The Gnomonkah lowland, located in the Katiola area of C te d'Ivoire, concentrates just about all the problems faced by rice growers in the Hambol region. Not least of these is the lack of control over geomorphological constraints. These constraints, which are both static and hydrodynamic, can be summed up in a complex problem: that of controlling water on sites whose development remains virtually unfinished. Lowlands are characterized by specific...