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U.S. Department of Transportation
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202-366-4000

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Home / Programs / Bridges & Structures / Hydraulics / Culvert Hydraulics



HY-8 CULVERT HYDRAULIC ANALYSIS PROGRAM

HY-8 automates culvert hydraulic computations utilizing a number of essential
features that make culvert analysis and design easier. An HY-8 User Manual is
included with the software installation (access via 'Help' button on top
toolbar) to provide important information on the technical features,
capabilities, and limitations of the software.


SYSTEM COMPATIBILITY

HY-8 is a 64-bit program, and only compatible with 64-bit Windows-based
operating systems. When installing HY-8, make sure you have permissions on your
computer to install programs (usually this requires administrator permissions or
a username and password for an administrator account). If you do not have
administrator permissions on your account, you need to right-click on the
installation program and select the "Run as Administrator" option.

HY-8 has been updated to improve 508 compliance. The program can now be
navigated with the keyboard with increased menu tools and navigation. Each
dialog was reviewed for keyboard navigation. The documentation has been updated
to follow 508 compliance by using formatting, style sets, and alternate text for
images. The report generator was updated to use style sets.


DOWNLOAD AGREEMENT

By downloading the software, users acknowledge that they have read and agree to
the following conditions:

 * The application of this software is the responsibility of the user. It is
   imperative that the responsible designer understands the potential accuracy
   limitations of the program results, independently cross checks those results
   with other methods, and examines the reasonableness of the results with
   engineering knowledge and experience.
 * There are no expressed or implied warranties.

I agree to these conditions when downloading the software.


REPORTING ISSUES

If you believe you have found an issue with any version of HY-8 (including
installation errors, calculation errors, interface problems, confusing
functions, errors and omissions in the User Manual, and anything else that might
impact the functionality and usability of the software), please submit the
following information to Dave Claman (david.claman@dot.gov):

 * Name
 * Contact info (this won't be used unless there is a question about your HY-8
   issue)
 * Computer operating system (Windows 8, Windows Vista, etc.)
 * Complete description of each issue
 * PLEASE attach the HY-8 project file (.hy8) that demonstrates the issue
 * Also consider attaching a screen shot of the HY-8 window if applicable

HY-8 VERSION 8.0.0

Build date: May 29, 2024.Download HY-8 Version 8.0.0 (.zip, 140 mb)

Improvements made to this version of the software include the following:

 * Implemented new feature: Alternative culvert design analysis.
 * Bugfix for hydraulic jumps with improper stationing when stationing is
   decreasing.
 * Bugfix WSP profile selection
 * Bugfix with the report generator using the wrong index
 * Implement feature request to modify the page orientation, margin size, and
   line spacing of generated reports.
 * Implement the "Project Headwater Summary Table" report element.
 * Added HW/D to the Culvert Barrel Summary
 * Added "Essential Data Report" Format.
 * Bugfix for unit conversion on USBR VI stilling basin energy dissipator.
 * Bugfix for the wrong Manning's n value being used in full flow in certain
   circumstances.
 * Bugfix for losing the constant roadway elevation.
 * Bugfix for iterating on very small flows.
 * Bugfix for issue selecting a user-defined shape with embedment.
 * Bugfix for embedded user-defined culverts losing points and display in
   front-view plot.
 * Bugfix for broken-back culvert data not refreshing with changes.
 * Bugfix for units and computations with elliptical and pipe-arch culverts.
 * Implemented feature request for a note in energy dissipation that we have
   culvert protection methods in the Hydraulic Toolbox.
 * Bugfix for interpolation method in determining the inlet control depth.
 * Bugfix for different water surface profile data when comparing the same
   culvert with different stationing values.
 * Bugfix to handle changes in virtual earth.
 * Bugfix for column headings swapped in report.
 * Bugfix for depressed culvert being applied to a broken-back culvert.
 * Bugfix for designing energy dissipation with a SAF basin that did not
   converge.
 * Improved the USGS Flow Type chart

HY-8 VERSION 7.80.2

Build date: November 29, 2022. Download HY-8 Version 7.80.2 (.zip, 137 mb)

