Your search found 6 records
1 Haile, M.; Shiferaw, A.. 1999. Efforts in land husbandry practices in Tigray. In Ewnetu, Z.; Haile, M.; Gebrehiwot, K. (Eds.), Land husbandry in the highlands of Ethiopia: Proceedings of a workshop, 10-14 November 1997, Mekelle University College, Mekelle, Ethiopia û Volume II. Nairobi, Kenya: ICRAF. pp.37-48.
Land management ; Soil degradation ; Soil conservation ; Water conservation ; Traditional farming ; Afforestation ; Institutions / Ethiopia / Tigray
(Location: IWMI-HQ Call no: P 6023 Record No: H030153)
2 Amede, Tilahun; Kassa, H.; Zeleke, G.; Shiferaw, A.; Kismu, S.; Melese, T. 2007. Working with communities and building local institutions for sustainable land management in the Ethiopian highlands. Mountain Research and Development, 27(1):15-19.
Land management ; Land degradation ; Rehabilitation ; Watershed management ; Social participation ; Development projects / Ethiopia
(Location: IWMI HQ Call no: IWMI 333 G136 AME Record No: H040592)
3 McCartney, Matthew P.; Shiferaw, A.; Seleshi, Y. 2008. Estimating environmental flow requirements downstream of the Chara Chara weir on the Blue Nile River. In Abtew, W.; Melesse, A. M. (Eds.). Proceedings of the Workshop on Hydrology and Ecology of the Nile River Basin under Extreme Conditions, Addis Ababa, Ethiopia, 16-19 June 2008. Sandy, UT, USA: Aardvark Global Publishing. pp.57-75.
Water management ; River basin management ; Ecology ; Rivers ; Environmental flows ; Environmental effects ; Downstream ; Weirs ; Hydrology ; Models ; Ecosystems ; Water power / Africa / Ethiopia / Sudan / Blue Nile River / Abay River / Chara Chara Weir / Lake Tana
(Location: IWMI HQ Call no: IWMI 577.64 G100 MCC Record No: H041346)
(1.27 MB)
Over the last decade flow in the Abay River (i.e., the Blue Nile) has been modified by operation of the Chara Chara weir and diversions to the Tis Abay hydropower stations, located downstream of the rivers source, Lake Tana. The most conspicuous impact of these human interventions has been significantly reduced flows over the Tis Issat Falls. This paper presents the findings of a hydrological study conducted to estimate environmental flow requirements downstream of the weir. The South African desktop reserve model was used to determine both high and low flow requirements in the reach containing the Falls. The results indicate that to maintain the basic ecological functioning in this reach requires an average annual allocation of 862 Mm3 (i.e. equivalent to 22% of the mean annual flow). Under natural conditions there was considerable seasonal variation, but the absolute minimum mean monthly allocation, even in dry years, should not be less than approximately 10 Mm3 (i.e. 3.7 m3s-1). These estimates make no allowance for maintaining the aesthetic quality of the Falls, which are popular with tourists. The study demonstrated that, in the absence of ecological information, hydrological indices can be used to provide a first estimate of environmental water requirements. However, to ensure proper management, much greater understanding of the relationships between flow and the ecological condition of the riverine ecosystem is needed.
4 Shiferaw, A.; McCartney, Matthew; Seleshi, Y.; Woldu, Z. 2008. Impacts of the Chara Chara Weir and environmental implications at the source of the Blue Nile River, Ethiopia. In Humphreys, E.; Bayot, R. S.; van Brakel, M.; Gichuki, F.; Svendsen, M.; Wester, P.; Huber-Lee, A.; Cook, S. Douthwaite, B.; Hoanh, Chu Thai; Johnson, N.; Nguyen-Khoa, Sophie; Vidal, A.; MacIntyre, I.; MacIntyre, R. (Eds.). Fighting poverty through sustainable water use: proceedings of the CGIAR Challenge Program on Water and Food, 2nd International Forum on Water and Food, Addis Ababa, Ethiopia, 10-14 November 2008. Vol.3. Water benefits sharing for poverty alleviation and conflict management; Drivers and processes of change. Colombo, Sri Lanka: CGIAR Challenge Program on Water and Food. pp.75-78.
River basins ; Flow ; Weirs ; Dams ; Benefits ; Environmental impact assessment ; Social impact / Ethiopia / Blue Nile River / Tis Issat Falls / Chara Chara Weir / Lake Tana
(Location: IWMI HQ Call no: IWMI 333.91 G000 HUM Record No: H041680)
http://cgspace.cgiar.org/bitstream/handle/10568/3708/IFWF2_proceedings_Volume%20III.pdf?sequence=1
https://vlibrary.iwmi.org/pdf/H041680.pdf
https://vlibrary.iwmi.org/pdf/H041680.pdf
5 McCartney, Matthew; Shiferaw, A.; Seleshi, Y. 2009. Estimating environmental flow requirements downstream of the Chara Chara weir on the Blue Nile River. Hydrological Processes, 23:3751-3758. [doi: https://doi.org/10.1002/hyp.7254]
Rivers ; Flow ; Ecosystems ; Dams ; Benefits ; Hydrology ; River basin management ; Models ; Environmental flows ; Water power ; Electrical energy ; Electricity supplies ; Water allocation / Ethiopia / Blue Nile River / Chara Chara weir / Tis Abay hydropower stations / Bahar Dar city / Tis Issat Falls / Lake Tana
(Location: IWMI HQ Call no: e-copy only Record No: H042242)
(0.20 MB)
Over the last decade, flow in the Abay River (i.e. the Blue Nile) has been modified by operation of the Chara Chara weir and diversions to the Tis Abay hydropower stations, located downstream. The most conspicuous impact of these human interventions is significantly reduced flows over the Tis Issat Falls. This paper presents the findings of a hydrological study conducted to estimate environmental flow requirements downstream of the weir. The Desktop Reserve Model (DRM) was used to determine both high and low flow requirements in the reach containing the Falls. The results indicate that to maintain the basic ecological functioning in this reach requires an average annual allocation of 862 Mm3 (i.e. equivalent to 22% of the mean annual flow). Under natural conditions there was a considerable seasonal variation, but the absolute minimum mean monthly allocation, even in dry years, should not be less than approximately 10 Mm3 (i.e. 3Ð7 m3 s1). These estimates make no allowance for maintaining the aesthetic quality of the Falls, which are popular with tourists. The study demonstrated that, in the absence of ecological information, hydrological indices can be used to provide a preliminary estimate of environmental flow requirements. However, to ensure proper management, much greater understanding of the relationships between flow and the ecological condition of the river ecosystem is needed.
6 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.
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