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.
infiltration rates greater than 0.52 inches per hour, and a clay content less than 30%. Basins should. not be constructed in areas where fill has been used. Infiltration basins are not feasible where the slope of the contributing watershed is greater than 20%.