Your search found 3 records
1 Alaminie, A.; Amarnath, Giriraj; Padhee, Suman; Ghosh, Surajit; Tilahun, S.; Mekonnen, M.; Assefa, G.; Seid, Abdulkarim; Zimale, F.; Jury, M. 2023. Application of advanced Wflow_sbm Model with the CMIP6 climate projection for flood prediction in the data-scarce: Lake-Tana Basin, Ethiopia [Abstract only]. Paper presented at the European Geosciences Union (EGU) General Assembly 2023, Vienna, Austria and Online, 24-28 April 2023. 1p. [doi: https://doi.org/10.5194/egusphere-egu23-1113]
Flood forecasting ; Climate change ; Hydrological modelling ; Climate models / Ethiopia / Lake Tana Basin
(Location: IWMI HQ Call no: e-copy only Record No: H051891)
https://meetingorganizer.copernicus.org/EGU23/EGU23-1113.html?pdf
https://vlibrary.iwmi.org/pdf/H051891.pdf
https://vlibrary.iwmi.org/pdf/H051891.pdf
(0.28 MB) (289 KB)
2 Gari, Y.; Block, P.; Steenhuis, T. S.; Mekonnen, M.; Assefa, G.; Ephrem, A. K.; Bayissa, Y.; Tilahun, Seifu A. 2023. Developing an approach for equitable and reasonable utilization of international rivers: the Nile River. Water, 15(24):4312. (Special issue: Adaptive Water Resources Management in an Era of Changing Climatic, Environmental and Social Conditions) [doi: https://doi.org/10.3390/w15244312]
(Location: IWMI HQ Call no: e-copy only Record No: H052561)
https://www.mdpi.com/2073-4441/15/24/4312/pdf?version=1702957721
https://vlibrary.iwmi.org/pdf/H052561.pdf
https://vlibrary.iwmi.org/pdf/H052561.pdf
(11.30 MB) (11.3 MB)
The absence of a basin-wide apportionment agreement on using the Nile River equitably has been a long-standing source of disagreement among Nile riparian states. This study introduces a new approach that the riparian states can consider that quantifies the Nile River’s apportionment. The approach includes (1) developing a basin-wide database of indicators representative of the United Nations Watercourse Convention (UNWC) relevant factors and circumstances, (2) developing an ensemble of indicator weighting scenarios using various weighting methods, and (3) developing six water-sharing methods to obtain a range of apportionments for Egypt, Sudan, Ethiopia and the group of the White Nile Equatorial States for each weighting scenarios. The results illustrate a relatively narrow range of country-level water apportionments, even though some individual factor weights vary from 3% to 26%. Considering the entire Nile River, the water apportionment for Ethiopia ranges from 32% to 38%, Sudan and South Sudan from 25% to 33%, Egypt from 26% to 35%, and the Equatorial States from 5% to 7%. We trust that the six proposed equitable water-sharing methods may aid in fostering basin-wide negotiations toward a mutual agreement and address the dispute over water sharing.
3 Sishu, F. K.; Tilahun, S. A.; Schmitter, Petra; Assefa, G.; Steenhuis, T. S. 2022. Pesticide contamination of surface and groundwater in an Ethiopian highlands’ watershed. Water, 14(21):3446. [doi: https://doi.org/10.3390/w14213446]
Pesticides ; Chemical contamination ; Surface water ; Groundwater ; Water pollution ; Highlands ; Watersheds ; Lakes ; Ecotoxicity ; Aquatic organisms ; Fish ; Human health ; Risk assessment ; Farmers / Africa South of Sahara / Ethiopia / Lake Tana Basin / Robit Bata Watershed
(Location: IWMI HQ Call no: e-copy only Record No: H052844)
https://www.mdpi.com/2073-4441/14/21/3446/pdf?version=1667996326
https://vlibrary.iwmi.org/pdf/H052844.pdf
https://vlibrary.iwmi.org/pdf/H052844.pdf
(4.12 MB) (4.12 MB)
Agricultural intensification in sub-Saharan African countries has significantly increased pesticide applications. Information on pesticide residues and their transport in groundwater and streams is needed to properly manage and reduce any harm to the ecosystem and environment. This information is lacking in the volcanic soils of Ethiopian highlands. Therefore, this study was conducted to assess pesticide concentrations in ground and surface water and their risk to humans and aquatic life. The 9 km2 rural watershed Robit Bata in the Lake Tana Basin was selected. Crops were grown under rainfed and irrigated conditions. Pesticide use was assessed, and groundwater samples were collected from eight wells and surface water samples at the outlet twice in the rain phase and once in the dry phase. Samples were analyzed for chlorpyrifos, dimethoate, (a and ß) endosulfan, profenofos, NO- 3 , and pH. Chlorpyrifos and endosulfan, which are strongly adsorbed and slowly degrading pesticides, were found in nearly all surface and groundwater samples, with maximum concentrations in surface water of 8 µg L-1 for chlorpyrifos and 3 µg L-1 endosulfan. Maximum groundwater concentrations were only slightly lower. The weakly adsorbed and fast degrading pesticides, dimethoate, and profenofos were detected only in the rain phase after spraying in the groundwater, indicating preferential transport to groundwater at depths of up to 9 m. The average concentration was 0.38 µg L-1 for dimethoate in surface waters and 1.24 µg L-1 in groundwater. Profenofos was not detected in surface water. In the groundwater, the average concentration was 0.05 µg L-1 . Surface water concentrations of chlorpyrifos and endosulfan were highly toxic to fish. The World Health Organization banned these pesticides worldwide. It should be phased out for use in Ethiopia to safeguard the ecological health of Lake Tana, which is rich in biodiversity and endemic fish species.
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