Numerical simulation of water demand in the Lobo watershed in the context of climate change (Central-West Côte d'Ivoire)

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Yao Affouted Berthe

Jean Lorougnon Gueda University, Côte d'Ivoire

: J Hydrogeol Hydrol Eng

Abstract

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The decline in rainfall in recent decades and the resulting decrease in surface water supplies have penalized many waterrelated development projects in the Lobo watershed. Due to the increased demand for water in this basin, there is now a problem of adequacy between available resources and current needs. The study was conducted using the Water Assessment and Planning (WEAP) model, which integrates several dimensions: Between water requirements and water supplies and between quantity and quality. Two scenarios were analyzed in this study: The possible increase in the population growth rate and the impact of hydraulic and hydro-agricultural developments on the dynamics of the basin. The results obtained indicate that the basin's water requirements amount to 45.67 million m3 in 2010. The annual supply deficit is 30.97 million m3. The total demand for the basin is 32.2%. This rate is not due to a shortage of resources but to a critical lack of hydraulic works. By 2025, estimates of the evolution of water demand for all uses in the basin forecast a 103.6% increase in the high population growth scenario. If the envisaged development strategies are implemented, the water supply from dam reinforcement with an annual flow of 15 million m3 will increase the coverage from 32.2% to 75%.

Biography

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