Prospects for rehabilitation of man-made lake system of Yamoussoukro (Ivory Coast)

摘要

Yamoussoukro, the political capital of Ivory Coast, is characterized by ten lakes built in the 1970s. These lakes cover an area of approximately 140 ha, with a catchment area close to 28.5 km2. Since the creation, they lost their aesthetic charm and they are today almost completely flooded by aquatic plants, with the exception of three lakes. This eutrophication is attributable to the watershed use, and to the activities developed on the watersides and in the neighbouring habitats (domestic waste, oil, sewage, sludge drain). Besides, they are affected by a modification of their water balance, due to hydrological and hydrodynamical modifications, increased sedimentation and physicochemical pollutions. We propose here several complementary strategies for restoring the integrity status of these man-made lakes, protecting water resources and natural environments, in order to improve public health, and contribute to the economic and social development of the neighbouring populations.