Pipe discharge (Tables)EXCEL MACRO. "Pipe discharge rates" T. Popma July 1992APPROXIMATE DISCHARGE RATE FROM DRAIN PIPE FLOWING FULL(All cells with dark border MUST have entry; calculated discharge rate is displayed in shaded cells)CHARACTERISTICS OF PIPEDiameter (inches)3Length (ft)500Roughness Coefficient0.012(PVC=0.012; cast iron=0.015; concrete=0.017; corrugated metal=0.025)Number of bends1(90 degree bends with curve radius approx equal to pipe diameter)Head (ft)30(vertical distance from water to discharge)DISCHARGE RATE =0.23cfsor104gpmor0.46acre-ft/dayor7liters/secDISCHARGE RATES (CFS) FOR PVC DRAINS RUNNING FULL(Conversion: 1 CFS = 1.7 m3/ minute)(Assumes pipe has one 90-degree bend. Flow increases approx 2-8% with no bends,with greatest difference at shorter pipe lengths and higher diameters)PVC PIPE.DIAMETER2inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100010.0610.0470.0310.0230.0140.01020.0860.0660.0440.0320.0200.01430.1060.0810.0540.0390.0250.01840.1220.0940.0620.0450.0290.02050.1370.1050.0700.0500.0320.023100.1930.1480.0990.0710.0460.032150.2370.1810.1210.0870.0560.040200.2740.2090.1400.1010.0640.046300.3350.2560.1710.1230.0790.056500.4320.3310.2210.1590.1020.0721000.6120.4680.3120.2250.1440.102PVC PIPE.DIAMETER3inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100010.1640.1300.0900.0650.0420.03020.2320.1840.1270.0930.0600.04330.2840.2260.1550.1130.0730.05240.3280.2600.1790.1310.0840.06050.3670.2910.2000.1460.0940.067100.5190.4120.2830.2070.1340.095150.6350.5040.3470.2530.1640.116200.7340.5820.4010.2930.1890.134300.8980.7130.4910.3580.2310.165501.1600.9210.6340.4630.2990.2131001.6401.3020.8960.6540.4220.301PVC PIPE.DIAMETER4inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100010.3230.2650.1880.1390.0900.06520.4570.3740.2650.1960.1280.09130.5600.4590.3250.2400.1560.11240.6470.5300.3750.2780.1810.12950.7230.5920.4200.3100.2020.144101.0230.8370.5940.4390.2860.204151.2531.0250.7270.5380.3500.250201.4461.1840.8390.6210.4040.289301.7721.4501.0280.7600.4950.353502.2871.8721.3270.9810.6390.4561003.2342.6481.8771.3880.9030.645PVC PIPE.DIAMETER6inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100010.8280.7070.5250.3970.2630.18921.1701.0000.7430.5620.3720.26731.4341.2240.9100.6880.4560.32741.6551.4141.0500.7950.5260.37851.8511.5811.1740.8880.5880.423102.6172.2351.6611.2570.8320.598153.2052.7382.0341.5391.0190.732203.7013.1612.3491.7771.1760.845304.5333.8722.8762.1761.4411.035505.8524.9983.7132.8101.8601.3361008.2777.0695.2523.9732.6301.890PVC PIPE.DIAMETER8inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100011.5431.3651.0620.8250.5570.40422.1821.9301.5011.1660.7880.57132.6722.3641.8391.4280.9650.69943.0862.7302.1231.6491.1140.80753.4503.0522.3741.8441.2460.902104.8794.3163.3572.6071.7621.276155.9765.2864.1123.1932.1581.563206.9006.1044.7483.6872.4911.805308.4517.4765.8154.5163.0512.2105010.9109.6517.5075.8303.9392.85310015.42913.64810.6178.2455.5714.035PVC PIPE.DIAMETER10inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100012.5022.2631.8201.4440.9940.72523.5383.2002.5742.0421.4061.02634.3333.9203.1532.5011.7221.25645.0044.5263.6402.8881.9881.45155.5945.0604.0703.2292.2221.622107.9127.1565.7564.5673.1432.294159.6908.7647.0495.5933.8492.8102011.18910.1208.1406.4594.4453.2443013.70412.3959.9697.9105.4443.9735017.69116.00212.87110.2127.0285.129PVC PIPE.DIAMETER12inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100013.6923.3952.8052.2691.5901.16925.2224.8013.9673.2092.2481.65336.3955.8804.8593.9302.7532.02547.3856.7895.6104.5383.1792.33858.2577.5916.2725.0733.5542.6141011.67610.7358.8717.1755.0273.6971514.30113.14710.8648.7876.1564.5282016.51315.18112.54510.1477.1095.2283020.22418.59315.36412.4278.7066.4035026.10924.00319.83516.04311.2408.267PVC PIPE.DIAMETER15inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100015.9105.5294.7153.9102.8092.09028.3597.8196.6695.5303.9732.956310.2379.5768.1676.7724.8663.620411.82111.0589.4317.8205.6184.180513.21612.36310.5448.7436.2824.6741018.69017.48414.91112.3658.8846.6101522.89121.41318.26315.14310.8808.0952026.43224.72621.08817.48612.5639.3483032.37230.28325.82721.41615.38711.4495041.79339.09533.34327.64819.86414.780PVC PIPE.DIAMETER18inchesLENGTH OF PIPE (FT)HEAD (FT)2040100200500100018.6455.6844.9654.2043.0912.326212.2268.0397.0225.9454.3713.290314.9749.8458.6007.2815.3544.029417.29011.3689.9308.4076.1824.652519.33112.71011.1029.4006.9125.2021027.33817.97515.70113.2939.7747.3561533.48222.01519.22916.28111.9719.0092038.66225.42122.20418.79913.82310.4033047.35131.13427.19523.02416.93012.7415061.13040.19335.10829.72421.85616.449

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