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Indian River County I Impact Fee Update Study The resulting percentage from Table A-6 is used in the calculation of the residential coefficient for the 24-hour functional population. These actual calculations are presented in Table A-8. Non-Residential Functional Population Given the varying characteristics of non-residential land uses, developing the estimates of functional residents for non-residential land uses is more complicated than developing estimated functional residents for residential land uses. Nelson and Nicholas originally introduced a method for estimating functional resident population, now used internationallyl. This method uses trip generation data from the Institute of Transportation Engineers' (ITE) Trip Generation Manual and TOA's Trip Characteristics Database, information of passengers per vehicle, workers per vehicle, length of time spent at the land use, and other variables. Specific calculations include: • Total one-way trips per employee (ITE trips multiplied by 50 percent to avoid double counting entering and exiting trips as two trips). • Visitors per impact unit based on occupants per vehicle (trips multiplied by occupants per vehicle less employees). • Worker hours per week per impact unit (such as nine worker-hours per day multiplied by five days in a work week). • Visitor hours per week per impact unit (visitors multiplied by number of hours per day times relevant days in a week, such as five for offices and seven for retail shopping). • Functional population coefficients per employee developed by estimating time spent by employees and visitors at each land use. Table A-7 also shows the functional population coefficients for non-residential uses in Indian River County. The functional population coefficients in Table A-7 were used to estimate the County's functional population in Table A-8. 1 Arthur C.Nelson and James C.Nicholas,"Estimating Functional Population for Facility Planning,"Journal of Urban Planning and Development 118(2):45-58(1992) Tindale-Oliver&Associates, Inc. Indian River County June 2014 A-7 Impact Fee Update Study 197