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Multi-method groundwater recharge estimation at Eshito micro-watershed, Rift Valley Basin in Ethiopia

Lookup NU author(s): Dr David Walker, John Gowing, Dr Geoffrey Parkin

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Taylor and Francis , 2020.

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Abstract

Understanding recharge processes is fundamental to improve sustainable groundwater resource management. Shallow groundwater (SGW) is being developed for multiple purposes in Ethiopia without consideration of monitoring. We established a citizen science-based hydro-meteorological monitoring network, with a focus on SGW recharge estimation, in Eshito micro-watershed, Ethiopia. Citizen scientists collected rainfall, groundwater-level and stream water-level data. We characterized the shallow aquifer using pumping tests. The data were used to estimate SGW recharge using three methods: chloride mass balance, water-level fluctuation (WLF) and baseflow separation. Approximately 20% and 35% of annual rainfall amount contributes to recharge based on the chloride mass balance and WLF results, respectively. Baseflow separation showed recharge values for the watershed vary from 38% to 28% of annual rainfall at the upstream and downstream gauging stations, respectively. This study shows that the recharge in previously unmonitored micro-watersheds can be studied if citizens are involved in data generation.


Publication metadata

Author(s): Mintamer F, Haile AT, Walker D, Gowing J, Parkin G

Publication type: Article

Publication status: Published

Journal: Hydrological Sciences Journal

Year: 2020

Volume: 65

Issue: 9

Pages: 1596-1605

Online publication date: 29/04/2020

Acceptance date: 24/03/2020

Date deposited: 18/06/2020

ISSN (print): 0262-6667

ISSN (electronic): 2150-3435

Publisher: Taylor and Francis

URL: https://doi.org/10.1080/02626667.2020.1762887

DOI: 10.1080/02626667.2020.1762887


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