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.� ERC CC&V Poverty Gulch Chicago Tunnel <br /> December 2016 <br /> Cnpple Creek, fts Discharge"A" <br /> ulch Stream <br /> a Stream �� �! <br /> t 2"Deep � 04— <br /> ..n O/psBs !"'""uw Structure •. <br /> �on Mififi� i <br /> .: : <br /> le Fabric ,a <br /> _ qin <br /> Hydraulics <br /> ERC evaluated the hydraulics of the inlet channel (Structure #5), outlet channel (Structure#4) and pond <br /> spillway (Structure #6) using the peak flow data presented above and the design sizing as presented in <br /> Steffens' SEDCAD report supplemented by their SEDCAD map. Flow conditions and relevant sizing for the <br /> three structures are summarized below. <br /> Parameter Structure#5 Structure#6(Sediment Structure#4 <br /> Pond Spillway) <br /> (Inlet Channel) (Outlet Channel) <br /> 100-Year Flow 7.04 cfs 7.04 cfs (0 outflow in 43.26 cfs <br /> Steffens'Analysis) <br /> Slope 0.8% NA 1% <br /> Base Width NA (triangular) 5 feet 2 feet <br /> Side Slopes 3:1 2:1 2:1 <br /> Manning's n 0.031 NA 0.032 <br /> Steffens Calculated Dso 1.5 inches 6-inch rock included in 3 inches <br /> Armoring design <br /> Steffens Calculated 0.95 feet 0 1.73 <br /> Flow Depth <br /> 2 <br />