Site Suitability Analysis for Rain Water Harvesting Structures Using Remotesensing and GIS Techniques

摘要

Assessing, managing and planning of water resources for sustainable use become an important issue in human life. Harvesting of available runoff at a micro level for storage and recycling is necessary for better utilization of rainfall, control of erosion etc. Integration of remote sensing and geographical information system (GIS) techniques provides reliable, accurate and update database on land and water resources. To illustrate this concept, a case study was carried out for Hire watershed of Malaprabha River basin. The satellite data provided by IRS-1C was geo-referenced and rectified with the base map. The cross operation was performed between land-use map and soil textural map. The cross- map was filtered using maps of land use, soil texture, classified slope and run off potential. Decision rules for different water harvesting structures were formulated and adopted. Water balance calculations are done for individual water holding zones and the runoff potential map was generated for various zones. Different structures were identified by integration of the maps of land use, soil texture, classified slope and run off potential the sites found for various structured were checked by overlaying the drainage map. From the water balance study it is found that there is no surplus water available for runoff in most of the soil moisture classes (combination of land use and soil texture). It indicates the hydrological drought condition in the region.