online_culvert:   Hydraulic design of highway culverts by FHWA method

Reference

Hydraulic Design of Highway Culverts, HDS 5, Federal Highway Administration, September 1985.

HW/D TABLE:

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Table 1.  Ratio HW/D as a function of culvert diameter D and discharge Q for square edge with headwall (A).1
D
(in)		Q (cfs)
12346810203040608010020030040060080010002000300040006000800010000
120.6000.8971.2501.6602.6004.2206.400777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
18777.7770.5050.6250.7490.9561.2001.5103.790777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
24777.777777.777777.777777.7770.6200.7250.8491.4502.4003.650777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
30777.777777.777777.777777.777777.7770.5380.6150.9201.2401.6992.9304.750777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
36777.777777.777777.777777.777777.777777.777777.7770.6950.8951.1201.6202.3303.280777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
42777.777777.777777.777777.777777.777777.777777.7770.5710.7170.8501.1351.4851.9005.720777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
48777.777777.777777.777777.777777.777777.777777.777777.7770.5750.6800.8701.0801.3003.0805.990777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
54777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5800.7400.8711.0282.1003.7306.000777.777777.777777.777777.777777.777777.777777.777777.777777.777
60777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5100.6380.7500.8711.5302.5104.000777.777777.777777.777777.777777.777777.777777.777777.777777.777
66777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5580.6570.7501.2451.8752.7405.100777.777777.777777.777777.777777.777777.777777.777777.777
72777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5760.6601.0281.4331.9963.6005.800777.777777.777777.777777.777777.777777.777777.777
78777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5250.5900.9001.2001.6002.6854.250777.777777.777777.777777.777777.777777.777777.777
84777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5250.7901.0301.2962.0203.1004.470777.777777.777777.777777.777777.777777.777
90777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.7100.9351.1401.6802.4203.360777.777777.777777.777777.777777.777777.777
96777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6450.8210.9801.3501.9202.600777.777777.777777.777777.777777.777777.777
102777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6000.7500.9031.2051.6002.090777.777777.777777.777777.777777.777777.777
108777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5480.6780.8221.0701.3501.7505.000777.777777.777777.777777.777777.777
114777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5150.5480.7580.9901.2251.5204.000777.777777.777777.777777.777777.777
120777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5960.6980.8961.1001.3303.270777.777777.777777.777777.777777.777
126777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5960.6600.8401.0101.2002.7505.250777.777777.777777.777777.777
132777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5300.6220.7720.9251.1002.3004.380777.777777.777777.777777.777
138777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5750.7200.8561.0251.9983.5605.700777.777777.777777.777
144777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5400.6780.8000.9421.7503.0984.830777.777777.777777.777
150777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5150.6470.7600.8641.5752.6054.220777.777777.777777.777
156777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6180.7100.8201.2152.3003.459777.777777.777777.777
162777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5700.6750.7801.2802.0003.1005.750777.777777.777
168777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5490.6400.7371.1851.8202.6104.350777.777777.777
174777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5200.6200.7121.1201.6702.4004.370777.777777.777
180777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5000.5900.6701.3501.5002.1303.6706.020777.777
1 A value of 777.777 indicates a value out-of-range.

