An enormous problem for farmers in West Africa is that their fertile soil
washes away during the heavy rainstorms and more than half of the rainwater
drains away into rivers. Soil technologist Dr Wim Spaan discovered that by
using a common kind of grass found in the area and already used as
livestock fodder, the farmers can make effective barriers against the run-
off water. “Farmers in Burkina Faso will no longer have to worry that their
soil ends up in a reservoir in Ghana.