Submitted by: University of Windsor
Implemented country: Canada
Title: Gully Erosion, Nigeria
In Southeastern Nigeria, catastrophic gullies are formed by surface runoff in the fine- to medium grained sands and the medium- to coarse-grained sandstone of the Anambra-Imo basin region. Gully erosion refers to the localized removal of soil, sediments and poorly consolidated sedimentary rocks by running water to form steep-sided ravines. Gully processes ultimately yield a degraded “badlands” terrain comprising knife-edged ridges separated by deep ravines; such land is no longer amenable to agricultural use. The pronounced erosion of the land surface causes an overall lowering of the water table. The project goal was to reduce gully erosion. The purpose was to explain the localization of gullies in the area and to design a strategy for the prevention and control of gully processes. The project research included detailed mapping of the gully systems over a period of eight years. The project outcomes were controlled runoff at the observation sites, sustainable control of gully erosion at the sites of emergency, empowered village partners, and pluralism of environmental awareness in and around the partner villages.