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Monitoring water quality and quantity is crucial to be sure that water resources are sustainably used. However, there is no monitoring system of water quantity and quality in southwestern Ethiopia, despite expansion of agricultural activities demanding water resources. The objective of this study was to investigate the effect of agriculture on water quantity and quality with special emphasis on irrigation in southwestern Ethiopia. Data of water quantity was collected from four rivers and four irrigation canals during dry season of 2023. Physico-chemical water quality data was collected from 35 sites. Water quantity was calculated by estimating the water discharge of the rivers and irrigation canals. Weighted arithmetic water quality index was calculated to assess the status of the studied rivers. Principal component analysis was used to identify the relation of the sites with water quality parameters. This study revealed that the average amount of abstracted water for irrigation from the four studied rivers was 22,399 m 3 /day during the studied period, and the average percentage of abstracted water was 17%. Sites downstream of the irrigation site were characterized by poor water quality compared with the upstream sites. Sites surrounded by agricultural land use were correlated with chemical oxygen demand, electric conductivity, nitrate, orthophosphate, water temperature, and pH, whereas all sites surrounded by forest were positively correlated with dissolved oxygen. This study indicates that agricultural activities have a negative impact on surface water quality and quantity if not managed properly. Hence, we recommend sustainable use of water resources for the planned irrigation expansion.

Titel:	Effect of agriculture on surface water quantity and quality in Gilgel Gibe watershed, southwestern Ethiopia.
Autor/in / Beteiligte Person:	Chawaka, SN ; Boets, P ; Mereta, ST ; Goethals, PLM ; Ancha, VR
Link:	Full Text Finder (Volltext)
Zeitschrift:	Environmental monitoring and assessment, Jg. 196 (2024-05-25), Heft 6, S. 578
Veröffentlichung:	1998- : Dordrecht : Springer ; <i>Original Publication</i>: Dordrecht, Holland ; Boston : D. Reidel Pub. Co., c1981-, 2024
Medientyp:	academicJournal
ISSN:	1573-2959 (electronic)
DOI:	10.1007/s10661-024-12732-w
Schlagwort:	Ethiopia Agricultural Irrigation Water Pollutants, Chemical analysis Water Supply statistics & numerical data Nitrates analysis Agriculture Environmental Monitoring Water Quality Rivers chemistry
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Environ Monit Assess] 2024 May 25; Vol. 196 (6), pp. 578. <i>Date of Electronic Publication: </i>2024 May 25. MeSH Terms: Agriculture* ; Environmental Monitoring* ; Water Quality* ; Rivers* / chemistry ; Ethiopia ; Agricultural Irrigation ; Water Pollutants, Chemical / analysis ; Water Supply / statistics & numerical data ; Nitrates / analysis References: Alavaisha, E., Lyon, S. W., & Lindborg, R. (2019). Assessment of water quality across irrigation schemes: A case study of wetland agriculture impacts in Kilombero Valley, Tanzania. Water, 11(4), 671, https://www.mdpi.com/2073-4441/11/4/671. ; Alavaisha, E., Mbande, V., Börjeson, L., & Lindborg, R. (2021). Effects of land use change related to small-scale irrigation schemes in Kilombero Wetland. Tanzania. Frontiers in Environmental Science, 9, 611686. https://doi.org/10.3389/fenvs.2021.611686. 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Effect of agriculture on surface water quantity and quality in Gilgel Gibe watershed, southwestern Ethiopia.