Multi-criteria decision evaluation in groundwater zones identification in Moyale-Teltele subbasin, South Ethiopia
Abstract:The conventional approaches such as ground-based surveys and exploratory drilling for groundwater investigation are time-consuming and uneconomical. Systematic organisation of data of characteristics of any terrain, evaluation of inter-thematic, interclass dependencies and variability, and also analysing cumulative effect on the development of groundwater regime is the best approach which the current decade requires. This is proved by generation of the thematic information on the above factors through remote sensing technique, and integration in geographic information system (GIS) for evaluation using multi-criteria decision-making techniques. This paper presents the results of the attempt made to identify the groundwater potential zones in the Moyale-Teltele Sub basin of the Genale Dawa River Basin in South Ethiopia using the integrated approaches of remote sensing and geographic information systems. Six geologic, physiographic, and hydrologic factors were applied namely: lithology, structure, geomorphology, slope, land cover, and drainage. Weighted Overlay Analysis using multicriteria decision technique is implemented to produce the groundwater potential map of the area. This result is further verified by groundwater yield data of boreholes and springs collected in the field and from previous reports. The validation revealed that the result is in good conformity with the actual yield of the wells and springs.
Document Type: Research Article
Publication date: 2009-01-01