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Comprehensive Plan Capital Improvements Element 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 residential unit. Other public facility rates are discussed fully in their applicable Comprehensive Plan Element. Like existing demand, committed demand must be determined on a facility by facility basis. For example, both existing demand and committed demand must be determined for each major roadway, each school, each treatment plant, each major drainage conveyance, and the active cell in the landfill. Also, like existing demand, committed demand estimates must be modified as projects are completed; committed demand estimates must also be modified as new development orders are approved and old development orders are terminated. Community Development Department Indian River County Adopted , 2013, Ordinance 2013- 43