skip to main content
culvert flow calculator following FWHA method, culvert hydraulics, hydraulic design of highway culverts, Victor Miguel Ponce, Rosa D. Aguilar, San Diego State University


online_culvert:   Hydraulic design of highway culverts by FHWA method

Reference

Hydraulic Design of Highway Culverts, HDS 5, Federal Highway Administration,
Third Edition, 2012.

INPUT DATA:

[Description]       [Sample input]       [HW/D Tables]

Units:   

[U.S. units] (SI units)

Type of Culvert:   

Discharge Q [cfs] (m3/s):   

Inlet invert elevation z1 [ft] (m):   

Manning's n:   

Bottom slope So:   

Tailwater depth above outlet invert y2 [ft] (m):

Culvert length L [ft] (m):   

Shoulder elevation Es [ft] (m):   

Freeboard Fb [ft] (m):   

Entrance loss coefficient Ke:   

Exit loss coefficient KE:   

OUTPUT:

Please enter input data and press 'Calculate'.

             

  Your request was processed at  07:39:45 am on January 9th, 2026   [ 260109  07:39:45 ].

Thank you for running online_culvert   [150914]

Count Clock 

Documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view; download Adobe Acrobat Reader.