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Indian River County I Impact Fee Update Study number of employees, since the service-demand characteristics can vary considerably by type of industry. Functional population is the equivalent number of people occupying space within a community on a 24-hour-day, 7-days-a-week basis. A person living and working in the community will have the functional population coefficient of 1.0. A person living in the community but working elsewhere may spend only 16 hours per day in the community on weekdays and 24 hours per day on weekends for a functional population coefficient of 0.76 (128-hour presence divided by 168 hours in one week). A person commuting into the county to work five days per week would have a functional population coefficient of 0.30 (50-hour presence divided by 168 hours in one week). Similarly, a person traveling into the community to shop at stores, perhaps averaging 8 hours per week, would have a functional population coefficient of 0.05. Functional population thus tries to capture the presence of all people within the community, whether residents, workers, or visitors, to arrive at a total estimate of effective population need to be served. This form of adjusting population to help measure real facility needs replaces the population approach of merely weighting residents two-thirds and workers one-third (Nelson and Nicholas 1992). By estimating the functional and weighted population per unit of land use across all major land uses in a community, an estimate of the demand for certain facilities and services in the present and future year can be calculated. The following paragraphs explain how functional population is calculated for residential and non-residential land uses. Residential Functional Population Developing the residential component of functional population is simpler than developing the non-residential component. It is generally estimated that people spend one-half to three-fourths 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 the Indian River County functional population, an analysis of the County's population and employment characteristics was conducted. Based on this analysis, it was estimated that people, on average, spend 16.4 hours, or approximately 68 percent, of each 24-hour day at their place of residence and the other 32 percent away from home. This analysis is presented in Tables A-5 and A-6. Tindale-Oliver&Associates, Inc. Indian River County June 2014 A-5 Impact Fee Update Study 189