Groundwater resource assessment and safe yield analysis for a well field supplying Lomé (Togo)

The Lomé metropolitan area faces a growing drinking-water demand and local overexploitation of existing aquifers. Within this context, a new well field is planned east of Lake Togo to supply Lomé and nearby towns from the Continental Terminal (CT) aquifer. The study combines a hydrogeological review, field investigations, daily soil–water balance modelling, and analytical modelling to quantify renewable resources and safe yield. The planned well field is located on the Attitogon plateau. The sustainable yield in the Anfoin sector reaches 80,000 m3/day. Supply reliability is evaluated by comparing monthly available resources with operational demand, including an RCP6.0 climate change scenario to 2100. Results support a CT well-field design operated within conservative criteria to ensure long-term sustainability.