Rural Residential District. These areas are characterized by some or all of the following: The plateau climate for growing that is common with most of Erie County, varying value of agricultural soils, general roadside housing strip development, a generally poor soil situation for on-lot sewage systems; the rural residential areas offer a midpoint range between the residentially diversified suburban district and the specialized agricultural districts. Land uses include general agricultural activities of crops/animal husbandry, pasturage/timber/land/open space, evenly distributed with lower-density estate residential (self-sewered) uses and medium-density subdivisions (group sewered) or lower-density two-family uses and includes associated public, institutional and recreational uses. The maximum density of residential dwelling units in the R-1 District shall be two units per acre for single-family dwellings, and three units per acre for two-family dwellings.