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07/08/2020 P&Z Packet
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07/08/2020 P&Z Packet
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07/08/2020
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of the site drains to an existing private ditch/wetland area to the north of the site. A <br />small portion at the south of the site drains through an existing culvert along Birch St <br />(CSAH 34). The western portion of the site drains to the northwest to an existing private <br />ditch. <br />The surface water will flow through three new ponds. Pond 200 located in the middle of <br />the site will pick up surface water from the south portion of the site and direct it towards <br />Pond 100. Pond 100 will pick up surface water from the majority of the site and <br />discharge to the west to an existing private ditch. Pond 400 will receive the remaining <br />surface water and discharge to an existing ditch to the north. <br />After the project is completed, the site will include approximately 8.8 acres of new <br />impervious surfaces including the streets, sidewalks, paths, parking lots, and rooftops. <br />Due to poor soils in the south portion of the site and a high groundwater table in the <br />north portion of the site, infiltration is not feasible. <br />The applicant used a HydroCAD model based on the Atlas 14, 24-hour storms to design <br />the storm sewer conveyance system and ponds. The site is designed to reduce site runoff <br />rates for the 2-, 10-, and 100-year rainfall events." <br />Per the RCWD CAPROC dated April 8, 2020: <br />Soil conditions vary over the sloping site, with HSG D sandy lean clays (CL) at the <br />higher elevations, and HSG A/B poorly graded sands and sands with silt (SP/SP-SM) <br />with sandy lean clays below. The HSG D soils in addition to the high water table below <br />the HSG AB soils make infiltration infeasible for the site. Thus, stormwater ponds are <br />acceptable to meet the water quality requirement. The pond sizing, and outlets and <br />overflows are consistent with design criteria. 100% of the project area either flows to the <br />ponds or meets design criteria. Additional TSS removal is not required. The applicant has <br />met all the Water Quality requirements and the design criteria of RCWD Rule C: <br />Stormwater Management Plans. <br />Discharge Rate Comparison <br />2-year (cfs) <br />10-year (cfs) <br />100-year (cfs) <br />Existing <br />Proposed <br />Existing <br />Proposed <br />Existing <br />Proposed <br />North to Private Ditch <br />3.5 <br />2.3 <br />5.1 <br />3.9 <br />6.9 <br />5.7 <br />West to Private Ditch <br />11.6 <br />9-.2 6.8 <br />34.1 <br />2&7 25.7 <br />82.8 <br />74--7 73.9 <br />South through <br />Culvert under Birch <br />Street <br />4.4 <br />3.5 <br />8.0 <br />6.5 <br />14.6 <br />11.9 <br />Totals* <br />19.2 <br />1 421-.5-9.8 <br />46.7 <br />3-- 32.2 <br />103.3 <br />87.0 <br />*Difference due to time of concentration <br />Post -development stormwater discharge rates are less than the pre -development rates. <br />N. <br />
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