How does runoff affect the soil moisture content ?
Water falling on the surface of the land will either soak into the soil (infiltrate 1) and percolate downward through the soil profile or runoff 1 the surface. Water that infiltrates into the soil profile will raise the water content. If the rate water falls on the surface exceeds the rate water enters the soil and percolates downward, then the soil at the surface becomes saturated and excess water must runoff, even if the lower part of the soil profile is dry.
