Your search found 11 records
1 Ahmed, A. A.. (Ed.) 1989. Proceedings of the Conference on Irrigation Management in the Gezira Scheme, Wad Medani, 15-17 May 1989. Wad Medani, Sudan: Hydraulic Research Station. xviii, 425p.
(Location: IWMI-HQ Call no: 631.7.8 G146 AHM Record No: H09109)
2 Ahmed, A. A.; Ahmed, S. E. 1993. Irrigation and drainage systems management in the Sudan. In ICID, 15th International Congress on Irrigation and Drainage, The Hague, The Netherlands, 1993: Water management in the next century. Transactions: Vol.1-B, Question 44, R36-R72: Planning and design of irrigation and drainage systems. New Delhi, India: ICID. pp.871-884.
Irrigation management ; Irrigation canals ; Drainage ; Design ; Aquatic weeds ; Sedimentation ; Water control ; Irrigation programs ; Irrigation operation ; Maintenance / Sudan
(Location: IWMI-HQ Call no: ICID 631.7 G000 ICI Record No: H015252)
3 Eldaw, A. K.; Ahmed, A. A.. 2004. Evolution of water management in irrigation systems: Sudan experience and future perspective. In Jordan. Ministry of Water and Irrigation. Bridging the gap – International Water Demand Management Conference, Dead Sea, Jordan, 30 May – 3 June 2004. Jordan: Ministry of Water and Irrigation.
Irrigation operation ; Maintenance ; Financing ; Groundwater ; Rain ; Water use ; Farmer participation / Sudan / Gezira Scheme
(Location: IWMI-HQ Call no: CD Col Record No: H037111)
4 Awulachew, Seleshi Bekele; McCartney, Matthew; Steenhuis, T. S.; Ahmed, A. A.. 2008. A review of hydrology, sediment and water resource use in the Blue Nile Basin. Colombo, Sri Lanka: International Water Management Institute (IWMI). 81p. (IWMI Working Paper 131) [doi: https://doi.org/10.3910/2009.312]
River basin management ; Erosion ; Sedimentation ; Reservoirs ; Hydrology ; Flow ; Models ; Water use ; Water demand ; Water supply ; Climate ; Rain ; Evapotranspiration ; Irrigation programs ; Water power / Africa / Sudan / Ethiopia / Blue Nile Basin
(Location: IWMI HQ Call no: IWMI 551.483 G100 AWU Record No: H041833)
(1 MB)
This working paper has been prepared as one of the outputs of the 'Improved water and land management in the Ethiopian Highlands and its impact on downstream stakeholders dependent on the Blue Nile' project, supported by the CGIAR Challenge Program on Water and Food (CPWF). It provides a comprehensive literature review; identifies types, sources and provides geo-referencing of data in the basin; compiles information of hydrology, sediment, and water resources and its uses. It also provides a review of applicable models for watershed and water allocation simulation, research methods, past studies and published material related to the Blue Nile. Extensive reference material and previous studies are compiled.
5 Ibrahim, Y. A.; Elnil, M. S. R.; Ahmed, A. A.. 2009. Improving water management practices in the Rahad Scheme. 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.50-69.
Irrigation Schemes ; Performance indexes ; Irrigation efficiency ; Canals ; Pumping / Sudan / Rahad Irrigation Scheme / Mena Pump Station / Blue Nile River
(Location: IWMI HQ Call no: IWMI 333.9162 G100 AWU Record No: H042507)
(0.63 MB)
This study aims to investigate and develop proper operational water management tools for the Rahad irrigation scheme. The Rahad project is considered as being among one of the schemes that could have a huge potential for expansion in the near future after the heightening of the Roseires Dam. The water supply sources for the Rahad scheme are the Blue Nile River and the Rahad seasonal river. The study explores options of augmenting the supply from the Rahad River during the wet season with the goal of minimizing sedimentation problems on the supply canals, reducing operation and maintenance costs associated with the Mena pumping station. Crop water requirements for the Rahad scheme were computed based on the historical cultivated areas of the different crops for the period 2000-2004. The Water Delivery Performance (WDP) Indicator for the scheme was evaluated. Frequency analysis and flow duration curves for the historical records of the Rahad seasonal stream were conducted in order to establish the yield of the Rahad River at different assurance levels. It is found that the yield from the Rahad seasonal river with 90% assurance level could be adequate to maintain an optimum performance of the irrigation system. Such proposed water management tools would improve the WDP by more than 25%. The dependence on the Rahad River during the wet season to meet the project irrigation water demands is anticipated to significantly minimize the maintenance and operation cost of diverting water from the Blue Nile.
