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PROJECT: Riverside Business Park <br /> BY: KGH <br /> DATE: 9/1/2016 <br /> CHECKED BY: HK <br /> DATE: 9/1/2016 <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 2 to North Split flow between Lot 2 Outfall and Multiple Outfall <br /> 100 Barrel Entrance Entrance Exit Outlet Approach Bend Junction Exist. Grate `Min. Adjacent <br /> YR Pipe Barrel Barrel Velocity t 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) (ft) (ft) (ft) <br /> Lot 2 Outfall Lot 2 CB 4.43 10 15 0.012 1.23 3.61 0.20 12.75 0.04 12.79 0.04 0.20 13.03 0.00 0.00 0.00 13.03 - - 13.23 13.1 <br /> Exist. 15"Steel <br /> Exist. 18"Steel <br /> Outfall(Multiple Lot 2 7.21 10.00 15 0.012 1.77 4.08 0.26 12.75 0.04 12.79 0.05 0.26 13.10 0.00 0.00 0.00 13.10 - - 13.30 14.7 <br /> Outfalls) <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 /> H:\21Cp\16\001 POE Riverside On-Call\SEQUESTERED\Amendment 1-Calcs CAD working PDFs\Hydraulic Calcs\Lot 2 to North.xlsx <br />