Ethiopian Journal of Water Science and Technology最新文献

{"title":"Implications of uncontrolled water withdrawal and climate change on the water supply and demand gap in the Lake Tana sub-basin","authors":"Mintamer Ferede, A. Haile, Assefa Gedle, Alemshet Kebede, Selamawit Damtew Amare, M. Taye","doi":"10.59122/15519a9","DOIUrl":"https://doi.org/10.59122/15519a9","url":null,"abstract":"This study evaluates the implications of multiple climatic and non-climatic factors on the water resource of the Lake Tana sub-basin, Ethiopia. The study focuses on three drivers: land use change, irrigation expansion, and climate change (CC), and their impact on the current and future water availability across the sub-basin. The study uses a random forest (RF) machine learning classifier in the Google Earth Engine (GEE) platform to detect land use land cover change (LULC) and for mapping the actual irrigated-area. The Climate Hazards Group InfraRed Precipitation and temperature data were used with station data to evaluate the implication of CC on the water availability of Lake Tana sub-basin. The supply-demand relationship was done for Gumara catchment within Tana sub-basin as an experimental site. Based on the LULC analysis, plantation, cropland, bare lands, built-up, and wetland showed an increasing trend, while forest, bush land, and grassland showed a decreasing trend. The increasing rate of crop land in the expense of natural forest, shrub land, grassland may cause runoff/flood, high soil erosion, and lower rate of groundwater recharge. The actual irrigated area mapping analysis shows a widespread irrigation near the Lake Shore and upstream parts of the sub-basin. The climate change analysis shows an increasing trend of potential evapotranspiration during the irrigation period attributed to increase in maximum temperature. The rising of potential evapotranspiration during the irrigation period creates a water shortage in the study and future periods as the crops need more water for growth. The estimated stream flow for Gumara catchment shows an increasing trend for the future period. The supply-demand relationship of the catchment shows an uneven distribution of water in the Gumara catchment both in the current and future periods resulting in unbalance abstraction of irrigation water. The study reveals that climate change, land cover change, and uncontrolled expansion of irrigated land area are likely to increase the unmet demand by increasing irrigation water demand, and this can cause conflict of interest between the users. Therefore, sustainable water resource management practices such as land management practices, and adaptive management of irrigation should be applicable to prevent or reduce the occurrence of conflict over the water demand.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"51 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139597863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Hydrometeorological Characteristics in the Northern Ethiopia, Gerado Catchment","authors":"A. Nigusse, AbdulAziz Hussien, Destalem Niguse, Equbay Gebre, Gebrerufael Hailu, Tesfalem Gebre, Desta Leuel, Abrhaley Teklay","doi":"10.59122/1551910","DOIUrl":"https://doi.org/10.59122/1551910","url":null,"abstract":"In Northern Ethiopia, land degradation, together with population pressure foster soil erosion. Soil erosion in turn escalates surface runoff which is a serious challenge to agricultural production and economic growth in the region. Understanding the characteristics and dynamics of hydrometeorological variables are important elements in water resources development projects. Present study was carried out to evaluate hydrometeorological characteristics in the Northern Ethiopia, Gerado Catchment. Long term meteorological data such as precipitation, temperature and other climatic factors were collected from existing meteorological stations. Thornthwaite empirical equation and thornthwaite soil water balance models were employed in estimating potential and actual evapotranspiration. The first approach used air temperature as an index of energy available for evapotranspiration. Similarly, groundwater recharge of the catchment was computed as a difference of between outflow and change in a water storage. The runoff of the area was calculated based on the rainfall coefficient, annual precipitation and aerial coverage. On the other hand, groundwater potential (GWP) of the area was mapped based on important selected controlling factors. The result indicated that the annual potential and actual evapotranspiration of the catchment was found to be 755 mm/year and 723 mm/year respectively. The actual evapotranspiration was evaluated and weighted based on the dominant soil textures, depth root soil, and the respective land uses. As result, high evapotranspiration was observed in moderate deep rooted cereal crops and sandy loam soil texture which accounted 