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MEMSeattle,Washington <br /> www.pacland.com <br /> T 206.522.9510 <br /> TURNING VISIONS INTO REALITY <br /> control structure at the south side of the site, where it enters the City of Everett municipal <br /> stormwater system. <br /> See Appendix A, Figures 2 and 3 for exhibits showing the existing conditions and basin <br /> maps. The tables below summarize the existing conditions and existing flow rates. <br /> Table 1 — Pre-Redeveloped / Existing Conditions <br /> Condition Area (AC) <br /> Roof Tops Flat 1.64 <br /> Parking Flat 6.07 <br /> C, Lawn, Flat 0.86 <br /> Total 8.57 <br /> Table 2 — Pre-Redeveloped / Existing Flow Rates <br /> Event Flow rate(cfs) <br /> 2-year 0.916 <br /> 25-year 2.024 <br /> 100-year 2.805 <br /> C. Redeveloped Hydrology <br /> The proposed redevelopment of the site will not substantially modify the existing <br /> stormwater facilities as described above. The existing underground storage pipe and flow <br /> control structure will remain. <br /> See below for a breakdown of the developed site conditions and the methods used to <br /> obtain the redeveloped basin flows. <br /> Hydrologic Modeling Method <br /> Hydrologic analysis of the project area was performed using a calibrated continuous <br /> simulation hydrologic model as required by Volume I, Chapter 5 of the Manual. The <br /> Western Washington Hydrology Model (WWHM) was used. <br /> For detailed printouts of the hydrologic model results, please see the Appendices below. <br /> Basin Summary <br /> The proposed development was modeled with basins as shown in the table below and <br /> Figure 4 in Appendix A. <br /> Table 3 — Proposed Conditions <br /> Condition Area (AC) <br /> Roof Tops Flat 2.10 <br /> Everett Mall Plaza Parcel Ill Retail Expansion Stormwater Site Plan Page 19 <br />