Your search found 3 records
1 Goshime, D. W.; Absi, R.; Haile, Alemseged Tamiru; Ledesert, B.; Rientjes, T. 2020. Bias-corrected CHIRP [Climate Hazards Group InfraRed Precipitation] satellite rainfall for water level simulation, Lake Ziway, Ethiopia. Journal of Hydrologic Engineering, 25(9):05020024. [doi: https://doi.org/10.1061/(ASCE)HE.1943-5584.0001965]
Lakes ; Water levels ; Simulation ; Water balance ; Estimation ; Rainfall-runoff relationships ; Rivers ; Flow discharge ; Models ; Rain gauges ; Precipitation ; Catchment areas ; Evapotranspiration / Ethiopia / Lake Ziway / Meki Catchment / Katar Catchment
(Location: IWMI HQ Call no: e-copy only Record No: H049933)
(2.50 MB)
Applicability of satellite rainfall products must be explored since rain gauge networks have limitations to provide adequate spatial coverage. In this study, Climate Hazards InfraRed Precipitation (CHIRP) satellite-only product was evaluated for rainfall-runoff modeling whereas the simulated runoff served as input to simulate the water levels of Lake Ziway from 1986 to 2014. CHIRP dataset was bias-corrected using power transformation and used as input to Hydrologiska Byråns Vattenbalansavdelning (HBV) model to simulate streamflow of Meki and Katar catchments. Results showed that gauged catchments of Meki and Katar contributed 524 and 855 mm to the annual lake inflow, respectively. The estimated runoff from ungauged catchments is 182 mm that amounts to approximately 8.5% of the total lake inflow over the period 1986–2000. The results of lake level simulation show good agreement from 1986 to 2000, but deteriorating agreement after 2000, which is mainly attributed to errors in water balance terms and human-induced impacts. For the period 1986–2000, the water balance closure error for the lake was 67.5 mm per year, which accounts for 2.9% of the total lake inflow from rainfall and river inflow. This study shows bias correction increases the applicability of CHIRP satellite product for lake water balance studies.
2 Goshime, D. W.; Haile, Alemseged Tamiru; Absi, R.; Ledesert, B.. 2021. Impact of water resource development plan on water abstraction and water balance of Lake Ziway, Ethiopia. Sustainable Water Resources Management, 7(3):36. [doi: https://doi.org/10.1007/s40899-021-00516-w]
Water resources development ; Development plans ; Water extraction ; Water balance ; Lakes ; Irrigation schemes ; Water use ; Estimation ; Datasets / Ethiopia / Lake Ziway
(Location: IWMI HQ Call no: e-copy only Record No: H050725)
(2.08 MB)
Lake Ziway is providing water for a wide variety of sectors in the central rift valley of Ethiopia. However, there is a lack of systematic study that informs the effect of water abstraction on the lake water balance. In the present study, we conducted a Water Abstraction Survey (WAS) to estimate actual water withdrawal from the lake and developed a water balance model of the lake to evaluate the associated impact on the lake water storage and outflow for three development plans. The mean error and root mean square error of the simulated lake water level as compared with observed counterparts were estimated as 0.1 and 0.2 m, respectively, which is smaller than the range of the observed fluctuation of the lake water level under natural condition. Our findings indicate that the actual storage and outflow of Lake Ziway are significantly impacted by the existing water withdrawal. When the future development plans are fully implemented, the annual amount of irrigation and domestic water withdrawal from the lake will reach 95 Mm3 . This will cause the lake water level to drop by 0.94 m, which translates to 38 km2 reductions in the lake surface area. Consequently, the lake will lose 26.5% of its actual storage volume when the future development plan (2029–2038) is implemented as compared to the observed storage between 1986 and 2000. Hence, the current impact of water resources development around the lake is substantially large and will exacerbate in the future. This indicates the need for urgent actions to monitor and manage water abstraction from the lake.
3 Goshime, D. W.; Haile, Alemseged Tamiru; Rientjes, T.; Absi, R.; Ledesert, B.; Siegfried, T. 2021. Implications of water abstraction on the interconnected Central Rift Valley Lakes Sub-Basin of Ethiopia using WEAP. Journal of Hydrology: Regional Studies, 38:100969. [doi: https://doi.org/10.1016/j.ejrh.2021.100969]
Water extraction ; Water demand ; Water supply ; Water resources development ; Lakes ; Catchment areas ; Stream flow ; Water balance ; Environmental flows ; Models / Ethiopia / Central Rift Valley Lakes Sub-Basin
(Location: IWMI HQ Call no: e-copy only Record No: H050844)
https://www.sciencedirect.com/science/article/pii/S2214581821001981/pdfft?md5=840d781070bf0befcda70ba6e2881493&pid=1-s2.0-S2214581821001981-main.pdf
https://vlibrary.iwmi.org/pdf/H050844.pdf
https://vlibrary.iwmi.org/pdf/H050844.pdf
(5.31 MB) (5.31 MB)
Study region: Central Rift Valley Lakes sub-basin, Ethiopia.
Study focus: The competition for water is rapidly increasing in Central Rift Valley lakes sub-basin due to the combined effect of various water resources developments. However, the impacts of recent and future water resources development pathways on the water balance of the three interconnected lakes (i.e. Lake Ziway, Langano and Abiyata) are unknown. The Water Evaluation And Planning (WEAP) model was used to assess the development impacts on water resources of the interconnected lakes. We considered three development pathways that are, recent (2009–2018), short-term (2019–2028) and long-term development (2029–2038). Lake Ziway water inflows from six catchments were estimated using the Hydrologiska Byråns Vattenbalansavdelning (HBV) rainfall-runoff model. Crop water requirements for irrigation schemes were estimated by the CROPWAT model.
New hydrological insights for the region: WEAP simulations show a total water demand of 102.3 Mm3 under the recent development pathway that increases by 46% and 118% for short-term and long-term development pathways, respectively. This will notably affect the water balance of the interconnected lakes and cause an unmet water demand of 47.9 Mm3 for the long-term (2028–2038). For Lake Ziway and Abiyata, water levels will decrease substantially to cause water scarcity in the long-term, and developments in Lake Ziway will significantly affect water storage in Lake Abiyata storages in Lake Abiyata. Overall, future developments will threaten the water resource of the interconnected lake system.
Study focus: The competition for water is rapidly increasing in Central Rift Valley lakes sub-basin due to the combined effect of various water resources developments. However, the impacts of recent and future water resources development pathways on the water balance of the three interconnected lakes (i.e. Lake Ziway, Langano and Abiyata) are unknown. The Water Evaluation And Planning (WEAP) model was used to assess the development impacts on water resources of the interconnected lakes. We considered three development pathways that are, recent (2009–2018), short-term (2019–2028) and long-term development (2029–2038). Lake Ziway water inflows from six catchments were estimated using the Hydrologiska Byråns Vattenbalansavdelning (HBV) rainfall-runoff model. Crop water requirements for irrigation schemes were estimated by the CROPWAT model.
New hydrological insights for the region: WEAP simulations show a total water demand of 102.3 Mm3 under the recent development pathway that increases by 46% and 118% for short-term and long-term development pathways, respectively. This will notably affect the water balance of the interconnected lakes and cause an unmet water demand of 47.9 Mm3 for the long-term (2028–2038). For Lake Ziway and Abiyata, water levels will decrease substantially to cause water scarcity in the long-term, and developments in Lake Ziway will significantly affect water storage in Lake Abiyata storages in Lake Abiyata. Overall, future developments will threaten the water resource of the interconnected lake system.
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