48.5% influence. But, cereal crops with moderate deep rooted and clay loam type have low AET (42.2%). Because of absence of gauging stations in the catchment, the volume runoff was computed using the runoff coefficient method. Accordingly, surface runoff from the catchment was calculated to be 120,581,841 cubic meter (m3) or 326 mm. Whereas, the groundwater recharge of the area was also found to be 52,208,159.5 cubic meter (141.5mm). Thus, out of the given mean annual precipitation, 27.6% and 12% of the mean annual rainfall lost because of runoff and recharge and the rest (60.4%) due to evapotranspiration. Regarding GWP suitability mapping, lithology, liniment density and geomorphology were found the most essential factors affecting groundwater mapping. The suitable GWP areas were lied within lithology and geomorphology class. Moreover, areas with flat slope and low lineament density are also located in most rich groundwater areas. Furthermore, installation of rain gauges at appropriate areas are essential for all inclusive and consistent data availability.       \u0000Keywords: Hydro-meteorological, Gerdo Catchment, groundwater recharge, runoff, evapotranspiration, GWP","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"86 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139596642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Roadside PM2.5 concentrations measured with low-cost sensors and student science in Arba Minch, Ethiopia","authors":"Jan Dirk Dingemanse, M. Tadele, Tewodros Zerihun Tadesse","doi":"10.59122/15519k8","DOIUrl":"https://doi.org/10.59122/15519k8","url":null,"abstract":"Exposure to PM2.5 poses one of the biggest health threats, with traffic and biomass burning as dominant sources in urban areas of low-income countries. In Ethiopia, the combination of these two sources suggests a high roadside exposure. Because of a lack of resources for data collection, only few studies were conducted on roadside exposure in Ethiopia. Using low-cost sensors and student science could partially remedy this lack of resources. Students collected PM2.5 data in Arba Minch at four stationary locations and inside two public transport tricycles during a period of six weeks with self-made low-cost sensors. Data was analyzed to gain insight into concentration levels, temporal variation, spatial variation, and difference between next to the road and on-road concentrations. Average concentrations ranged from 13-36 µg/m3. Concentrations were highest during morning hours (42 ± 12 for hours 6:00-10:00, versus 20 ± 1 and 32 ± 4 for 10:00-17:00 and 17:00-21:00, respectively), and concentrations were highest at the local bus station (36.2 µg/m3). On-road concentrations showed the highest variation and were on average higher than concentrations next to the road (33 ± 25 and 30 ± 22 µg/m3 versus 23.3 ± 18 and 22.6 ± 18 µg/m3). On a daily average level, concentrations at different locations showed a high correlation (R2 0.8-0.95) amongst each other. This suggests the possibility to interpolate concentrations from one location to other locations. Moreover, the PM2.5 concentrations exceeded air quality guidelines. In Ethiopia, more than ten cities have higher populations and traffic flows than Arba Minch. In those cities, similar or higher exceedances are expected. With this study as an example, other universities could likewise conduct research with low-cost sensors and student science in their cities. Cooperation across course instructors and universities in applying these methods will increase the insight in PM2.5 exposure in Ethiopian cities. \u0000Keywords: ambient air pollution; traffic; Sensirion SPS30; student measurements; Particulate Matter","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"7 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139603125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydraulic and Utility Performance Evaluation of Ataye Town Water Distribution Network, Ethiopia: case for small towns in developing countries","authors":"Zewdu Shewafera, Kinfe Kassa","doi":"10.59122/15519g6","DOIUrl":"https://doi.org/10.59122/15519g6","url":null,"abstract":"Evaluating hydraulic and utility performance of water distribution network is a way to check the functionality degree of a system. Water CAD software was used in developing a model and evaluating the hydraulic performance of water distribution system of Ataye Town, Amhara Region, Ethiopia. Both steady state and extended period simulation analysis were carried out to determine hydraulic parameters (pressure and velocity). The model was calibrated using Darwin Calibrator and validity was checked by both correlation coefficient and scatter plot. The utility performance was also evaluated using international water association performance indicators. The simulated result for steady state analysis showed that 68.7% of the nodes operated within optimum adopted pressure (15-60 meter) and 93% of the distribution pipes had a velocity of <0.6 m/s which was a minimum adopted velocity. For extended period simulation 34.3% during maximum demand time and 16.8% during minimum consumption hours had pressure <15meters. 