Table 2.  Ratio HW/D as a function of culvert diameter D and discharge Q for groove end with headwall (B).1
D
(in)		Q (cfs)
12346810203040608010020030040060080010002000300040006000800010000
120.5800.8551.1251.4402.1803.2205.000777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
18777.777777.7770.6090.7200.9001.1101.3802.990777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
24777.777777.777777.777777.7770.6000.7050.8061.2971.9902.900777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
30777.777777.777777.777777.777777.7770.5200.5900.8751.1241.4502.3503.750777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
36777.777777.777777.777777.777777.777777.777777.7770.6700.8551.0101.4451.5952.630777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
42777.777777.777777.777777.777777.777777.777777.7770.5570.6900.8171.0401.3081.6304.830777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
48777.777777.777777.777777.777777.777777.777777.777777.7770.5590.6540.8361.0001.1902.4804.502777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
54777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5600.7120.8400.9631.7832.9604.650777.777777.777777.777777.777777.777777.777777.777777.777777.777
60777.777777.777777.777777.777777.777777.777777.777777.777777.7770.4500.6210.7230.8401.3862.0903.160777.777777.777777.777777.777777.777777.777777.777777.777777.777
66777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5460.6400.7231.1361.6032.2033.950777.777777.777777.777777.777777.777777.777777.777777.777
72777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5630.6460.9631.2921.7002.8754.495777.777777.777777.777777.777777.777777.777777.777
78777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5100.5760.8581.1011.4102.2003.285777.777777.777777.777777.777777.777777.777777.777
84777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5100.7580.9651.1801.7102.5003.410777.777777.777777.777777.777777.777777.777
90777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6800.8851.0501.4552.0002.680777.777777.777777.777777.777777.777777.777
96777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6250.7820.9221.2251.6602.180777.777777.777777.777777.777777.777777.777
102777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5800.7240.8601.1001.4101.780777.777777.777777.777777.777777.777777.777
108777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5350.6570.7900.9801.2251.5103.820777.777777.777777.777777.777777.777
114777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.4970.5350.7350.9251.1101.3603.180777.777777.777777.777777.777777.777
120777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5770.6650.8521.0201.2052.610777.777777.777777.777777.777777.777
126777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5480.6400.8000.9491.1002.2094.007777.777777.777777.777777.777
132777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5200.5980.7490.8771.0151.9003.400777.777777.777777.777777.777
138777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5600.7000.8250.9571.6992.8014.490777.777777.777777.777
144777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5270.6560.7720.8921.5102.4803.700777.777777.777777.777
150777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.4970.6270.7300.8381.3952.1703.230777.777777.777777.777
156777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5980.6860.7901.1081.9002.798777.777777.777777.777
162777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5580.6560.7541.1701.7062.5004.490777.777777.777
168777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5320.6250.7081.0801.5802.1903.380777.777777.777
174777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5060.5980.6881.0381.4551.9962.385777.777777.777
180777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.4800.5790.6500.9721.3901.7992.9004.670777.777
1 A value of 777.777 indicates a value out-of-range.

Table 3.  Ratio HW/D as a function of culvert diameter D and discharge Q for groove end projecting (C).1
D
(in)		Q (cfs)
12346810203040608010020030040060080010002000300040006000800010000
120.5900.8601.1151.4502.2203.4205.500777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
18777.777777.7770.6150.7250.9051.1201.3603.120777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
24777.777777.777777.777777.7770.6050.7120.8121.2992.0803.010777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
30777.777777.777777.777777.777777.7770.5280.6000.8901.1451.4952.4203.950777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
36777.777777.777777.777777.777777.777777.777777.7770.6750.8581.0251.4201.9972.780777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
42777.777777.777777.777777.777777.777777.777777.7770.5600.6990.8201.0501.3121.6554.720777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
48777.777777.777777.777777.777777.777777.777777.777777.7770.5620.6630.8421.0051.1992.5804.995777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777
54777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5600.7200.8430.9721.8003.1005.000777.777777.777777.777777.777777.777777.777777.777777.777777.777
60777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5010.6250.7300.8431.3922.1753.360777.777777.777777.777777.777777.777777.777777.777777.777777.777
66777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5500.6430.7301.1501.6352.3404.240777.777777.777777.777777.777777.777777.777777.777777.777
72777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5700.6500.9721.2991.7423.0004.750777.777777.777777.777777.777777.777777.777777.777
78777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5150.5800.8601.1071.4352.2853.470777.777777.777777.777777.777777.777777.777777.777
84777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5150.7600.9721.1901.7322.6003.620777.777777.777777.777777.777777.777777.777
90777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6890.8921.0701.4802.0802.800777.777777.777777.777777.777777.777777.777
96777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6340.7920.9301.2301.6922.220777.777777.777777.777777.777777.777777.777
102777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5860.7300.8671.1081.4201.799777.777777.777777.777777.777777.777777.777
108777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5420.6620.7960.9901.2301.5254.120777.777777.777777.777777.777777.777
114777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5080.5420.7400.9331.2001.3703.320777.777777.777777.777777.777777.777
120777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5800.6780.8541.0301.2102.710777.777777.777777.777777.777777.777
126777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5500.6480.8050.9521.1102.2954.420777.777777.777777.777777.777
132777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5270.6070.7500.8881.0221.9353.590777.777777.777777.777777.777
138777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5700.7100.8300.9661.7122.9964.750777.777777.777777.777
144777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5320.6700.7800.8891.5252.5703.998777.777777.777777.777
150777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5080.6320.7380.8391.3992.2202.420777.777777.777777.777
156777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.6050.6940.7971.1181.9352.900777.777777.777777.777
162777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5680.6620.7611.1191.7502.6004.750777.777777.777
168777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5400.6350.7141.0991.6002.2083.540777.777777.777
174777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.5130.6020.7921.0451.4752.0252.570777.777777.777
180777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.777777.7770.4920.5850.6540.9881.4601.8203.0025.010777.777
1 A value of 777.777 indicates a value out-of-range.

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