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Home My WebLink AboutLimelite Renton - Backwater Analysis - 100 Year RationalBACKWATER ANALYSIS Project Name:Renton Shortplat Designed By: Henry Stefan Checked By: Peter Apostol Job Number: 14011 Storm Event:100-YEAR Rational Method Conveyance System Information Outlet Control Inlet Control Headwater Summation Overtopping Check Pipe Segment Surface Total Length Pipe "n" Down- Down- Up- Up- Pipe Barrel Barrel Critical Critical TW TW Barrel Friction Entrance Entrance Entrance Exit Outlet Inlet Inlet Control Approach Bend Bend Q1 Q3 V1 Junction Head HW (HW - Rim) Over- CB/MH # CB/MH # Flow Flow L Size value Stream Stream Stream Stream Slope Velocity Velocity Depth Depth Elev. Check Hyd. Loss HGL Ke Head Head Control Control Control HW Veloctiy Kb Head Head Loss Elev. Clearance topping Down Up Q Qtot D Invert Rim Invert Rim Head Ratio Rad. Elev. Loss Loss Elev.HW/D Elev. Elev. Head Loss Loss Total Check CFS CFS FT IN FT FT FT FT % FPS FT FT FT FT FT FT FT FT FT FT FT FT FT FT FT CFS CFS FPS FT FT FT FT CB #00 CB #01 0.70 4.31 66.0 12 0.012 467.06 472.14 467.39 472.59 0.50% 5.49 0.47 0.66 0.66 468.06 468.06 0.25 0.82 468.88 0.50 0.23 0.47 469.58 1.00 468.39 469.58 0.33 1.33 0.62 3.61 0.36 5.49 0.04 0.66 469.91 -2.68 Okay CB #01 CB #02 0.33 3.61 62.0 12 0.012 467.39 472.59 467.70 472.70 0.50% 4.60 0.33 0.60 0.60 469.91 469.91 0.25 0.54 470.45 0.50 0.16 0.33 470.94 0.93 468.63 470.94 0.27 0.02 0.01 3.28 4.60 0.01 470.68 -2.02 Okay CB #02 CB #03 0.96 3.28 100.0 12 0.012 467.70 472.70 468.20 473.20 0.50% 4.18 0.27 0.58 0.58 470.68 470.68 0.25 0.72 471.40 0.50 0.14 0.27 471.81 0.85 469.05 471.81 0.14 0.02 0.01 2.32 4.18 0.01 471.68 -1.52 Okay CB #03 CB #04 0.90 2.32 130.0 12 0.012 468.20 473.20 468.85 473.85 0.50% 2.95 0.14 0.06 0.47 471.68 471.68 0.25 0.47 472.14 0.50 0.07 0.14 472.35 0.68 469.53 472.35 0.05 0.02 0.00 1.41 2.95 0.00 472.30 -1.55 Okay CB #04 CB #05 1.21 1.41 155.0 12 0.012 468.85 473.85 469.63 476.60 0.50% 1.80 0.05 0.06 0.36 472.30 472.30 0.25 0.21 472.51 0.50 0.03 0.05 472.58 0.55 470.18 472.58 0.00 0.62 0.03 0.20 0.63 1.80 0.05 0.08 472.66 -3.94 Okay CB #05 CB #06 0.00 0.20 15.0 12 0.012 469.63 476.60 469.93 479.15 2.00% 0.25 0.00 0.06 0.15 472.66 472.66 0.25 0.00 472.66 0.50 0.00 0.00 472.66 0.10 470.03 472.66 0.00 0.62 0.00 0.20 0.25 0.00 472.66 -6.49 Okay CB #06 CB #07 0.00 0.20 144.0 12 0.012 473.73 479.15 475.17 479.81 1.00% 0.25 0.00 0.06 0.15 472.66 474.31 0.25 0.00 476.17 0.50 0.00 0.00 476.17 0.10 475.27 476.17 0.00 0.62 0.00 0.20 0.25 0.00 476.17 -3.64 Okay CB #07 CB #08 0.17 0.20 45.0 12 0.012 477.30 479.81 477.75 480.61 1.00% 0.25 0.00 0.06 0.13 476.17 477.87 0.25 0.00 478.75 0.50 0.00 0.00 478.75 0.10 477.85 478.75 0.00 0.21 0.00 0.03 0.25 0.00 478.75 -1.86 Okay CB #08 CB #09 0.03 0.03 174.0 12 0.012 477.75 480.61 480.40 482.81 1.52% 0.04 0.00 0.06 0.06 478.75 478.75 0.25 0.00 481.40 0.50 0.00 0.00 481.40 0.10 480.50 481.40 0.21 0.00 0.00 0.04 0.00 481.40 -1.41 Okay 481.40 coterra ENGINEERING PLLC collaborative civil engineering + site development + infrastructure design 14011 Backwater Analysis - Rational Method.xls 8/18/2016 CONVEYANCE INPUTS AND LAYOUT DATA Project Name:Limelite Short Plat Event Parameters: Runoff Coefficients: Job Number:14011 Event PR aR bR Tc iR IR C impervious 0.90 Designed By:MEB in unitless unitless min unitless in/hr C pervious 0.25 25-yr, 24-hr 3.4 2.66 0.65 10.4 0.58 1.97 100-yr, 24-hr 3.9 2.61 0.63 10.4 0.60 2.33 CB CB Impervious Pervious Total Total C IR, 25-yr Q25-yr Q25-yr IR,100-yr Q100-yr Q100-yr Downstream Upstream Area Area Area Area Surface Total Surface Total sf sf sf ac unitless in/hr cfs cfs in/hr cfs cfs CB #00 CB #01 11,707 9,966 21,673 0.50 0.60 1.97 0.59 3.65 2.33 0.70 4.31 CB #01 CB #02 5,449 5,213 10,662 0.24 0.58 1.97 0.28 3.06 2.33 0.33 3.61 CB #02 CB #03 10,769 33,404 44,173 1.01 0.41 1.97 0.82 2.78 2.33 0.96 3.28 CB #03 CB #04 11,745 25,451 37,196 0.85 0.46 1.97 0.77 1.97 2.33 0.90 2.32 CB #04 CB #05 20,117 18,445 38,562 0.89 0.59 1.97 1.03 1.20 2.33 1.21 1.41 CB #05 CB #06 0 0 0 0.00 0.00 1.97 0.00 0.17 2.33 0.00 0.20 CB #06 CB #07 0 0 0 0.00 0.00 1.97 0.00 0.17 2.33 0.00 0.20 CB #07 CB #08 2,952 2,114 5,066 0.12 0.63 1.97 0.14 0.17 2.33 0.17 0.20 CB #08 CB #09 469 484 953 0.02 0.57 1.97 0.02 0.02 2.33 0.03 0.03 coterra collaborative civil engineering + site development + infrastructure design ENGINEERING PLLC