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Culvert Design: 

Culvert Selection - Box
  • Calculate the initial trial culvert size for the design of a box culvert.
Culvert Selection - Round
  • Calculate the initial trial culvert size for the design of a round shaped culvert.
Culvert Selection - Other
  • Calculate the initial trial culvert size for any shape culvert, inculding culvert shapes other than box and round.
HW - Submerged Inlet - IC
  • Calculate the headwater depth (HW) for a culvert under inlet control (IC) with a submerged inlet.
HW - Unsubmerged Inlet - IC
  • Calculate the headwater depth (HW) for a culvert under inlet control (IC) with and unsubmerged inlet.
Round Culvert - Head - OC
  • Calculate the head (H) for a round culvert under outlet control (OC).
Arch Pipe - Head - OC
  • Calculate the head (H) for an arch pipe culvert under outlet control (OC).
Square Box - Head - OC
  • Calculate the head (H) for square box culvert under outlet control (OC).
Rectangle Box - Head - OC
  • Calculate the head (H) for rectangle box culvert under outlet control (OC).
Any Shape - Head - OChape - Head - OC
  • Calculate the head (H) for any culvert with any cross section shape under outlet control (OC).
HW Depth - Outlet Control
  • Calculate the headwater depth (HW) of a culvert under outlet control (OC).  Requires that the head (H) be calculated first by one of the above calculations.
Culvert Outlet Velocity
  • Calculate the outlet velocity of a culvert.
Culvert Design Problem 1
  • Size a concrete culvert pipe crossing under a county road for the following design conditions: Q = 35 cfs; maximum headwater elevation is 104.6; upstream flowline elevation is 100.1; downstream flowline elevation is 99.7; culvert length is 58 ft and the culvert will project from fill with no headwalls.