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• <br /> PROJECT: Riverside Business Park <br /> BY: KGH <br /> DATE: 6/14/2016 <br /> CHECKED BY: UK <br /> DATE: 8/26/2016 <br /> LAST UPDATE: 10/6/2016 <br /> PRELIMINARY OUTFALL CAPACITY&BACKWATER CALCS <br /> BACKWATER CALCULATION SHEET <br /> 100 Year Storm <br /> Linked to Pipe Sizing Spreadsheet(100YR) <br /> Lot 4 to Multiple Outfall <br /> 100 Barrel Entrance Entrance Exit Outlet Approach Bend Junction Exist. Grate `Min. Adjacent <br /> YR Pipe Barrel Barrel Velocity 1 TW Friction HGL Head Head Contr. Velocity Head Head HW Grate -HW Grate Ground <br /> Pipe Segment Q Length Diameter "n" Area Velocity Head Elev Loss Elev Loss Loss Elev Head Loss Loss Elev Elev Elev Elev Elev <br /> CB to CB (cfs) (ft) (in) Value (sqft) (fps) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (f1) (ft) (ft) <br /> Exist 24"Steel CBC 14.49 10 24 0.012 3.14 4.61 0.33 12.75 0.03 12.78 0.07 0.33 13.18 0.33 0.00 0.00 12.85 - - 12.85 14.7 <br /> outfall (Solid <br /> CB C(Solid Lid) CB B 14.49 220 24 0.012 3.14 4.61 0.33 12.85 0.76 13.61 0.07 0.33 14.01 0.33 0.00 0.00 13.68 - - 13.68 15.3 <br /> CB B CB A 14.49 245 24 0.012 3.14 4.61 0.33 13.68 0.85 14.53 0.07 0.33 14.93 0.00 0.00 0.00 14.93 - - 14.93 15.3 <br /> Notes: <br /> 1.Starting TW Elev=12.75'NAVD88(MHHW plus 1 ft)per Jane Zimmerman Email 8/30/2016. RM concurs&this is conservative. HE <br /> 2.Backwater elevation shall not exceed 4 inches in depth at its deepest point per Everett Stormwater Management Manual Section 6.4.1 <br /> Set minimum grate to allow 0.2'of clearance to prevent water on pavement. <br /> H:\21Cp\16\0D1 POE Riverside On-Call\SEQUESTERED\Amendment 1-Calcs CAD working PDFs\Hydraulic Calcs\Lot 4 to Multiple Outfall.xlsx <br />