American Journal of Water Resources
ISSN (Print): 2333-4797 ISSN (Online): 2333-4819 Website: http://www.sciepub.com/journal/ajwr Editor-in-chief: Apply for this position
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American Journal of Water Resources. 2020, 8(4), 182-190
DOI: 10.12691/ajwr-8-4-4
Open AccessArticle

Groundwater Recharge Zone Mapping Using GIS-based Analytical Hierarchy Process and Multi-Criteria Evaluation: Case Study of Greater Banjul Area

Adama Gassama Jallow1, 2, , Djim M. L Diongue3, Huguette C. Emvoutou4, Daouda Mama1 and Serigne Faye3

1Abomey Calavi University, Benin

2Ministry of Petroleum and Energy, Banjul, Gambia

3Geology Department, Cheikh Anta Diop University of Dakar, Senegal

4Department of Earth Science, University of Douala, Cameron

Pub. Date: September 01, 2020

Cite this paper:
Adama Gassama Jallow, Djim M. L Diongue, Huguette C. Emvoutou, Daouda Mama and Serigne Faye. Groundwater Recharge Zone Mapping Using GIS-based Analytical Hierarchy Process and Multi-Criteria Evaluation: Case Study of Greater Banjul Area. American Journal of Water Resources. 2020; 8(4):182-190. doi: 10.12691/ajwr-8-4-4

Abstract

Remote sensing (RS) and Geographic Information System (GIS) play a crucial role in understanding groundwater potential recharge in semi-arid areas. In this present study, groundwater recharge zone map is delineated for the shallow aquifer in the Greater Banjul Area (GBA) using GIS, RS and Multi-Criteria Evaluation (MCE) technique utilizing seven criteria (geology, land-use/cover, slope, drainage density, soil texture, groundwater fluctuation and aquifer transmissivity). Analytical Hierarchical Process (AHP) is used as MCE technique to normalize the weights of the various criterion. Each class of the different themes was assigned suitable score and normalized using a Fuzzy membership algorithm. Thematic layers were integrated using Weighted Linear Combination (WLC) in a GIS platform to generate groundwater recharge zone maps. The recharge map thus obtained was divided into four classes (poor, moderate, good, and very good) based on their influence to groundwater recharge. Results indicates that about 10.5 % of the total study area falls under ‘poor’ and ‘moderate’ zone and cover the estuarian portion of GBA, 40% of the total area falls under ‘very good’ zone which is a good indication for future artificial recharge planning and potential drilling of boreholes.

Keywords:
groundwater recharge zone multi-criteria evaluation greater Banjul area

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