Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia
Study region: Lake Tana sub-basin of the Upper Blue Nile River Basin, Ethiopia Study focus: Groundwater use for small-scale irrigation is increasing in the Lake Tana sub-basin. However, the abstraction amount and its impact are not well understood. In this study, a new methodological approach was ut...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Journal of Hydrology: Regional Studies |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581823000526 |
| _version_ | 1797867615263129600 |
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| author | Sileshi Mamo Fantaye Behailu Birhanu Wolde Alemseged Tamiru Haile Meron Teferi Taye |
| author_facet | Sileshi Mamo Fantaye Behailu Birhanu Wolde Alemseged Tamiru Haile Meron Teferi Taye |
| author_sort | Sileshi Mamo Fantaye |
| collection | DOAJ |
| description | Study region: Lake Tana sub-basin of the Upper Blue Nile River Basin, Ethiopia Study focus: Groundwater use for small-scale irrigation is increasing in the Lake Tana sub-basin. However, the abstraction amount and its impact are not well understood. In this study, a new methodological approach was utilized to estimate the irrigation water abstraction amount, which is based on groundwater level monitoring before, during, and at the end of the irrigation season (2021/2022). The monitoring was conducted on 361 hand-dug wells distributed throughout the sub-basin, which is subdivided into East, Southwest, and North zones. New hydrological insights for the region: Groundwater abstraction for irrigation and associated groundwater level decline estimates are 10.6 × 106 m3 and 2.43 m in the East, 4.2 × 106 m3 and 3.23 m in the Southwest, and 0.6 × 106 m3 and 1.32 m in the North. These abstractions account for 103%, 97%, and 62% of the mean annual groundwater recharge in the East, Southwest, and North zones, respectively. Groundwater is overexploited in the East and Southwest zones although, at the sub-basin scale, the amount of groundwater used for irrigation is small compared to the renewable groundwater resource. However, if groundwater-based irrigation continues to expand especially in the East and Southwest zones, groundwater scarcity at the local scales will worsen. Adaptive management strategies are required to minimize the potential adverse effects on groundwater resources. |
| first_indexed | 2024-04-09T23:44:03Z |
| format | Article |
| id | doaj.art-b1fcf8f160ed43b98be17e57c8a35d3a |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-04-09T23:44:03Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-b1fcf8f160ed43b98be17e57c8a35d3a2023-03-18T04:41:22ZengElsevierJournal of Hydrology: Regional Studies2214-58182023-04-0146101365Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, EthiopiaSileshi Mamo Fantaye0Behailu Birhanu Wolde1Alemseged Tamiru Haile2Meron Teferi Taye3Geology Department, School of Earth Sciences, Bahir Dar University, P.O. Box 79, Bahir Dar, EthiopiaSchool of Earth Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia; Corresponding author.International Water Management Institute, Addis Ababa, EthiopiaInternational Water Management Institute, Addis Ababa, EthiopiaStudy region: Lake Tana sub-basin of the Upper Blue Nile River Basin, Ethiopia Study focus: Groundwater use for small-scale irrigation is increasing in the Lake Tana sub-basin. However, the abstraction amount and its impact are not well understood. In this study, a new methodological approach was utilized to estimate the irrigation water abstraction amount, which is based on groundwater level monitoring before, during, and at the end of the irrigation season (2021/2022). The monitoring was conducted on 361 hand-dug wells distributed throughout the sub-basin, which is subdivided into East, Southwest, and North zones. New hydrological insights for the region: Groundwater abstraction for irrigation and associated groundwater level decline estimates are 10.6 × 106 m3 and 2.43 m in the East, 4.2 × 106 m3 and 3.23 m in the Southwest, and 0.6 × 106 m3 and 1.32 m in the North. These abstractions account for 103%, 97%, and 62% of the mean annual groundwater recharge in the East, Southwest, and North zones, respectively. Groundwater is overexploited in the East and Southwest zones although, at the sub-basin scale, the amount of groundwater used for irrigation is small compared to the renewable groundwater resource. However, if groundwater-based irrigation continues to expand especially in the East and Southwest zones, groundwater scarcity at the local scales will worsen. Adaptive management strategies are required to minimize the potential adverse effects on groundwater resources.http://www.sciencedirect.com/science/article/pii/S2214581823000526Groundwater level monitoringIrrigation abstractionGroundwater rechargeLake Tana sub-basinEthiopia |
| spellingShingle | Sileshi Mamo Fantaye Behailu Birhanu Wolde Alemseged Tamiru Haile Meron Teferi Taye Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia Journal of Hydrology: Regional Studies Groundwater level monitoring Irrigation abstraction Groundwater recharge Lake Tana sub-basin Ethiopia |
| title | Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia |
| title_full | Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia |
| title_fullStr | Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia |
| title_full_unstemmed | Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia |
| title_short | Estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the Lake Tana sub-basin, Ethiopia |
| title_sort | estimation of shallow groundwater abstraction for irrigation and its impact on groundwater availability in the lake tana sub basin ethiopia |
| topic | Groundwater level monitoring Irrigation abstraction Groundwater recharge Lake Tana sub-basin Ethiopia |
| url | http://www.sciencedirect.com/science/article/pii/S2214581823000526 |
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