6 Steenhuis, T. S.; Taylor, J.; Easton, Z.; Collick, A.; van de Giesen, N.; Liebe, J.; Ahmed, A. A.; Andreini, Marc. 2009. Rainfall-discharge relationships for monsoonal climates. 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.141-151.
Runoff ; Water balance ; Models ; River basins / Africa / Ethiopia / Blue Nile River Basin / Abay Blue Nile basin / Volta Basin
(Location: IWMI HQ Call no: IWMI 333.9162 G100 AWU Record No: H042514)
(0.60 MB)
Methods for estimating runoff that have been developed for temperate climates may not be suitable for use in the monsoonal climates of Africa, where there is a distinct dry season during which soils dry out to a considerable depth. This has a distinct effect on runoff generation that is not captured by “the temperate climate” models. The scope of this tool is to develop a simple water balance method for predicting river discharge. Water balance models have been shown to better predict river discharge in regions with monsoonal climates than alternative methods based on the United States Department of Agriculture-Soil Conservation Service (USDA-SCS) curve number. The latter is an empirical-based model developed in the USA that does not apply to monsoonal climates with distinct dry and wet periods.
7 Steenhuis, T. S.; Collick, A. S.; Easton, Z. M.; Leggesse, E. S.; Bayabil, H. K.; White, E. D.; Awulachew, Seleshi Bekele; Adgo, E.; Ahmed, A. A.. 2009. Predicting discharge and sediment for the Abay (Blue Nile) with a simple model. Hydrological Processes, 23:3728-3737. [doi: https://doi.org/10.1002/hyp.7513]
Simulation models ; Forecasting ; Erosion ; Sedimentation ; Calibration ; Water balance ; Rainfall-runoff relationships ; River basins ; Climate / Ethiopia / Sudan / Egypt / Abay River / Blue Nile River
(Location: IWMI HQ Call no: e-copy only Record No: H042576)
(0.28 MB)
Models accurately representing the underlying hydrological processes and sediment dynamics in the Nile Basin are necessary for optimum use of water resources. Previous research in the Abay (Blue Nile) has indicated that direct runoff is generated either from saturated areas at the lower portions of the hillslopes or from areas of exposed bedrock. Thus, models that are based on infiltration excess processes are not appropriate. Furthermore, many of these same models are developed for temperate climates and might not be suitable for monsoonal climates with distinct dry periods in the Nile Basin. The objective of this study is to develop simple hydrology and erosion models using saturation excess runoff principles and interflow processes appropriate for a monsoonal climate and a mountainous landscape. We developed a hydrology model using a water balance approach by dividing the landscape into variable saturated areas, exposed rock and hillslopes. Water balance models have been shown to simulate river flows well at intervals of 5 days or longer when the main runoff mechanism is saturation excess. The hydrology model was developed and coupled with an erosion model using available precipitation and potential evaporation data and a minimum of calibration parameters. This model was applied to the Blue Nile. The model predicts direct runoff from saturated areas and impermeable areas (such as bedrock outcrops) and subsurface flow from the remainder of the hillslopes. The ratio of direct runoff to total flow is used to predict the sediment concentration by assuming that only the direct runoff is responsible for the sediment load in the stream. There is reasonable agreement between the model predictions and the 10-day observed discharge and sediment concentration at the gauging station on Blue Nile upstream of Rosaries Dam at the Ethiopia–Sudan border.
