HY8:Tapered Inlet

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The improved inlet table shows the headwater elevation at the culvert inlet based on different controls such as the crest, face, and throat. The following parameters are computed and displayed:

  • Total Discharge: Total discharge at the culvert crossing
  • Culvert Discharge: Amount of discharge that passes through the culvert barrel(s)
  • Headwater Elevation: Computed headwater elevation at the inlet(s) of the culvert(s)
  • Inlet Control Depth: Inlet control headwater depth above inlet invert
  • Outlet Control Depth: Outlet control headwater depth above inlet invert
  • Flow Type: USGS flow type "Full Flow HDS-5" is shown if full flow outlet control option is selected
  • Crest Control Elevation: Headwater elevation calculated assuming crest control.
  • Face Control Elevation: Headwater elevation calculated assuming face control.
  • Throat Control Elevation: Headwater elevation calculated assuming throat control.
  • Tailwater Elevation: Tailwater elevation at culvert outlet from downstream channel.


The improved inlet table also provides the option of plotting and viewing the culvert performance curve.