10.8% had negative pressure during maximum demand hours located at Sudan, Selama, and Zigba sefer and 14 nodes (8.4%) during low consumption time had a pressure greater than 60meter, which was a maximum adopted pressure. The areas of high pressure were located at around mosque, Worku Hotel and Hamus Gebaya. The distribution system performs within the adopted pressure at minimum demand time (74.7%) and maximum consumption hours (65.1%). 23.5% of the systems had a velocity of 0.6-2 m/s and the rest had a velocity less than 0.6m/s during high demand time. During low consumption hours, 100% of the system velocity was estimated to be <0.6m/s. Based on the IWA performance indicators, water utility of Ataye Town was evaluated and had low, technical, financial, personnel, and environmental performances. Finally, the distribution system was modified and optimized by providing alternative connections with pressure reducing valves and changing pipe diameter to improve the hydraulic performance and reduce system disruption of the Town. \u0000Keywords: Extended period simulation; Hydraulic performance; IWA Utility performance; Steady state analysis; Water CAD","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"42 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139603619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Grand Ethiopian Renaissance Dam (GERD): Geopolitical Implications","authors":"Gashaw Ayferam Endaylalu","doi":"10.59122/15519k7","DOIUrl":"https://doi.org/10.59122/15519k7","url":null,"abstract":"This study examined the geopolitical implications of the GERD project in light of the ‗framework of benefit-sharing‘. The study adopted a qualitative research approach in which data were gathered from multiple sources, such as key informant interviews, books, journal articles, policy briefs, commentary, and opinions; and documents such as declarations, agreements, letters, and statements, water policies, government communications, reports, and media sources. In light of this, the paper argues that GERD foreshadows a new emergent order based on principles of benefit-sharing capable of replacing the existing inequitable water-sharing regime. The GERD has the potential to create cooperation between the riparian countries because of its proven benefits to the region. The potential cost of non-cooperation may also push Egypt towards opting for cooperation. Furthermore, the GERD could shift the power dynamics by positioning Ethiopia as a regional anchor state, which could further enhance prospects for cooperation. The study also highlights that the conflict over the GERD extends beyond the physicality of the dam and is deeply rooted in the geopolitical rivalry between Ethiopia and Egypt. Egypt perceives the GERD as an existential threat to its existing water-sharing regime while Ethiopia regards it as a benefit-sharing project and an existential necessity. However, the study highlights the possibility that the GERD may transform the geopolitical rivalry between Ethiopia and Egypt from a water-based conflict into a power trade competition, implying that cooperation and conflict, competition and cooperation, may coexist in this complex geopolitical landscape. The study implies that understanding the geopolitical implications of the GERD is crucial for navigating the complexities of the issue and finding sustainable solutions. Keywords: Geopolitics, GERD, Benefit-sharing, Water-sharing, Ethiopia, Egypt, Nile","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"68 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139604100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Performance Evaluation of HEC-HMS and SWAT Models in Stream Flow Simulation: the Case of Bilate and Gidabo Watersheds, Ethiopia","authors":"Bereket Dora Doliso, Samuel Dagalo Hatiye","doi":"10.59122/xc8543210","DOIUrl":"https://doi.org/10.59122/xc8543210","url":null,"abstract":"Many hydrological models have been developed to simulate watershed hydrology. However, identifying the most cost-effective and efficient hydrological models for a specific watershed with reasonable certainty becomes difficult. The purpose of this study was to compare the stream flow prediction efficiency of the HEC-HMS and SWAT models, as well as the associated uncertainty, in the Bilate and Gidabo watersheds. Model-sensitive parameters being identified, they were calibrated and validated. The parameter uncertainties were analyzed using Markov Chain Monte Carlo (MCMC) for HEC-HMS and Sequential Uncertainty Fitting version two (SUF-2) for SWAT. In the case of the HEC-HMS model, the results showed that constant loss rate (CR) was the most sensitive parameter, followed by lag time (LT) for both watersheds. SWAT detected ALPHA_BF in the Bilate Watershed and CN_2 in the Gidabo Watershed as the most sensitive parameters. Overall, both models could adequately simulate the hydrology of both watersheds. Despite their similar modeling capabilities, a comparison analysis revealed that the HEC-HMS model outperformed the SWAT model in simulating streamflow in both watersheds. The findings of this study can help potential model users make risk-informed decisions by selecting a representative model and quantifying associated uncertainty in the modeling field.