Your search found 5 records
1 Alemayehu, T.; McCartney, Matthew; Kebede, S. 2009. Simulation of water resource development and environmental flows in the Lake Tana Sub basin. In Awulachew, Seleshi Bekele; Erkossa, Teklu; Smakhtin, Vladimir; Fernando, Ashra (Comps.). Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile. Intermediate Results Dissemination Workshop held at the International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia, 5-6 February 2009. Colombo, Sri Lanka: International Water Management Institute (IWMI). pp.23-37.
Lakes ; Water resources development ; Environmental flows ; Simulation models ; Irrigation schemes ; Water power ; Water demand / Ethiopia / Lake Tana / Chara Chara Weir
(Location: IWMI HQ Call no: IWMI 333.9162 G100 AWU Record No: H042505)
(0.50 MB)
Lake Tana is a natural reservoir for the Blue Nile River which has huge potential for hydropower and irrigation development. Water resource development is being encouraged by the government to stimulate economic growth and reduce poverty. In this study, the Water Evaluation And Planning (WEAP) model was used to simulate planned hydropower and irrigation development scenarios. Simulation of water demand and estimated downstream environmental flows was conducted for a 36-year period of varying flow and rainfall. Based on the simulation results, water availability for the different proposed irrigation and hydropower schemes was determined. The likely impact of future water resource development on water levels of the lake was assessed based on the simulation results of three development scenarios. The simulation results revealed that, if the full future development occurs, on average, 2,207 GWhy-1 of power could be generated and 548 Mm3y-1 of water could be supplied to irrigation schemes. However, the mean annual water level of the lake would be lowered by 0.33 meters (m) with a consequent decrease of 23 km2 in the average surface area of the lake. Besides having adverse ecological impacts, this would also have significant implications for shipping and the livelihoods of many local people.
2 McCartney, Matthew; Alemayehu, T.; Shiferaw, A.; Awulachew, Seleshi Bekele. 2010. Evaluation of current and future water resources development in the Lake Tana Basin, Ethiopia. Colombo, Sri Lanka: International Water Management Institute (IWMI). 31p. (IWMI Research Report 134) [doi: https://doi.org/10.3910/2010.204]
Lakes ; Weirs ; Environmental flows ; Water resources development ; Models / Ethiopia / Lake Tana Basin / Chara Chara Weir
(Location: IWMI HQ Call no: IWMI 333.91 G136 MAC Record No: H042875)
(925.49KB)
Lake Tana, located in the headwaters of the Blue Nile, is valuable for many people including the communities who live around the lakeshore and those who live immediately downstream. The area has been identified as a region for hydropower and irrigation development, vital for economic growth in Ethiopia. A multidisciplinary study was conducted to assess the possible impacts of this development. This study found that current development has benefited some local people but adversely affected others. Future development will exacerbate pressure on the lake. Hard choices must be made about how the water is best utilized. It is important that all stakeholders, including local people, are involved in the decision-making process.
3 Alemayehu, T.; McCartney, Matthew; Kebede, S. 2010. The water resource implications of planned development in the Lake Tana catchment, Ethiopia. Ecohydrology and Hydrobiology, 10(2-4):211-222. [doi: https://doi.org/10.2478/v10104-011-0023-6]
Water resources development ; Lakes ; Catchment areas ; Water levels ; Models ; Water demand / Ethiopia / Lake Tana
(Location: IWMI HQ Call no: e-copy only Record No: H044018)
(0.61 MB)
The water resources of the Lake Tana catchment are largely untapped. Currently,water resource development is being promoted to stimulate economic growth. This study utilized the WEAP model to determine the likely impact of a number of possible development scenarios on lake water levels. For each scenario, the model was used to simulate water demand in three sectors (i.e. irrigation, hydropower and downstream environmental flows) over a 36-year period of varying flow and rainfall. The simulation results revealed that if all the planned development occurs on average 2198 GWhy-1 power could be generated and 677 Mm3 y-1 of water supplied to irrigation schemes. However, the mean annual water level of the lake would be lowered by 0.44 meters. As well as adverse ecological impacts this would have significant implications for shipping and the livelihoods of local people.
4 McCartney, Matthew; Alemayehu, T.; Easton, Z. M.; Awulachew, Seleshi Bekele. 2012. Simulating current and future water resources development in the Blue Nile River Basin. In Awulachew, Seleshi Bekele; Smakhtin, Vladimir; Molden, David; Peden D. (Eds.). The Nile River Basin: water, agriculture, governance and livelihoods. Abingdon, UK: Routledge - Earthscan. pp.269-291.
River basins ; Water resources development ; Reservoirs ; Dams ; Water storage ; Water availability ; Evaporation ; Flow discharge ; Runoff ; Irrigation water ; Water power ; Electricity generation ; Models ; Climate change / Africa / Ethiopia / Sudan / Blue Nile River Basin
(Location: IWMI HQ Call no: IWMI Record No: H045321)
(1.39MB)
5 Alemayehu, T.. 2014. Spate irrigation in Ethiopia: potential, development status, and challenges. In Erkossa, Teklu; Hagos, Fitsum; Lefore, Nicole. (Eds.). Proceedings of the Workshop on Flood-based Farming for Food Security and Adaption to Climate Change in Ethiopia: Potential and Challenges, Adama, Ethiopia, 30-31 October 2013. Colombo, Sri Lanka: International Water Management Institute (IWMI). pp.23-39.
Irrigation systems ; Spate irrigation ; Flood irrigation ; Rain ; Drought ; Water resources ; Water distribution ; Diversion ; Water rights ; Farming systems ; Crops ; Productivity ; Land tenure / Ethiopia
(Location: IWMI HQ Call no: IWMI Record No: H046940)
(328 KB)
The paper highlights the current development status of spate irrigation in Ethiopia and its challenges. It discusses the huge potential of spate irrigation in Ethiopia and highlights the possibility of transforming this high spate potential to drought-prone lowland parts of the country and to growth centers. It also addresses the development attempts so far and the challenges faced, including traditional and modern practices. This article raises critical issues like land tenure systems and water and land use rights in areas where spate irrigation is practiced and where there are potential users of spate irrigation. Finally, it forwards its recommendations. Old, improved and combined spate irrigation practices are prevalent in Ethiopia. Most spate farms in the southeastern parts of the country are traditional. Improved spate irrigation is being implemented almost in all areas where there is traditional practice. Population pressure, natural calamities, and loss of the bulk of grazing lands in pastoral areas of the country have led to increased use of spate water. The recent, problem-driven, water-centered growth approach has given due emphasis to this potential, resulting in preparation of integrated land use plans and implementation of water-related projects in the lowlands. Lack of basic services like roads, potable water, power supply, and education coupled with harsh health issues like malaria, are hampering development in most spate irrigation areas. Sedimentation, change in stream/river morphology, and failure of structures are also some of the technical challenges. As spate water use increases, the problems of land tenure and water use rights grow. Modern land and water administration laws and regulations in spate irrigation areas have failed to address water rights; water allocation of perennial flows is different from spate irrigation water. Increased inequity and use conflict are seen in some areas. Defining the most beneficial agronomic practice of spate farms, introduction of market-oriented agriculture, conjunctive use of shallow groundwater and surface water, respecting the traditional rights of the pastoral communities and involving farmers in planning, designing and decision making are priority actions.
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