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FOR DISCUSSION PURPOSES ONL <br />Stormwater Impact Fund Calculation <br />Volume Reduction Requirement from Impervious Area: Retention of 1-inch/ acre of imperviousness <br />1-inch x 1 acre = 1 acre -inch: lacre-inch x lfoot/ 12-inches = 0.083 acre-feet <br />0.083 acre-feet x 43560 square feet /acre = 3630 cubic feet <br />3630 cubic feet x $6 /cubic feet (assuming basin depth is 1 foot) = $21,780 <br />$21,780 <br />Contingencies — 10% + 2178 <br />$23,958 <br />Administration-30% + 7187 <br />$31,145: Round to $40,000 <br />