Regionalization of mean annual flow for ungauged catchments in case of Abbay River Basin, Ethiopia
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ORIGINAL ARTICLE
Regionalization of mean annual flow for ungauged catchments in case of Abbay River Basin, Ethiopia Habtamu Nega1,2 · Yilma Seleshi1 Received: 15 August 2020 / Accepted: 17 October 2020 © Springer Nature Switzerland AG 2020
Abstract Streamflow measurement is one of the features of Ethiopia and other developing countries suffer to estimate. Climate variable (rainfall) and physiographic variables (catchment area, land slope, and elevation) were selected to develop a regression model equation that can be used to estimate the mean annual flow for ungauged catchments in the Abbay river basin. 70% of 27 hydrometric stations were used to train the regression model, and the remaining 30% were used for validation. Furthermore, statistical tests were used for selecting the best trustworthy model. The result shows that both catchment area (A) as the only predictor with both coefficients of determination (R2) and Nash–Sutcliffe efficiency (NSE) value of 0.93 and catchment area (A), mean annual rainfall (MAR), and the average elevation (AE) as predictors with both coefficients of determination (R2) and Nash–Sutcliffe efficiency (NSE) value of 0.96 regression equations were the trustworthy models. Moreover, the validation analysis was performed for nine stations distributed in the study area and resulting from a statistical test and graphical visualization the second regression model equation was a trustworthy model. The model parameters (catchment characteristics) are easily accessible for practitioners that want to estimate the mean annual flow in the study area. Keywords Mean annual flow · Regionalization · Regression analysis · Ungauged catchments
Introduction One of the world’s most important and vital natural resources is water (Zigaf and Eriksson 2018) Water is one of human being’s basic need that has its involvement in dayto-day activities all over the world. Water resource planning and projects have been implemented for centuries to accomplish the need of the people in the way of electric power generation, domestic water use, irrigation, recreation, as well as transportation. Moreover, the water resource in the world is its effort on life and the existence of wildlife and ecosystem. Eventually, water has a huge devastating effect * Habtamu Nega [email protected] Yilma Seleshi [email protected] 1
School of Civil and Environmental Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia
Department of Hydraulic and Water Resources Engineering, Faculty of Technology, Debre Tabor University, Debre Tabor, Ethiopia
2
that may damage property and the loss of the irreplaceable life of humans by flood, drought, and waves in the oceans. This usefulness and consequence of water in the world to some degree are controlled by the design and management of different water resource schemes. The design and management of hydraulic structures are done by the help of hydrometeorological gauges which record different hydrological information in the basins such a
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