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Indian River County 1 Impact Fee Update Study <br />The resulting percentage from Table A-6 is used in the calculation of the residential <br />coefficient for the 24-hour functional population. These actual calculations are presented in <br />Table A-8. <br />Non -Residential Functional Population <br />Given the varying characteristics of non-residential land uses, developing the estimates of <br />functional residents for non-residential land uses is more complicated than developing <br />estimated functional residents for residential land uses. Nelson and Nicholas originally <br />introduced a method for estimating functional resident population, now used <br />internationally'. This method uses trip generation data from the Institute of Transportation <br />Engineers' (ITE) Trip Generation Manual and TOA's Trip Characteristics Database, <br />information of passengers per vehicle, workers per vehicle, length of time spent at the land <br />use, and other variables. Specific calculations include: <br />• Total one-way trips per employee (ITE trips multiplied by 50 percent to avoid double <br />counting entering and exiting trips as two trips). <br />• Visitors per impact unit based on occupants per vehicle (trips multiplied by <br />occupants per vehicle less employees). <br />• Worker hours per week per impact unit (such as nine worker -hours per day <br />multiplied by five days in a work week). <br />• Visitor hours per week per impact unit (visitors multiplied by number of hours per <br />day times relevant days in a week, such as five for offices and seven for retail <br />shopping). <br />• Functional population coefficients per employee developed by estimating time spent <br />by employees and visitors at each land use. <br />Table A-7 also shows the functional population coefficients for non-residential uses in <br />Indian River County. The functional population coefficients in Table A-7 were used to <br />estimate the County's functional population in Table A-8. <br />1 Arthur C. Nelson and James C. Nicholas, "Estimating Functional Population for Facility Planning," Journal of Urban Planning <br />and Development 118(2): 45-58 (1992) <br />Tindale -Oliver & Associates, Inc. Indian River County <br />June 2014 <br />A-7 Impact Fee Update Study <br />187 <br />