Rainwater Harvesting for Degraded Rangeland Rehabilitation in the Abu Fhihil Sub-basin, Riyadh, Saudi Arabia

In order to achieve the objectives set out in the Kingdom of Saudi Arabia’s rangeland development strategy and its associated implementation plan, a series of programs, initiatives, and projects have been developed. One such project is the rehabilitation of degraded rangelands through the utilization of rainwater harvesting techniques. Indeed, in regions where water is scarce, rainwater harvesting represents an efficient solution for utilizing renewable water resources, thus contributing to the mitigation of the impacts of water scarcity in arid zones. Moreover, the deployment of rainwater harvesting techniques constitutes an important component in the restoration of degraded rangeland. The study was developed in accordance with a pre-established set of activities, as outlined in the research methodology. The proposed techniques for the collection of rainwater in the AbouFhihil area are the construction of stone terraces on the hills and the construction of check dams in the main watercourse and gullies. Additionally, the construction of small crescent-shaped basins in the lower part of the area is recommended. The implementation of these hydraulic structures will result in the slowing down of runoff, the reduction of erosion and the recharging of groundwater. Furthermore, the construction of these hydraulic structures will facilitate the provision of water for trees, which will consequently exhibit accelerated growth.