Background: The City of Windhoek (CoW) is faced with steady demographie growth, and growing informai settlements. The Municipality, which encompasses 326,000 inhabitants, is located in a semi arid area with annual rainfall averaging 370mm only and scarce surface water and groundwater resources. Windhoek's main water resource is transferred over several hundreds of kilometres from the Northern part of Namibia. Climate change is anticipated to result in higher temperatures, increased evaporation, and rainfall intensity across Namibia.