Flood Hazard Mapping in Rural Area: Case of Ephemeral Watercourses in SidiBoulenouar Zone

Imane Amar,Abdellah Azougay,Najat Amarjouf,Said Bengamra

doi:10.1051/e3sconf/202129801005

Abstract

The eastern region of Morocco is characterized by an arid to semi-arid climate. It is often confronted with heavy rainfall episodes that can generate floods that can cause adverse human and property damage. This work studies hydrological risk in the SidiBoulenouar area (Oujda province) to model floods and map risk areas. The method used is to determine the watersheds and their watercourses, then to calculate the flows with the mathematical formulas. Topographic data were extracted from a 12.5-m resolution DEM derived from the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer). GDEM (Global DEM). The DEM was used to delimit the hydrographic network with ArcMap software. The use of HEC RAS 1D was necessary to delimit the flooding area. The results of the 1D hydraulic modeling of the centennial flood showed that four ephemeral watercourses landlock the rural area of SidiBoulenouar at the time of the floods.

Highlights

Water is becoming increasingly important in our lives
The hydrological risks in Eastern Morocco are caused by severe floods resulting from heavy rainfall over a limited area in a short period
Hydrological risk modeling in the SidiBoulenouar area is a methodical work that consists of following a welldefined methodology. It starts by identifying the characteristic information that emerges from the Hassacreek basin and the largest in terms of surface area 2.20km2, followed by a hydrological study to describe the rain-flow transfer within the basins concerned and whose output corresponds to the specific flows for each return period such as T=10years, T=20, T=50, T=100

Summary

Introduction

It requires rational management to control its scarcity, and its excess This management is essential to ensure the supply of drinking and industrial water, agricultural needs, energy production, and the maintenance of the quality of our environment. This management requires the development of adequate methods and tools to minimize flood risks [1]. The hydrological risks in Eastern Morocco are caused by severe floods resulting from heavy rainfall over a limited area in a short period. These precipitations are, in most cases, sudden and have a relatively high peak flow. These precipitations are, in most cases, sudden and have a relatively high peak flow. [3]

Objectives

Methods

Conclusion