Steady flow simulation in Anambe river basin using HEC-RAS

In many developing countries, food safety became a top priority for authorities and water resources managers. It is directly related to human’s life and economic development. Due to this necessity, the government of Senegal has selected the valley of Anambe of 16000 ha, to develop irrigated agriculture through rice cultivation. Two dams (Niandouba and Confluent) have been built to reinforce water availability due to climate change and variability effect on the rainfall.  For a better management of this hydraulic system, the knowledge of flow dynamic is required. In this paper, we have used Hec-ras model to describe the hydraulic behavior of this system. The river reach selected, is located between the confluence dam and Kounkane threshold. From an image LANDSTAT of this area, we have divided the river reach into 24 cross sections perpendicular to flow direction and numbered from 1 to 24. ArcGIS software is used to extract bathymetry for each cross section. This allows creating the river geometry with Hec-ras. Four stream flows have successively fixed as upstream boundaries. For each stream flow, Hec-ras calculate the flow characteristics. The high and low flow characteristics areas have been located. The most of these flow parameters decreases from upstream to downstream.