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facilities and services in the present and in a future year can be calculated . The following *4440 paragraphs explain how functional population is calculated . Residential Functional Population Developing the residential component of functional resident population is simpler than developing the nonresidential component. It is generally assumed that people spend one- half to two -thirds of their time at home and the rest of each 24-hour day away from their place of residence . In developing the residential component of IRC functional population for fees using a 24-hour versus 11 -hour approach, an analysis of IRC population and employment characteristics was conducted . Based on this analysis, it was estimated that, in the case of 24-hour days, people, on average , spend 15 . 6 hours, or 65 percent, of each 24 -hour day at their place of residence and the other 35 percent away from home . In the case of 11 -hour days , people spend 3 . 8 hours , or 35 percent of their time, at their place of residence and the remaining 65 percent away from home . This analysis is presented in Appendix A, Tables A-9 through A- 11 , and resulting percentages are displayed in Tables II-9 and II- 10 . Nonresidential Functional Population Developing estimates of functional residents for nonresidential land uses is more complicated than developing estimates of functional residents for residential land uses, given the varying characteristics of non-residential land uses . Nelson and Nicholas originally introduced a method for estimating functional resident population, now used ,.Kr'' internationally . ' This method uses trip generation data from the Institute of Transportation Engineers' (ITE) Trip Generation Manual , information on 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 times 50 percent to avoid double counting entering and exiting trips as two trips) . • Visitors per impact unit based on occupants per vehicle (trips times occupants per vehicle minus employees) . • Worker hours per week per impact unit (such as nine worker hours per day times five days in a work week) . • Visitor hours per week per impact unit (visitors times number of hours per day times relevant days in week such as five for offices and seven for retail shopping) . • Functional population coefficients per employee developed by considering time spent by employees and visitors at each land use . Table 11 -9 shows the functional population coefficients for nonresidential uses/categories in IRC for the year 2004 based on a 24 hours per day, 7 days per week analysis . ' 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 February 2005 II - 8 Impact Fee Study