Application Of Geo-Spatial Technology For Site Suitability of Rain Water Harvesting Structures
Site suitability studies for rainwater harvesting structures are an integral part of watershed management. It involves the integration of various types of data from different sources. Geo-Spatial Technology not only helps in acquiring data from different sources but also in its analysis. Geo-Spatial Technology involves Remote Sensing, GIS and GPS, and are increasingly used in resource analysis nowadays. Remote sensing is the first step instrumental to generating raw geographical data around natural resources and converting it into a database which is then used as an input for GIS analysis. GIS analysis is in turn instrumental in analyzing spatial and non - spatial data, to develop a model based on remote sensing data to arrive at a suitable natural resources development and management action plans. Applying these techniques in a synergistic manner is efficiently able to provide a mechanism for selection of suitable sites for rain water harvesting structures. In this study, an integrated approach involving, remote sensing and GIS-based methodology, is adopted for identifying the suitable sites for rainwater harvesting structures in the chosen study area located in the Solani watershed of Dehradun District, Uttara khand, India. IRS-1D P6 - LISS III &IV precision geocoded FCC data on 1:50,000 scale and field observation data were used for extracting thematic information such as geomorphology, geological structures, soil, land use landcover, well locations, drainage pattern etc. of the area. Slope map and flow accumulation maps were prepared using Survey of India toposheets on 1:50,000 scale. The various thematic layers from remote sensing as well as field-based observation data were uploaded into GIS software and numerous queries for spatial and non-spatial nature were performed. The suitable sites for installation of artificial recharge structures and water harvesting structures were identified.
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