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traffic on the segment equals or exceeds 5 percent of <br />total project traffic. For single-family only the most <br />directly accessed segment will be considered. On each <br />segment the number of trips projected to be <br />generated/attracted by an application being reviewed for <br />a concurrency determination will be compared to the <br />available capacity. If the available capacity is more <br />than the projected demand, a concurrency determination <br />certificate will be issued. If there is not sufficient <br />capacity available, the applicant has the option to <br />mitigate for additional capacity. No concurrency <br />determination certificate will be issued if the demand <br />exceeds available supply. <br />In addition to the manually updated computerized <br />concurrency database, the Community Development <br />Department will maintain an updated socio-economic <br />database by traffic analysis zone. This database will <br />be updated automatically with approval of concurrency <br />certificates, building permits, certificates of occupancy <br />and other project approvals. This database shall <br />constitute the vested alternative database. Using the <br />vested alternative database and the existing conditions <br />database, the staff will on a regular basis, but not less <br />than once each six months, run the FSUTMS model. For <br />each segment on the network, a new existing plus vested <br />volume will be obtained by taking the difference between <br />the vested run and the existing run and adding that <br />differential to the last counted volume for the segment. <br />(5) Drainage <br />(a) Drainage Supply (capacity) <br />The drainage portion of the Concurrency Management data <br />base will provide updated information regarding supply <br />and demand for drainage facilities in each drainage basin <br />or sub -basin as identified in the Drainage Sub -Element <br />in the 1990 Comprehensive Plan. The resulting balance <br />(supply -demand) will justify issuing a positive <br />concurrency determination if the drainage system can <br />adequately perform to the adopted level of service (both <br />quality and quantity) and if the level of service for the <br />drainage basin or sub -basin can be maintained or <br />bettered. The resulting balance (supply -demand) will <br />justify denying the concurrency determination application <br />if the demand exceeds supply (both quality and quantity) <br />or if the result is to lower the level of service below <br />the acceptable standards for the drainage basin. For the <br />purpose of evaluating concurrency applications which are <br />considered to be initial or final concurrency <br />129 <br />