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SOUNDVIEW TECHNOLOGY CENTER EVERETT, WA <br /> OUTFALL SYSTEM <br /> The detained stormwater will be released at locations A, B, C, and D. Locations are sized based on the <br /> 100-year detained release rates or less. Outlet systems A— C will discharge through 50' level spreaders at <br /> lower elevations of the site drainage basins as shown on the developed conditions map. The level <br /> spreader will be a "T" type connection located at the surface with rock below. The 12" HDPE level <br /> spreader pipe will have two 1.5" holes every 12" on center. Basin D outlet system will be to a 7'x8' rock <br /> pad. <br /> CONVEYANCE SYSTEM ANALYSIS AND DESIGN <br /> A full conveyance system analysis has been performed using the Autodesk® Storm & Sanitary Analysis. <br /> The vaults overflow elevation (100-year water surface) has been used as the starting tail water elevation. <br /> • Storm Chamber System #1 = 423.75 <br /> • Vault#2 = 340.50 <br /> • Vault#3 = 340.65 <br /> • Vault#4 = 418.20 <br /> • Vault#5 = 340.50 <br /> The 100-year storm event (3.25" in 24-hours) has been used in sizing the conveyance system per 5.4.1 City <br /> of Everett Stormwater Management Manual. No catch basin overtopping is shown per the analysis, see <br /> Appendix F. <br /> 100-YEAR FLOOD/OVERFLOW CONDITION <br /> The stormwater conveyance system for this project has been designed to address storm events in <br /> accordance with common industry practices. In the event of a larger storm, the system may fail. In this <br /> case, the runoff from larger events will overflow to the vault control structures and continue to flow to the <br /> intended discharge point at each basin. <br /> SEPTEMBER 23, 2022 STORMWATER DRAINAGE REPORT PAGE 32 <br />