the watershed. Different layers which were taken into account for multi criteria evaluation are; Soil texture, slope, rainfall data (2000–2012), land use/cover, geomorphology, lithology, lineaments, drainage network. The soil conservation service model was used to estimate the runoff depth of the study area Analytical Hierarchy Processes (AHP) is used to find suitable water harvesting structures on the basis of rainfall. Produced suitability map will help in the selection of harvesting structures such as percolation tanks, storage tank, check dams and stop dams.
Highlights
The groundwater table in most parts of Rajasthan is steadily going down due to over-exploitation and inadequate natural recharge, resulting from frequent drought conditions in a region where the erratic annual rainfall is below 50-60 cm in most parts
Curve Number is evaluating for the study area on pixel basis using the land cover/land use and soil map that are reclassified to hydrologic conditions and hydrologic soil group (Table1 ).Infiltration depends on the soil property which effects the relation between rainfall and runoff
Geographic information system(GIS), a spatial as well as non spatial database management system, enables us to manage a large volume of data from a variety of sources.Geographic Information System (GIS) stores, retrieve, manipulate and analyze and present the data according to the user defined specification, and is an ideal tool in advanced site-selection studies
Summary
The groundwater table in most parts of Rajasthan is steadily going down due to over-exploitation and inadequate natural recharge, resulting from frequent drought conditions in a region where the erratic annual rainfall is below 50-60 cm in most parts. “Each watershed has various physiographic characteristics of the study area such as geomorphology, geology, structures, landuse/landcover, soil & drainage pattern integrated with the help of Remote sensing and GIS techniques. Aggarwal et al, (2008) “study deals with the potential sites for construction of rain water harvesting structures in the Bakhar watershed of Mirzapur district, UP. It has been identified by using remote sensing and GIS technology. Using GIS and AHP, the present study endeavours to locate the site for water harvesting structures in Pisangan Watershed. The lithology units present in watershed having moderate to high rain runoff potential which are being used to conserve water by making scientific water harvesting structures with proper management. In Ajmer district land forms have been classified on the basis of genetic factor and the geomorphic processes involved
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
