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Comprehensive Plan Capital Improvements Element As depicted in Table 6.16, demand can be measured quantitatively for each public facility category. While the demand function for each facility consists of applying a rate to the number of facility users, estimation of total demand is more complex. For concurrency management purposes, demand can be divided into three types: existing, committed, and projected. Each must be considered separately for purposes of concurrency management. Existing Demand Existing demand is simply the current level of use for a facility. For a roadway, it is the number of peak hour/peak season/peak direction trips; for a school, it is the number of full-time enrolled students; for water and wastewater treatment plants, it is the existing flow volume measured in gallons per day. Those figures are included within applicable plan elements. Existing demand then reflects the use of a facility by the current population. When compared to capacity, existing demand can show if the facility has unused capacity or if it is functioning over capacity. Existing demand, however, is not static. As population increases and dwelling units come on-line, existing demand increases. Those increases in existing demand can be identified through facility use measurements. For example, regular traffic counts done on roads or treatment plant flow records are examples of facility use measurements indicating existing demand levels. As existing demand levels for facilities are updated, committed demand levels must be reduced if projects representing committed demand have come on-line. Committed Demand Committed demand is a measure of the impact that approved development projects with reserved capacity will have on facilities. When added to existing demand for a facility, the committed demand for that facility will produce a more accurate estimate of unused capacity. That estimate of unused capacity represents the amount of capacity that can realistically be allocated to new projects. Committed demand must be determined by identifying all projects for which capacity has been reserved through issuance of initial concurrency certificates which are still valid. Then the specific facilities that will be impacted by those projects with reserved capacities must be determined; those facilities will be roadways and the landfill, and they may be treatment plants, drainage conveyances, and recreation facilities. Finally, the total demand on each facility attributable to committed demand will be determined. Applicable elements of the plan identify the rates to be applied to each project to determine facility demand. Traffic volumes, for example, can be derived by applying a trip rate to the size of the project. Sanitary sewer and potable water both have rates of 250 gallons per day per equivalent Community Development Department Adopted December _ 2021, Ordinance 2021 - Indian River County 41 172