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Table II -8 Unincorporated County Area Residents per Housing Unit (with Single Family Tiering ) 3 dm 4 Single Family 2 . 518 100 . 00% n/a Less than 1 , 500 sf 91 .41 % 2 . 302 From 1 ,500 to 2,499 sf 102 . 10% 2 . 571 2 ,500 sf or greater 111 . 07% 2 .797 Multi-Family 1 .731 n/a 1 .731 Mobile Home 1 . 831 n/a 1 . 831 Weighted Average -- Unincorporated IRC 2 .266 ( 1 ) Source : Table II-4 (2) Source : Table II- 5 Functional Population Introduction For four of the eight impact fee program areas (Public Buildings , Law Enforcement, Fire/EMS , and Correctional Facilities) , it is appropriate to apply a concept referred to as "functional population" in the impact fee literature . In the case of Parks and Recreation Facilities, Library Facilities , and Public Education Facilities impact fee programs , because the fee is imposed only on residential uses, it is not necessary to use functional population . The Solid Waste Facilities impact fee schedule is based on the waste generation levels of different land uses . It should be noted that IRC uses the term "functional population" in the Comprehensive Plan but with a different definition (refers to permanent plus seasonal population) . This concept, as used in the impact fee analysis, is a generally accepted methodology for these impact fee areas and is based on the assumption that demand for certain facilities is generally proportional to the presence of people . The Concept and Calculation of Functional Residents As IRC grows, it will need to expand its supply of public facilities . The expansion needs of some facilities , such as water and sewer, may be estimated using observed demand extrapolated into the future . The expansion needs for other facilities, however, may be more complicated . For example, the demand for police and fire facilities varies by land use in ways that are not always clear. How many units of police or fire service are needed to serve the needs of commercial, industrial, or single family residential Tindale -Oliver & Associates, Inc . Indian River County February 2005 11-6 Impact Fee Study