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DOT LogoMemorandum
U.S. Department of Transportation
Federal Highway Administration

Subject: ACTION: Distribution of HY-8 Culvert Hydraulic Analysis Program, version 7.2
Date: 08/18/09
From: /S/ Original signed by Jorge E. Pagan for
M. Myint Lwin, P.E., S.E.
Director, Office of Bridge Technology
In Reply Refer To:HIBT-20
To: Directors of Field Services
Division Administrators
Federal Lands Highway Division Engineers

The Office of Bridge Technology is pleased to announce the maintenance release of version 7.2 of the HY-8 Culvert Hydraulic Analysis Program (HY-8 7.2). HY-8 7.2 represents FHWA's multi-phase upgrade of our culvert hydraulics software approaches and protocols. The FHWA released the initial version of HY-8 program in the early 1980's.

HY-8 7.2 has on-line Help that assists users in the understanding software operations and features. The technical methods applied in HY-8 are based on the FHWA publications: "Hydraulic Design Series 5: Hydraulic Design of Highway Culverts" (HDS-5), May 2005 and "Hydraulic Engineering Circular 14: Hydraulic Design of Energy Dissipaters for Culverts and Channels" (HEC-14), Third Edition, July 2006.

Attached to this memorandum is a copy of a "HY-8 Quick Start" document that provides information on background; program downloading and installation; some important differences between older versions and HY-8 7.2; and ways to report bugs or other problems. A copy of this memorandum and attachment is being e-mailed directly to the hydraulics unit in each State department of transportation. Additionally, the HY-8 software and portable document format (PDF) versions of HDS-5 and HEC-14 are posted on the Office of Bridge Technology's Website at:

If you have any questions, please contact Mr. Joe Krolak of my staff at (202) 366-4611.


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Joe Krolak
Office of Bridges and Structures

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Updated: 04/07/2011

United States Department of Transportation - Federal Highway Administration