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.
As you are going to carry out a simulation, I dont recommend to use tabulated values. As Gaur has mentioned, infiltration rate is one of a highly varied soil physical parameter, especially lands which are highly exposed to human activities. Best way is get the field measurements using double ring infiltro-meter. you can find detailed methodology of it from FAO inline of previous technical papers on irrigation and drainage from same agency.