The British pint is about 20% larger than the American pint since the two systems are not compatible. Almost all other countries have standardized on the metric system, so the size of what may be called a pint varies depending on local custom.
It is usually measured by the depth (in mm) of the water layer that can enter the soil in one hour. An infiltration rate of 15 mm/hour means that a water layer of 15 mm on the soil surface, will take one hour to infiltrate. In dry soil, water infiltrates rapidly.
Groundwater comes from precipitation. Precipitated water must filter down through the vadose zone to reach the zone of saturation, where groundwater flow occurs. The rate of infiltration is a function of soil type, rock type, antecedent water, and time.The vadose zone includes all the material between the Earths surface and the zone of saturation.recipitated water must filter down through the vadose zone to reach the zone of saturation, where groundwater flow occurs. The rate of infiltration is a function of soil type, rock type, antecedent water, and time.