Physiographic Study of the Sidi Chahed Dam Watershed (Morocco)

The use of GIS software allowed to characterize the area of the Sidi Chahed dam and its retaining, from the SRTM images by realizing the hypsometric map, The map of the slopes and their exposures, the sub-watershed map, the hydrographic network thematic map and its classification, and the superposition of the hydrographic networks. From the thematic maps realized for the catchment area studied, several geometric calculations were affected out to characterize the sub-watersheds from a length point of view, width, equivalent rectangle, surface, perimeter, and compactness index. These parameters have shown that the sub-watersheds studied are of elongated shape favoring low flows and are characterized by a greater water delivery time and a considerable total quantity of precipitation harvested. The high altitudes are located at the upstream levels of the upstream Mikkes sub-basins and Sidi Khlef. The slopes also showed the predominance of the north and Northwest orientations with respectively 24.12 % and 20.34 % of the total slopes of the Mikkes watershed.