Research Article
Evaluation and Update of Two Regional Methods (ORSTOM and CIEH) for Estimations of Flow Used in Structural Design in West Africa
@INPROCEEDINGS{10.1007/978-3-319-98878-8_15, author={Sehouevi Agoungbome and Ousmane Seidou and Moussa Thiam}, title={Evaluation and Update of Two Regional Methods (ORSTOM and CIEH) for Estimations of Flow Used in Structural Design in West Africa}, proceedings={Innovations and Interdisciplinary Solutions for Underserved Areas. Second International Conference, InterSol 2018, Kigali, Rwanda, March 24--25, 2018, Proceedings}, proceedings_a={INTERSOL}, year={2018}, month={9}, keywords={Design flow Watershed Log linear regionalization}, doi={10.1007/978-3-319-98878-8_15} }- Sehouevi Agoungbome
Ousmane Seidou
Moussa Thiam
Year: 2018
Evaluation and Update of Two Regional Methods (ORSTOM and CIEH) for Estimations of Flow Used in Structural Design in West Africa
INTERSOL
Springer
DOI: 10.1007/978-3-319-98878-8_15
Abstract
The ORSTOM and CIEH methods are the most popular methods used in West Africa to estimate the design flow, needed in the design of hydraulic structures. However, these methods, based on hydrological data collected before 1965 and 1983 for ORSTOM and CIEH respectively, showed some shortcomings and deviations in the estimation of the forecasts. This study, therefore, assesses the design flow on data collected from some watersheds in Benin and Niger using a frequency analysis. These estimations are therefore compared with estimations obtained using the ORSTOM and CIEH methods on the same watersheds. As result, we observe an important under-estimation of the flows with the ORSTOM method, whereas the CIEH method gives higher values. The use of the log linear regionalization method, considering the area of the watershed basin and the global slope index, gives very interesting results and good perspectives of estimation on few or no data watersheds basins.