The Ourika catchment area has experienced a number of appalling floods, particularly the one in 1995, which was the most devastating in both human and material terms. To alleviate the impact of these floods, various erosion control techniques have been implemented in the Ourika catchment to reduce the problems associated with erosion. One of the anti-erosion techniques is the installation of sills in the ravines of the Ourika catchment area. These...