1/27/20121Infiltration and RunoffInfiltration capacity•Infiltration capacity: the maximum rate (L/T) at which infiltration can occur under specific conditions of soil moisture. Infiltration capacity is a function of the soil’s water content. •For a dry soil, the infiltration capacity is high. •Surface tension between the soil particles and the water draws the water downward into the soil.Infiltration capacity is a function of the soil’s water content. •Initially, for a dry soil Infiltration capacityis high•As the water content increases in the soil, the capillary forces diminish, and the infiltration capacity decreases. In addition, colloidal particles, clays, swell as the moisture content increases, further reducing the infiltration capacityreducing the infiltration capacity.Eventually, the infiltration capacity reaches a constant equilibrium value.Rain rate > infiltration capacity, than the rain will sit on the ground surface and contribute to either depression storage, overland flow, or will evaporate. If the rain rate < the infiltration capacity, then all of the rainfall will infiltrate
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