Kerkennah, an example of rainwater reuse to meet water challenges in Tunisia

Abstract

Between July 10 and 14, 2023, a team of Algerian researchers visited the Kerkennah archipelago (Tunisia) as part of a bilateral research project on green infrastructure for sustainable rainwater management in arid and semi-arid environments (2021-2024). This visit provided an opportunity to explore local rainwater harvesting techniques, combining ancestral farming know-how with conventional municipal methods. The study focused on mechanical processes (meadow ponds, cisterns) and biological/cultural practices (multistage, intercropping, hydroponics).The results demonstrate the effectiveness of these approaches to stormwater management and soil conservation, vital to face  climate change. Domestic and agricultural cisterns (Majels) are essential for water storage and supply. Hydroponics, tested locally, offers the potential for water-efficient agricultural production. In addition, solutions based on adapted plant species are  considered to manage flooding, and the geolocalization of green infrastructures aims to preserve biodiversity. The integration of solar water drilling for irrigation illustrates a promising energy transition.The Kerkennah experience exemplifies resilience, highlighting the necessity of rehabilitating traditional water management practices while embracing technological innovation. Securing water resources, combating rural exodus, and providing a sustainable development model for similar Maghreb regions requires robust public policy, including widespread cistern implementation and mandatory rainwater harvesting for new construction.