Groundwater Potential Zone delineation using GIS and Remote sensing Techniques in Sululta and Surrounding Watershed, Ethiopia
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Date
2019-10
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Abstract
Groundwater was recognized as one of the most valuable natural resources, immensely
important and dependable source of water supply in all climatic region of all over the world. The
general objective of this study was to delineate groundwater potential zones of Sululta and
Surrounding watershed using Geographical Information Systems and Remote Sensing
techniques. The present study integrated the thematic layers viz., Geomorphology, geology, soil,
slope, Land use/Land cover, drainage density, lineament density, rainfall and other related
features to delineate the groundwater potential zones using geo-informatics techniques.
Integration of various themes was achieved through the development of a models/assigned
weightages delineates groundwater potential zone and finally to generate a composite map.
About 20 bore wells yield data had been collected to quantify the yield from groundwater
potential zone map derived from geo-informatics. The final result map was reclassified into four
groundwater potential zones by integrating GIS and Remote Sensing techniques and weighted
overlay analysis with Analytical Hierarchy Process (AHP) methods. The classifications are very
high, high, moderate, and low groundwater potential zone. Weight age and ranking scores are
assigned to each thematic layer with respect of influencing rate of water percolation. Finally,
weight age, multiply by ranking and computed all the multiply values for delineation of
groundwater potential zones. The produced result was verified by comparing with the existing
groundwater borehole databases developed by the Department of Minerals and Geoscience,
Malaysia (JMG). The results show that there are good agreement between the predicted
groundwater potential map and the existing groundwater borehole database. The study
concludes that majority of the area covered by very high potential zones as it is supported by the
statistical data of groundwater borehole wells and the new generated predicted groundwater
potential map. The study suggested that, generated GWPZM will serve as useful guidelines for
planners, engineers and decision makers providing quick decision- making in the management of
groundwater resources.
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Keywords
Ground water Potential Zone, Remote Sensing, Geographic Information Systems