8 Easton, Z. M.; Fuka, D. R.; White, E. D.; Collick, A. S.; Ashagre, B. B.; McCartney, Matthew; Awulachew, Seleshi Bekele; Ahmed, A. A.; Steenhuis, T. S. 2010. A multi basin SWAT model analysis of runoff and sedimentation in the Blue Nile, Ethiopia. Hydrology and Earth System Sciences, 14(10):1827-1841. [doi: https://doi.org/10.5194/hess-14-1827-2010]
Simulation models ; Calibration ; Runoff ; Erosion ; River basins ; Sedimentation ; Watersheds / Ethiopia / Blue Nile River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H043234)
http://www.hydrol-earth-syst-sci.net/14/1827/2010/hess-14-1827-2010.pdf
https://vlibrary.iwmi.org/pdf/H043234.pdf
https://vlibrary.iwmi.org/pdf/H043234.pdf
(1.82 MB)
A multi basin analysis of runoff and erosion in the Blue Nile Basin, Ethiopia was conducted to elucidate sources of runoff and sediment. Erosion is arguably the most critical problem in the Blue Nile Basin, as it limits agricultural productivity in Ethiopia, degrades benthos in the Nile, and results in sedimentation of dams in downstream countries. A modified version of the Soil and Water Assessment Tool (SWAT) model was developed to predict runoff and sediment losses from the Ethiopian Blue Nile Basin. The model simulates saturation excess runoff from the landscape using a simple daily water balance coupled to a topographic wetness index in ways that are consistent with observed runoff processes in the basin. The spatial distribution of landscape erosion is thus simulated more correctly. The model was parameterized in a nested design for flow at eight and sediment at three locations in the basin. Subbasins ranged in size from 1.3 to 174 000 km2, and interestingly, the partitioning of runoff and infiltrating flow could be predicted by topographic information. Model predictions showed reasonable accuracy (Nash Sutcliffe Efficiencies ranged from 0.53–0.92) with measured data across all sites except Kessie, where the water budget could not be closed; however, the timing of flow was well captured. Runoff losses increased with rainfall during the monsoonal season and were greatest from areas with shallow soils and large contributing areas. Analysis of model results indicate that upland landscape erosion dominated sediment delivery to the main stem of the Blue Nile in the early part of the growing season when tillage occurs and before the soil was wetted up and plant cover was established. Once plant cover was established in mid August landscape erosion was negligible and sediment export was ominated by channel processes and re-suspension of landscape sediment deposited early in the growing season. These results imply that targeting small areas of the landscape where runoff is produced can be the most effective at controlling erosion and protecting water resources. However, it is not clear what can be done to manage channel erosion, particularly in first order streams in the basin.
9 Steenhuis, T. S.; Collick, A. S.; Awulachew, Seleshi B.; Adgo, E.; Ahmed, A. A.; Easton, Z. M. 2008. Modelling erosion and sedimentation in the Upper Blue Nile. 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.200-212.
Erosion ; Sedimentation ; Simulation models ; Rainfall-runoff relationships ; Rivers ; Flow discharge / Ethiopia / Upper Blue Nile / Abay Blue Nile
(Location: IWMI HQ Call no: 551.48 G136 ABT Record No: H044323)
(0.82 MB)
10 Steenhuis, T. S.; Easton, Z. M.; Awulachew, Seleshi Bekele; Ahmed, A. A.; Bashar, K. E.; Adgo, E.; Selassie, Y. G.; Tilahun, S. A. 2012. The Nile Basin sediment loss and degradation, with emphasis on the Blue Nile. 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.112-132.
River basins ; Sedimentation ; Sediment pollution ; Runoff ; Highlands ; Gully erosion ; Simulation models ; Reservoirs ; Watersheds ; Assessment ; Water balance ; Spatial distribution / Africa / Nile River Basin / Blue Nile River Basin
(Location: IWMI HQ Call no: IWMI Record No: H045314)
(1.40MB)
11 Haileslassie, A.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Peden D.; Ahmed, A. A.; Gebreselassie, S.; Tafesse, T.; Mapedza, Everisto; Mukherji, Aditi. 2012. Institutions and policy in the Blue Nile Basin: understanding challenges and opportunities for improved land and water management. 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.253-268.
River basins ; Water management ; Land management ; Institutions ; Organizations ; Water policy ; Land policy ; Upstream ; Downstream ; Economic aspects / Africa / Blue Nile River Basin
(Location: IWMI HQ Call no: IWMI Record No: H045320)
(1.07MB)
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