Evaluation of the effectiveness of the concrete protection channel for the urban expansion area of the western part from the risk of flooding, the case of the city of M'sila - Algeria

The study aims to evaluate the efficacy of completed concrete canal in urban expansion area city M’sila prevent flood risks river Portem, by performing a hydraulic simulation using 2D program HEC-RAS and geographic information systems (SIG), this research after determining water catchment, extraction morphological characteristics, calculation maximum flow quantity Qmaxm 3/s based on series rainfall data for reed station period 37 years processing it spatially systems. areas exposed risk flooding have direct relationship with return, so that an 9.98 hectares was recorded return 10 years, 12.72 50 14.31 100 years. also showed importance HEC- RAS (SIG) evaluating efficiency channel floods contribute decision-making reduce resulting disasters.