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CATCHMENT PROFILE: RL-13 <br />Rice Lake Subwatershed Assessment <br />PROJECT 1: Rain Gardens <br />Treatment Analysis: <br />The following table summarizes the amount of treatment needed to achieve different <br />levels of phosphorus reduction. Reductions assume that rain gardens are placed in <br />ideal locations to capture the maximum amount of stormwater. <br />70% TP <br />Reduction <br />50% TP <br />Reduction <br />30% TP <br />Reduction <br />10% TP <br />Reduction <br />TSS Reduction Ib/ r <br />32,477 <br />26,480 <br />19,508 <br />10,193 <br />TSS Reduction % <br />83% <br />68% <br />50% <br />26% <br />TP Reduction Ib/ r <br />86.7 <br />61.9 <br />37.2 <br />12.4 <br />Volume Reduction <br />acre-feet/ r <br />71.5 <br />53.4 <br />34.1 <br />11.7 <br />Volume Reduction % <br />68% <br />51 % <br />32% <br />11 % <br />Live Storage Volume <br />cubic feet <br />30,511 <br />16,734 <br />7,995 <br />2,187 <br />Rain gardens Needed <br />305 <br />168 <br />80 <br />22 <br />Materials/Labor <br />$1,067,500 <br />$588,000 <br />$280,000 <br />$77,000 <br />Design Finalization <br />$122,610 <br />$67,536 <br />$32,160 <br />$8,844 <br />Promotion & <br />Administration Costs <br />$34,815 <br />$19,745 <br />$10,065 <br />$3,685 <br />Total Project Cost <br />$1,224,925 <br />$675,281 <br />$322,225 <br />$89,529 <br />Cost/lb Phosphorus <br />$14,128 <br />$10,909 <br />$8,622 <br />$7,220 <br />Annual O&M <br />$22,875 <br />$12,600 <br />$6,000 <br />$1,650 <br />Term Cost/lb/yr (10 yr) <br />$1,677 <br />$1,294 <br />$1,027 <br />$855 <br />Model Inputs: <br />Parameter <br />Input <br />Pervious Curve Number <br />49 <br />Indirectly Connected Impervious <br />Fraction <br />0.12 <br />Directly Connected Impervious <br />Fraction <br />0.22 <br />Hydraulic Conductivity <br />3.39 in/hr <br />-39- <br />