Groundwater Recharge Research Paper

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CHAPTER FIVE RESULTS AND DISCUSSIONS
5.1 Concepts of Groundwater Recharge Evaluation
In a broader sense, groundwater recharge is defined by as water that reaches an aquifer from any direction, i.e., down, up, or laterally. In the upper awash catchment, groundwater recharge by downward flow of water through the unsaturated zone is generally the most important mode of recharge. Therefore, groundwater recharge as used in this study refers to the downward flow of water reaching the water table from the unsaturated zone (Freeze and Cherry, 1979; Lerner et al., 1990). When water is supplied to the soil surface, some of the arriving water penetrates the surface and is absorbed into the soil, while some may fail to penetrate …show more content…

Based on the assumption above, the catchment is water hard to move and no subsurface movement of water towards the defined watershed, to carry out the water balance on long term averaged data equation can be reduced in to:- P= AET+ Ro± ∆S……………………………………… (5.3) R=P-AET-SRO Where, P=1015.77 mm, AET= 710mm, SRO= 139.68 mm R= 1015.77 mm -710mm-139.68mm R= 166.09mm/year
Using the above formula, the recharge of the upper awash catchment is 166.09mm/year which is 16.4% of annual precipitation is recharged. Groundwater recharge evaluated in the Upper Awash catchment takes place in three months (June to August). In contrast in the other month’s groundwater bring about to AET and total runoff, and also this circumstances is caused to be visible by negative value of

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