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133941430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Three Low-Cost Particulate Matter (PM2.5) Sensors for Ambient and High Exposure Conditions in Arba Minch, Ethiopia","authors":"Jan Dirk Dingemanse","doi":"10.59122/xec844310","DOIUrl":"https://doi.org/10.59122/xec844310","url":null,"abstract":"The burden of disease from ambient and indoor air pollution is highest in low-income countries, while their resources for monitoring air pollutants are the lowest. PM2.5 is the primary indicator of air pollution. Reference monitors of PM2.5 are expensive, but there is an increased use of low-cost sensors (LCS). Three LCS, the UCB-PATS+ (PATS), Airvisual Pro (IQAV) and Sensirion SPS30 (SPSA) are being used in Arba Minch, Ethiopia, but their quality has not yet been evaluated under circumstances common to low-income countries, and the variety of metrics used in evaluation studies make comparisons difficult. This study aims to evaluate the three LCS under circumstances encountered in Arba Minch, with metrics commonly used and officially prescribed. Measurements were conducted with the LCS at 2 ambient and 4 high exposure (kitchen) concentrations, and at four of those locations with the gravimetric reference method as well. The quality of the three LCS was evaluated within identical, with reference, and between different types, with commonly reported (regression slope and R2) and officially prescribed (Pearson correlation, bias, accuracy, expanded uncertainty) metrics. The SPSA has low within variation in both ambient and high-exposure situations, meets official requirements compared to the reference, and shows a stable bias across different time and concentration levels. The IQAV and PATS within variations are not up to official standards but show strong linear associations. The IQAVs as a group, and PATSs individually, meet official reference requirements at daily level. Between comparison reveals that all LCS show strong linear associations even at 10-minute average level. For SPSA the association is similar across all ranges, and for the others the association is strong when different ranges are taken into account. Generally, all LCS are a good alternative for expensive reference methods. The strong linear associations suggest the possibility of correcting LCS measurement data based on other studies’ results and based on other LCS, across different concentration ranges. Projects with a budget of $600 can already supply 10 measurement locations. Higher-budget projects can contribute to the quality of low-budget projects when they do not only use expensive monitors, but also LCS at the same location.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116617850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shallow Groundwater Quality and Human Health Risk Assessment in Holte, a Town in Southern Ethiopia","authors":"Demamu Haligamo, T. Aragaw","doi":"10.59122/1342309","DOIUrl":"https://doi.org/10.59122/1342309","url":null,"abstract":"Groundwater quality and human health risk assessment are critical for the long-term usage of household water supplies. The purpose of this study was to evaluate groundwater quality and human health risk in Holte, a town in the Derashe Special Woreda in southern Ethiopia. Water samples from seven shallow groundwater wells were taken and examined for hydrogeochemical properties. The Water Quality Index (WQI) was developed to assess the suitabilityof groundwater for drinking. Groundwater hydrochemistry types and evolutionary processes were investigated. The results suggested that the typical pH of groundwater samples had an average pH of 7.99. The values of electrical conductivity (EC), bicarbonate (HCO3) and total dissolved solid (TDS) in all samples were above the recommended upper limit of World Health Organization (WHO) for drinking water. Based on the hydrochemical findings, the orders of cationic abundance and anionic abundance in the groundwater were Ca²⁺ < Mg²⁺ < K⁺ < Na⁺ and F⁻ < SO₄²⁻ < Cl⁻< HCO₃⁻, respectively. According to the Piper Tri-linear Diagram, the majority of groundwater samples were found to have Mixed Ca-Na-HCO3. The Gibbs fields results showed that evaporation dominated groundwater quality, whereas chemical weathering of rock-forming minerals dominated the remaining samples. The calculated WQI result showed that 57.1% (4 handpumps) of groundwater samples from the town had acceptable water quality, but 42.9% (3 handpumps) had poor water quality. The finding of this study suggests that groundwater quality parameters should be tested and monitored on handpumps at sample locations 1, 2, and 3 in the town to minimize human health risks and ensure long-term socioeconomic development.