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Item 5: Resolution Modifying Stormwater SDC
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Item 5: Resolution Modifying Stormwater SDC
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Agenda Item Summary
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5/22/2006
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<br />Appendix D <br /> <br />Stormwater System Charge Detail <br /> <br />1.0 Formula <br /> <br />The impact analysis for the stormwater system is based on square footage of impervious <br />surface, which creates an impact on the stormwater system by land use type. Impervious <br />surface is defined in section 6.406 Eugene code, 1971 as "any hard surface area which causes <br />water to run off the surface in greater quantities or at an increased rate of flow from conditions <br />pre-existing to development. Common impervious surfaces include, but are not limited to, <br />rooftops, walkways, driveways, parking lots, or concrete or asphalt surfaces." The estimated <br />non-assessable cost of the system-wide capacity from future capacity-enhancing projects, as <br />contained in the Stormwater SOC-Eligible Project List, and the estimated available capacity in <br />the existing stormwater system projected to be used by new development is used as the basis <br />for determining the stormwater SOC. <br /> <br />The stormwater SOC is comprised of an improvement fee and a reimbursement fee, as new <br />development will require the construction of additional system capacity as well as the use of <br />available capacity in the existing system. The per unit cost of additional capacity for the <br />improvement fee is based on the value of the system-wide capacity of future capacity- <br />enhancing projects (current planned projects are listed in the Stormwater SOC-Eligible Project <br />List, Table 10) divided by the total projected impervious surface area that will be added by new <br />development at build-out within the Urban Growth Boundary (UGB). The per unit cost of <br />existing capacity for the reimbursement fee is based on the value of available system-wide <br />capacity within the existing system projected to be used by new development divided by the <br />total projected impervious surface area that will be added by new development at build-out <br />within the UGB. <br /> <br />The value of the future stormwater system is based on the estimated costs of planned future <br />capacity-enhancing stormwater projects contained within stormwater plans and the Capital <br />Improvement Plan (CIP). Of that total value, the SOC-eligible component is attributable to those <br />portions of future projects that are non-assessable and capacity-enhancing and related to the <br />demands of future development; Le. add new capacity for new users. <br /> <br />The total value of the existing system is estimated based on the replacement cost of the <br />stormwater system components, which include both piped system and open channel system <br />components. Assessable costs are excluded from the SOC-eligible existing system costs. <br />Assessable costs are determined using the approach specified in the City Code. The city <br />assesses up to and including the first 24 inches of pipe diameter or equivalent capacity. The <br />non-assessable portion of stormwater system costs (SOC eligible costs) is based on <br />replacement costs minus assessable costs. The portion of non-assessable existing system <br />value allocated to new development (SOC-eligible value) is established by determining the <br />percent of piped system and open channel system capacity projected to be used by new <br />development. The use of capacity of the existing system is estimated with use of hydraulic <br />modeling to identify existing available capacity (based on existing land use and flow data) and <br />expected future conditions (based on Metro Plan designations). <br />
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