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Water Balance Study and Irrigation Strategies for Sustainable Management of a Tropical Ethiopian Lake: A Case Study of Lake Alemaya

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  • Shimelis Setegn
  • V. Chowdary
  • B. Mal
  • Fikadu Yohannes
  • Yasuyuki Kono

Abstract

Lake Alemaya in the Ethiopian Highlands has historically provided the surrounding area with water for domestic use, irrigation, and livestock and has served as a local fishery tank. Increasing irrigation and domestic water use, change in the local climate and changes in the surrounding land cover are believed to be the causes of Lake Alemaya’s demise. Expansion of major irrigated crops in particular chat (Catha Edulis), potato and vegetables and non-judicious use of irrigation water in the Lake Alemaya watershed led to presumption that irrigation is partly responsible for the withdrawal of large quantity of water from the lake. Thus, water balance study of Lake Alemaya was carried out under presumed scenarios in order to study the possible trends and fluctuations of the lake water level in response to proposed scenarios. Further, it is essential to study the irrigation performance for developing optimal irrigation schedules in the study area to make the best use of available water for long term sustainability of the water resources of Lake Alemaya. It was identified that expansion of the irrigated area in general and chat cultivation in particular in the study area have been the key to sustainable management of lake water, hence its expansion during the past 37 years (1965–2002) was studied through interpretation of satellite data. Subsequently, performance evaluation of the small-scale irrigation practices for major irrigated crops was carried out. Optimal irrigation schedules for different crop seasons were also developed for these irrigated crops using CROPWAT software. It was found that chat area increased from 190 ha in 1996 to nearly 330 ha in 2002. Further, it was observed that 43% surface area of the lake has reduced within a span of 37 years. Overall, maximum irrigation intensity of chat, potato and vegetables is observed during the first irrigation season of the crop calendar. Particularly, in case of chat, irrigation performance indicators such as Relative Water Supply (RWS), Relative Irrigation Supply (RIS), Depleted Fraction (DF) and Overall Consumed Ratio (OCR) values indicated poor performance of irrigation practices. From the analysis, it was found that the application of a fixed irrigation depth and fixed irrigation interval combinations of (25 mm—25 day), (20 mm—20 day), or (20 mm—25 day) are recommended for chat in the study area. Optimal irrigation schedules were decided on the basis of combination of irrigation interval and depth that results in low loss of irrigation water with reasonable yield reduction. Thus, determination of appropriate water management strategy can ensure proper utilization of the available water resources and improve the water application efficiency of the small-scale irrigation practices around Lake Alemaya, Ethiopia. Copyright Springer Science+Business Media B.V. 2011

Suggested Citation

  • Shimelis Setegn & V. Chowdary & B. Mal & Fikadu Yohannes & Yasuyuki Kono, 2011. "Water Balance Study and Irrigation Strategies for Sustainable Management of a Tropical Ethiopian Lake: A Case Study of Lake Alemaya," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 25(9), pages 2081-2107, July.
    • Handle: RePEc:spr:waterr:v:25:y:2011:i:9:p:2081-2107
    DOI: 10.1007/s11269-011-9797-y
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    2. Merchán, D. & Causapé, J. & Abrahão, R. & García-Garizábal, I., 2015. "Assessment of a newly implemented irrigated area (Lerma Basin, Spain) over a 10-year period. I: Water balances and irrigation performance," Agricultural Water Management, Elsevier, vol. 158(C), pages 277-287.
    3. Shimelis Beyene & Teshome H. Regassa & Belaineh Legesse & Martha Mamo & Tsegaye Tadesse, 2018. "Empowerment and Tech Adoption: Introducing the Treadle Pump Triggers Farmers’ Innovation in Eastern Ethiopia," Sustainability, MDPI, vol. 10(9), pages 1-12, September.
    4. Fitsum Assefa Adela & Joachim Aurbacher & Gumataw Kifle Abebe, 2019. "Small-scale irrigation scheme governance - poverty nexus: evidence from Ethiopia," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 11(4), pages 897-913, August.
    5. Mohammad Dastorani & Samaneh Poormohammadi, 2012. "Evaluation of Water Balance in a Mountainous Upland Catchment Using SEBAL Approach," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(7), pages 2069-2080, May.
    6. Zhou, Hong & Zhao, Wen zhi, 2019. "Modeling soil water balance and irrigation strategies in a flood-irrigated wheat-maize rotation system. A case in dry climate, China," Agricultural Water Management, Elsevier, vol. 221(C), pages 286-302.
    7. Adela, F.A. & Aurbacher, J., 2018. "Access to irrigation water-poverty nexus: Application of an Endogenous Switching Regression in Ethiopia," 2018 Conference, July 28-August 2, 2018, Vancouver, British Columbia 277521, International Association of Agricultural Economists.
    8. Daniela D’Agostino & Alessandra Scardigno & Nicola Lamaddalena & Daniel Chami, 2014. "Sensitivity Analysis of Coupled Hydro-Economic Models: Quantifying Climate Change Uncertainty for Decision-Making," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(12), pages 4303-4318, September.

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