Nyandera catchment is characterized by the typical degraded agricultural lands that hardly supports subsistence farming, the land is usually patchy with vegetation, especially after the crops have been harvested. This have been aggravated by overgrazing and intensive deforestation to meet the domestic needs and settlements, which has led to large scale sheet erosion, while along the roads and cattle drives gullies are forming. The eroded soils are all carried to the few water sources which include ponds, small streams and open shallow wells, silting them and affecting water availability and quality. The siltation and pollution finally end up in the Nyandera stream affecting River Yala that drains into lake Victoria.