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Comprehensive Plan Capital Improvements Element Concurrency requires that each facility within the geographic scope of a proposed project's impact area have sufficient capacity to accommodate the project's demand. If that capacity is not available, the project cannot be approved. The principal function of the concurrency management system then is to provide a mechanism whereby demand and capacity measures can be compared on a project by project basis. Table 6.18 provides the criteria for establishing a demand to capacity comparison for a proposed project. While most of the characteristics are self-explanatory, one needs clarification; this is the geographic scope for the traffic public facility category. For concurrency purposes, affected roadways will be those roadways impacted by a project's traffic. All projects, regardless of size, impact the roadway on which the project fronts. In addition, other roadways further removed from the project are impacted. For concurrency purposes, roadways that gain 5% or more of the project's traffic or 50 or more of the project's generated trips, whichever is less are included. Level -of -service standards for concurrency related facilities are to apply to all requests for development orders and permits. Level - of -service standards are measurements based on peak -hour trips and based on volume ranges or average travel speed for the peak hour. Demand Demand is an important component of the concurrency management system Essentially, demand is a measure of facility use. When compared to facility capacity, demand can indicate the level -of -service for the facility. As depicted in Table 6.18, 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. These 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. These increases in existing demand can be identified through facility use Community Development Department Indian River County Supplement #13; Adopted November 18, 2008, Ordinance 2008-018 48