C. Groundwater
Infiltration is the process by which rainwater becomes
groundwater. Through this process the water on the ground surface enters the
soil. Infiltration rate is a measure of the rate at which soil can absorb
rainfall or irrigation. It is measured in inches per hour or millimeters per
hour and it decreases as the soil saturated. Infiltration is governed by two
forces, gravity and capillary action. The rate of infiltration can be observed
through the characteristics of the soil.
