FHWA - CULVERT DESIGN - CECALC.com
36 L 2 d 2 u o H 2g V TW 2g V HW + = + + (6) HW o is the headwater depth above the outlet invert, m (ft) V u is the approach velocity, m/s (ft/s) TW is the tailwater depth above the outlet invert, m (ft)
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