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Determine SDC Credit <br />At this point, the derivation of each element used to determine the SDCs for individual developments <br />has been described, with the exception of the SDC credit (line 6 of Table 1). A credit is provided to <br />ensure that future users don't double pay for system capacity - both through the SDC and through user <br />fee rates which will be used to pay for a portion of 20-year project list costs. <br /> <br />Table 9 presents the improvement fee credit calculation, in summary format (10 years instead of 20). <br />The credit is based on a present-worth analysis, structured as follows: <br /> <br />1. Annual capital costs (adjusted for inflation) associated with 'existing customers' share of the project <br /> list costs (net of rehabilitation costs) are estimated based on the recommended phasing schedule. <br /> <br />2. The annual capital expenditures are reduced by revenues from reserves and reimbursement fees to <br /> estimate required debt funding <br /> <br />3. Debt services costs are estimated for repayment of borrowed funds (assuming 5 percent interest) <br /> <br />4. Future billing units (average flow and pounds of BOD and TSS) are estimated for the planning <br /> period based on system planning criteria <br /> <br />5. The annual user rate supported debt service per billing unit is determined for the life of the debt. <br /> <br />6. The present value of the future stream of rate payments is determined for each year of the planning <br /> period. <br /> <br />The unit costs of BOD and TSS are consolidated into a single strength parameter for the credit, as noted <br />above for the reimbursement and improvement fee components. The credit per unit for 2005 (used in <br />Table 1) is indicated in bold in Table 9. <br /> <br /> <br />