Your search found 11 records
1 Gebre, A.; Getachew, D.; McCartney, Matthew. 2008. Stakeholder analysis of the Chara Chara Weir, Lake Tana. A study report submitted to IWMI. 54p.
Weirs ; Lakes ; Water resource management ; Water supply ; Irrigation water ; Electricity supplies ; Organizations ; Institutions / Ethiopia / Tana Lake / Abbay River / Chara Chara Weir
(Location: IWMI HQ Call no: IWMI 333.9163 G136 GEB Record No: H040846)
(0.67 MB)
2 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.
3 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
4 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)
5 Alemayehu, Tadesse; McCartney, Matthew; Kebede, S. 2009. Modelling to evaluate the water resource implications of planned infrastructure development in the Lake Tana sub-basin, Ethiopia. Paper presented at the Conference on Applying Water Evaluation And Planning System (WEAP) as a Decision Support System (DSS) for IWRM, Damascus, Syria, 25-27 May 2009. 22p.
Lakes ; Water resources development ; Evaluation ; Environmental effects ; Simulation models ; Decision support tools ; Water power ; Irrigation programs ; Water demand / Ethiopia / Lake Tana sub-basin / Chara Chara weir
(Location: IWMI HQ Call no: e-copy only Record No: H042207)
(0.35 MB) (0.35 MB)
Lake Tana is important for domestic water supply, hydropower, fisheries, grazing and water for livestock, as well as reeds for boat construction. It is also important for water transport and as a tourist destination. Currently, the water resources of the catchment are largely untapped. However, water resource development is being encouraged to stimulate economic growth and reduce poverty. In this study, the Water Evaluation And Planning (WEAP) model was used to determine the water availability for different irrigation and hydropower schemes proposed. Three development scenarios were simulated and the likely impact of future water resource development on lake water levels was assessed. 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 2,198 GWhy-1 power could be generated and 677 Mm3y-1 of water supplied to irrigation schemes. However, the mean annual water level of the lake would be lowered by 0.44 meters with a consequent decrease in the average surface area of the lake of 30 km2. As well as adverse ecological impacts this would have significant implications for shipping and the livelihoods of many local people.
6 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.
7 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.
8 McCartney, Matthew. 2009. Improved planning of large dam operation: using decision support systems to optimize livelihood benefits, safeguard health and protect the environment. CPWF project report, project number 36. Project completion report submitted to the CGIAR Challenge Program on Water and Food (CPWF) Secretariat, December, 2009. 77p.
Dams ; Planning ; Operations ; Decision making ; Stakeholders ; Decision support tools ; Environmental impact assessment ; Social impact ; Environmental flows ; Malaria ; Mosquitoes ; Case studies ; Surveys ; Public health ; Farmers ; Irrigation schemes / Africa / Ethiopia / Nile River Basin / Lake Tana / Chara Chara Weir / Koga Dam
(Location: IWMI HQ Record No: H042678)
http://www.dfid.gov.uk/r4d/PDF/Outputs/WaterfoodCP/PN36_IWMI_ProjectReport_Dec09.pdf
https://vlibrary.iwmi.org/pdf/H042678.pdf
https://vlibrary.iwmi.org/pdf/H042678.pdf
(1.44 MB)
This project was undertaken with the aim of providing information to assist policy-makers, water resource managers and other interested stakeholders in the planning and management of large dams in Africa. The project highlighted the importance of considering environmental and social (including health) issues in dam planning and operation and illustrated how contemporary Decision Support Systems can be used to assist decision making processes. Key project findings relate to: i) the importance of stakeholder involvement in decision-making and how to enhance it; ii) the effectiveness of EIA follow-up; iii) the malaria implications of large dam construction; iv) the simulation of environmental impacts of large dam development and v) estimates of environmental flows. Guidelines on the use of DSS for key aspects of dam planning and operation have been developed.
This project was a collaboration of three institutions: Addis-Ababa University, Addis Ababa, Ethiopia; Southern Waters, Cape Town, South Africa; International Water Management Institute (IWMI), Regional office for the Nile Basin and East Africa, Addis Ababa, Ethiopia.
This project was a collaboration of three institutions: Addis-Ababa University, Addis Ababa, Ethiopia; Southern Waters, Cape Town, South Africa; International Water Management Institute (IWMI), Regional office for the Nile Basin and East Africa, Addis Ababa, Ethiopia.
9 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.
10 Abtew, W.; Melesse, A. M. (Eds.) 2008. 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. 368p. + 1CD.
Water resources ; Water management ; Hydrology ; Ecology ; River basin management ; Lakes ; Climate change ; International waters ; Water security ; Land use ; Environmental flows ; Downstream ; Weirs ; Simulation models ; Water balance ; Water use ; Water availability ; Watersheds ; Water productivity ; Water policy ; Erosion ; Sedimentation ; Rain ; GIS ; Remote sensing ; Evaporation ; Water power ; Investment ; Irrigation schemes ; Flooding ; Risks / Africa / Ethiopia / Kenya / Tanzania / Nile River Basin / Mara River / Lake Victoria Catchment / Gilgel Abbay Catchment / Lake Tana Basin / Chara Chara Weir / Rift Valley Lakes / Fogera Woreda / Geray Irrigation scheme / West Gojjam Zone / Amhara Region
(Location: IWMI HQ Call no: 551.48 G136 ABT Record No: H044302)
(0.46 MB)
11 Abtew, W.; Melesse, A. M. (Eds.) 2008. 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. 368p. + 1CD.
Water resources ; Water management ; Hydrology ; Ecology ; River basin management ; Lakes ; Climate change ; International waters ; Water security ; Land use ; Environmental flows ; Downstream ; Weirs ; Simulation models ; Water balance ; Water use ; Water availability ; Watersheds ; Water productivity ; Water policy ; Erosion ; Sedimentation ; Rain ; GIS ; Remote sensing ; Evaporation ; Water power ; Investment ; Irrigation schemes ; Flooding ; Risks / Africa / Ethiopia / Kenya / Tanzania / Nile River Basin / Mara River / Lake Victoria Catchment / Gilgel Abbay Catchment / Lake Tana Basin / Chara Chara Weir / Rift Valley Lakes / Fogera Woreda / Geray Irrigation scheme / West Gojjam Zone / Amhara Region
(Location: IWMI HQ Call no: 551.48 G136 ABT c2 Record No: H044337)
Powered by DB/Text WebPublisher, from
