Statistical Analysis and Flood Frequency Analysis for Conceiving Flood Management Options in the Volta Basin (Case of Nakambe River Sub-Basin in Burkina Faso)

Abstract

The advent of climate change raises many questions about the evolution of climatic conditions and their impact on the hydrological regime of rivers. In order to evaluate the different significant variations in temperature, rainfall or stream flow in recent years, statistical tests can detect breaks in the series or linear trends (increase or decrease). This study presents an application of these tests and their conditions of use on the flow data series of four hydrometric stations in the Bagré basin in Burkina faso, obtained from the General Directorate of Water Resources (DGRE) of Ouagadougou. Otherwise the study examined the pattern of flow data based on an Annual Serie Maximum (ASM) method in the basin, estimated and predicted flood return periods and the associated magnitude of river flow. In the light of this study, significant evolutions or breaks are highlighted, the method does not make it possible to determine their causes and to attribute them a climatic or anthropic origin for example.