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GIS-Based Watershed Analysis for Water Storage Facilities in Underdeveloped Areas: Case of a Gravity Hill in Saudi Arabia
Abstract
Digital elevation models (DEMs) are created to study the topography of the area by using point krigging method of gridding. The results show a significant level difference between the start and end points of the valley sloping naturally. A longitudinal profile shows an average slope of 2.6% in a stretch of 15 km inside the area under study. Later, the detailed watershed and runoff analysis have been performed by preparing various maps using IDF curves available for the area. The area is found to experience sufficient rainfall for a 50 to 100-year storm return period. The expected location and amount of runoff water accumulation have also been determined which may help for the construction of water storage or rainwater harvesting facilities. The chapter shows the role of GIS-based techniques for the hydrological analysis of difficult terrains which can be applied for planning and management of water storage facilities in underdeveloped areas.
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