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130657066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of deficit irrigation on Onion yield and water use efficiency: Concerning moisture stress areas of Arba Minch, Southern Ethiopia","authors":"G. Gelu, Markos Habtewold, Abebaw Bergene","doi":"10.59122/1351926","DOIUrl":"https://doi.org/10.59122/1351926","url":null,"abstract":"To cope with scarce water supply, deficit irrigation is an important tool to achieve the goal of reducing irrigation water use and increasing water use efficiency (WUE) under scarce water resources. This experiment was conducted for the last three years (2018-2020)in Chano Mille Kebelle near Arba Minch to examine the level of deficit irrigation which allows the maximum yield of onion, WUE and economic return without significantly reducing the yield of onion. Randomized Complete Block Design was used to run the experiment with four Replications. The experiment comprised different levels of deficit irrigation treatment: 100% of ETc, 85% of ETc, 75% of ETc and 50% of ETc. Analysis of variance showed that there was a significant difference among treatments in terms of marketable yield,total yield, and WUE in three consecutive years. 100% of ETc gave the maximum marketable and total yield and WUE which was followed by 85% of ETc. Additionally, the combined analysis of the mean showed that the highest marketable yield 24.97ton ha-1 and a total yield of 28.63 ton ha-1 was observed from100% of ETc and followed by 22.13 ton ha-1of marketable yield and 26.86 ton ha-1of total yield from 85% of Etc without significant variation. The highestcombined WUE of 4.445kg m-3 resulted from 50% of ETc compared to the other levels of deficit irrigation (3.12 kg m-3 , 3.02 kg m-3, 4.27 kg m-3) from 100%, 85% and 70%, respectively. Given economic return, 100% of ETc yielded the highest net benefit of 208008 Birr/ha and followed by 198558 Birr/ha observed from 85% of ETc without significant economic return. The minimum (123858 Birr/ha gained from 50% of ETc. Based on these findings, 85% of ETc of deficit irrigation under moisture stress areas of Arba Minch should be applied to save water, and increase economic return and command area.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130783576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility of hydropower generation on existing Legedadi water supply scheme, Addis Ababa-Ethiopia","authors":"Matusal Lamaro Lagebo, A. Mohammed","doi":"10.59122/1344ca7","DOIUrl":"https://doi.org/10.59122/1344ca7","url":null,"abstract":"Hydropower can be harnessed by installing in-pipe turbines with the reduced cost compared with hydropower dam construction. Legedadi Water Supply Scheme is found in Addis Ababa and is fed by gravity. This research assesses the hydropower potential of the existing large water transmission pipelines in line with their financial viability. The research required the collection of data from pipe flow (for 29 years from the system record) and pipe layout drawings believed to be useful for estimating the power. The available pipe layout drawing was processed to prepare a profile view with the help of AutoCAD CIVIL 3D. From the profile view, the gross heads and length of the pipelines were obtained. The exploitable power and financial viability of the projects were estimated by RET Screen software. The raw water main (DN1200) was discovered to have a head of 12.46 m and to convey up to 1.47 m3/s at 90% exceedance over a length of 550 m. The two treated water mains have a head of 19.15 m with a flow of 1.14 m3/s at 90 % exceedance via DN1200 and 0.29 m3/s at 90% exceedance via DN900 over a length of 18.4 km. The most suitable sites for the installation of turbines were at the inlet of the treatment plant and the Kotebe Terminal Reservoir. The Toshiba Hydro-eKIDS turbine was selected since it might work efficiently with large flow variation.The annual energy output from the raw water main to be obtained was 1,208 Mwh,with an estimated cost of $461,000 and an annual savings or revenue of $75,946. For the treated water mains, 1,193 Mwh (DN1200) and 344 Mwh (DN900) could be extracted with an estimated cost of 414,500$ (DN1200) and 135,900$ (DN900). The annual revenue for treated water mains is 75,068$ (DN1200) and that for DN900 is 18,842$.","PeriodicalId":156282,"journal":{"name":"Ethiopian Journal of Water Science and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}