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Effect of irrigation water withdrawal on the hydrology of the Lake Tana sub-basin

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Title Effect of irrigation water withdrawal on the hydrology of the Lake Tana sub-basin
 
Creator Taye, Meron Teferi
Haile, Alemseged Tamiru
Fekadu, A. G.
Nakawuka, P.
 
Subject irrigation water
water extraction
hydrology
irrigation schemes
small scale systems
water balance
dry season
water availability
water scarcity
irrigated land
hydroclimatology
crop production
water requirements
water use
rivers
smallholders
farmers
 
Description Study region: The Lake Tana sub-basin, upper Blue Nile, Ethiopia.
Study focus: The Lake Tana sub-basin is one of the agricultural growth corridors for Ethiopia’s ambitious plan to expand irrigation. Despite the booming irrigation activities in the sub-basin, limited information exists on the rate of irrigation expansion and its impact on the water balance of the sub-basin. This study collected and organized smallholder irrigation data in the subbasin to identify the actual irrigated area, the abstracted irrigation water, and its implications on seasonal water availability. The area under small-scale irrigation was estimated through data obtained from ’woredas’ (districts) databases. Crop patterns were obtained through field surveys. Irrigation water abstracted at daily timescale was measured.
New hydrological insights for the Region: In the sub-basin, 38,694 ha was under small-scale irrigation in 2020/21. Surface water is the dominant water source, and it supplies about 80% of irrigation withdrawal. Water abstraction for small-scale irrigation is about 430 MCM per dry season (~50% of dry season flow). The eastern side of the sub-basin faces water shortages as the dry season flow is not sufficient for irrigation. With the prospects of more irrigation expansion, small-scale irrigation water withdrawals pose concerns of water scarcity at local level and to the water balance of the sub-basin. Hence, there is urgent need for adaptive management of the small-scale irrigation effect on the sub-basin’s hydrology.
 
Date 2021-12
2021-11-24T20:19:38Z
2021-11-24T20:19:38Z
 
Type Journal Article
 
Identifier Taye, Meron Teferi; Haile, Alemseged Tamiru; Fekadu, A. G.; Nakawuka, P. 2021. Effect of irrigation water withdrawal on the hydrology of the Lake Tana sub-basin. Journal of Hydrology: Regional Studies, 38:100961. [doi: https://doi.org/10.1016/j.ejrh.2021.100961]
2214-5818
https://hdl.handle.net/10568/116264
https://www.sciencedirect.com/science/article/pii/S2214581821001907/pdfft?md5=7e540b0f0dc1c7747491b5c5fb401376&pid=1-s2.0-S2214581821001907-main.pdf
https://doi.org/10.1016/j.ejrh.2021.100961
Land and Water Solutions
H050794
 
Language en
 
Rights CC-BY-NC-ND-4.0
Open Access
 
Format 38:100961
 
Publisher Elsevier BV
 
Source Journal of Hydrology: Regional Studies