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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 measurements. For example, regular traffic counts done on roads or treatment plan 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. o Committed Demand Committed demand is a measure of the impact that approved development projects 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. This 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 development orders have been approved and which are still valid. Then the specific facilities which will be impacted by these projects must be determined; these facilities will be roadways and the landfill, and they may be treatment plants, drainage conveyances, and recreation facilities. Finally, the amount of demand on each facility attributable to committed demand must be estimated. 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 the 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 treatment plant, each major drainage conveyance, each park category by district, and the active cell in the landfill. Also, like existing demand, committed demand estimates must be modified as projects are completed and the impacts are measured by existing demand; committed demand estimates must also be modified as new