Insights from a multi-method recharge estimation comparison study

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dc.creatorWalker, D.
dc.creatorParkin, G.
dc.creatorSchmitter, Petra S.
dc.creatorGowing, J.
dc.creatorTilahun, Seifu A.
dc.creatorHaile, Alemseged Tamiru
dc.creatorYimam, A.Y.
dc.date2019-03
dc.date2018-12-04T04:49:21Z
dc.date2018-12-04T04:49:21Z
dc.date.accessioned2026-06-27T18:34:08Z
dc.descriptionAlthough most recharge estimation studies apply multiple methods to identify the possible range in recharge values, many do not distinguish clearly enough between inherent uncertainty of the methods and other factors affecting the results. We investigated the additional value that can be gained from multi-method recharge studies through insights into hydrogeological understanding, in addition to characterizing uncertainty. Nine separate groundwater recharge estimation methods, with a total of 17 variations, were applied at a shallow aquifer in northwest Ethiopia in the context of the potential for shallow groundwater resource development. These gave a wide range of recharge values from 45 to 814 mm/a. Critical assessment indicated that the results depended on what the recharge represents (actual, potential, minimum recharge or change in aquifer storage), and spatial and temporal scales, as well as uncertainties from application of each method. Important insights into the hydrogeological system were gained from this detailed analysis, which also confirmed that the range of values for actual recharge was reduced to around 280-430 mm/a. This study demonstrates that even when assumptions behind methods are violated, as they often are to some degree especially when data are limited, valuable insights into the hydrogeological system can be gained from application of multiple methods.
dc.identifierhttps://hdl.handle.net/10568/98422
dc.identifier.urihttp://hdl.handle.net/123456789/159658
dc.languageen
dc.publisherWiley
dc.rightsOpen Access
dc.sourceWalker, D.; Parkin, G.; Schmitter, Petra; Gowing, J.; Tilahun, S. A.; Haile, Alemseged T.; Yimam, A. Y. 2018. Insights from a multi-method recharge estimation comparison study. Groundwater, 14p. (Online first) doi: 10.1111/gwat.12801
dc.subjecthydrogeology
dc.subjectaquifers
dc.subjectgroundwater recharge
dc.subjectgroundwater flow
dc.subjectwater storage
dc.subjectwater resources development
dc.subjectwater levels
dc.subjectwater table
dc.subjectuncertainty
dc.subjectrain
dc.titleInsights from a multi-method recharge estimation comparison study
dc.typeJournal Article

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Instituto Internacional para el Manejo del Agua (IWMI)