Your search found 3 records
1 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
2 Shiferraw, A.; McCartney, Matthew. 2008. Investigating environmental flow requirements at the source of the Blue Nile River. Paper presented at the International Nile Basin Development Forum, Khartoum, Sudan, 3-5 November 2008. 14p.
Lakes ; Rivers ; Flow ; Hydrology ; Ecosystems ; Ecology ; Water allocation ; Weirs ; Water power ; Models / Ethiopia / Lake Tana / Blue Nile River / Abay River / Chara Chara Weir / Tis Abay Hydropower Station / Tis Issat Falls
(Location: IWMI HQ Call no: e-copy only Record No: H041853)
(0.06 MB) (0.06 MB)
3 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.
Powered by DB/Text WebPublisher, from
