The user has two options in determining the HRU distribution: assign a single HRU to each subwatershed or assign multiple HRUs to each subwatershed. If a single HRU per subbasin is selected, the HRU is determined by the dominant land use category, soil type, and slope class within each watershed. If multiple HRUs are selected, the user may specify sensitivities for the land use, soil, and slope data that will be used to determine the number and kind of HRUs in each watershed.