Sloping land is somewhat impermeable to water, thus a...

Sloping land is somewhat impermeable to water, thus a considerable amount of water is lost by runoff. Crops grown on these sites are less likely to be adversely impacted by saturated soil conditions during prolonged rainy periods, but are prone to a loss of natural fertility due to erosion. Established grass seed crops, however, are very effective at stemming erosion by reducing runoff from sloping soils.