RainFlow

Abstract

In recent years, Algeria in general—and the wilaya of Aïn Témouchent in particular—has been facing serious challenges related to water scarcity due to climate change and decreasing rainfall levels. In this context, the continued use of potable water for irrigating green spaces adds further pressure on already limited resources, especially in urban areas. This study proposes a practical and sustainable solution by designing a rainwater harvesting and reuse system for the irrigation of “Lalla Khadidja” Park, located in Aïn Témouchent and covering an area of 1.769 hectares. The proposed system collects rainwater from impermeable surfaces and green areas, storing it in à 1890 m3 closed tank, supplemented by an open basin of 400 m3. A drainage network is also included, capable of handling a peak flow of 46.56 L/s. Furthermore, an irrigation network has been designed using both rotating and fixed sprinklers, controlled by a centralized system and electric valves to adapt watering schedules to actual needs and climatic conditions. The total annual water requirement is estimated at 2905.984 m3, largely covered by harvested rainwater, with a secondary contribution from an existing groundwater well. The study concludes that the proposed system effectively reduces reliance on potable water and provides a sustainable water resource for green space irrigation, with potential for replication in other urban development projects.