Application of GIS Raster Calculator for determining Rain water harvesting Suitable sites In Wadi Soba - Khartoum - Sudan

Abstract

The relationship between water security and rainwater harvesting is negotiated as vital for water management system. Recently, the Sudan’s water management system adopted new implementation trends, which seek better utilization and suitable conservation. The main aim of this research is to apply raster calculator in the spatial analyst tools for determining the optimal locations for Rain Water Harvesting Reservoir (RWHR). Key criteria for operating the suitability analysis are four spatial thematic maps prepared as dataset (layers), which are, land cover, soils, slope, and settlements (villages). The key spatial layers processed using multi weighted criteria were depicted the suitable location where the reservoir can be constructed. Suitability scale ranges from suitable, moderate and low suitable areas over the catchment area. The capabilities of GIS functions in suitability analysis for RWHR site selection is optimized as far as more multi weighted criteria will have obtained for high optimal level