Bugs addressed:
 * Addressed a low flow channel calculation in the AOP module causing a crash.
 * Adjusted the display of the selected profile instead of defaulting to the
   overtopping profile.
 * Fixed the display of the question mark (?) icon for the user’s manual, which
   did not appear in the Energy Dissipation module for some screen resolutions.
 * Addressed metric rating curves being compared to the invert elevation before
   being converted.
 * Fixed issue with report generation failing on names with quotes (‘ or “) in
   the name.
 * Fixed issue where roadway crest was modified when saved and read from a file.
 * Fixed issue where the diameter on an embedded circular culvert was lost when
   saved and read from a file.
 * Fixed issue where the wrong flow area was computed for a given depth.
 * Fixed incorrect area of pipe arch listed for display.
 * Fixed incorrect geometry for a pipe arch.
 * Improved iteration success rate to 99.8% in testing most problematic cases; a
   failure caused a decrease in HW with increased discharge. This problem was
   resolved.
 * Fixed issue where selecting an inlet edge type caused HY-8 to crash.
 * Fixed issue where duplicating a culvert barrel on a crossing with multiple
   discharges crashed.
 * Modified HY-8 to not allow the user to try (and fail) to generate a report
   where the filename exists and is locked.
 * Adjusted some language in the user’s manual.
 * Fixed minor issues in the Bridge scour combo boxes.

HY-8 VERSION 7.70.2

Build date: April 12, 2022. Download HY-8 Version 7.70.2 (.zip, 150 mb)

Bug fixes include:

 * Corrected the Froude Number for energy dissipator calculations to use
   hydraulic depth instead of hydraulic radius.
 * Corrected an issue with a specific multiple culvert barrel calculation.
 * Corrected an issue with flow area calculations in the 'water surface profile
   data dialog for embedded circular culverts.

HY-8 VERSION 7.70

Build date: June 2, 2021. Download HY-8 Version 7.70 (.zip, 153 mb)

Improvements made to this version of the software include the following:

 * Added a secondary versioning number.
 * Updated the Quick Start Guide.
 * Upgraded the interface for high pixel density displays and updated interface
   icons.
 * Upgraded to a new library to export data to the report generator with
   Microsoft Word format (DOCX).
 * Added an option to set default unit system, outlet control, and exit loss.
 * Added irregular roadway plot minimum and maximum crest elevations in the side
   view.
 * Increased the number of irregular roadway plot points from 15 to 5000.
 * Added Manning’s n value and plot of critical depth in the tailwater channel.
 * Added feedback to the user when irregular tailwater channel is insufficient
   for the specified flow.
 * Improved HY-8 tailwater computations to better handle surcharge situations.
 * Added culvert size on the results page.
 * Added Ke value of the inlet edge types and the culvert barrel slope in the
   Edit Crossing window.
 * Added max shear stress to the AOP table.
 * Provided testing information to the user in the HY-8 User’s manual.

Bug fixes include:

 * issue with runtime error report
 * discontinuity in reported outlet control depth
 * toggles in performance table with “all on” or “all off” commands
 * error when exporting report
 * issue with tailwater depths and unreasonable computation time
 * internal testing issue
 * issues with images not being removed and project notes not being cleared
 * issue of anomaly when exporting a report
 * issue of embedment not being exported in the report
 * issue with file size increasing with each read and save cycle
 * issue with computing the Froude Number in the energy dissipation module
 * issue where HY-8 stops running on some machines
 * issue with entering negative tailwater elevation
 * issue with adversely sloped outlet control culvert flowing full instead of
   following a drawdown curve
 * issue with Performance curve plot in SI units
 * issue with ‘Root was not bracketed’
 * issue with double broken-back culvert not completing the water surface
   profile and providing a false outlet velocity
 * ‘Define Roadway Stations’ crash
 * HY-8 handling of negative stationing with a broken-back culvert
 * issue with Ke values not being applied properly
 * issue with embedded plots when saving and changing the inlet

HY-8 VERSION 7.60

 * Build Date July 30, 2019. This version does not include new features, but
   rather: 1) corrects computational issues with embedded circular culverts, 2)
   fixes many reported bugs, 3) improves computational stability, and 4) updates
   the user interface. The HY-8 User’s Manual included with the software package
   (available by selecting “HY-8 Help” in the “Help” drop-down menu) describes
   the corrections to the embedded circular culvert logic in Section 4.1,
   Embedment Depth. Please email Eric Brown (eric.r.brown@dot.gov) if you want
   additional details on the implemented corrections to embedded circular
   culverts and a complete list of maintenance items implemented in Version
   7.60.
   * Download HY-8 Version 7.60 (.zip, 88 mb)

HY-8 VERSION 7.50

 * Build Date July 28, 2016. This version contains two new calculators: a) a
   calculator to assist with the FHWA's culvert aquatic organism passage (AOP)
   design procedure, which is described in detail within Hydraulic Engineering
   Circular 26, "Culvert Design for Aquatic Organism Passage, First Edition"
   (HEC-26), and b) a calculator to determine the variation in cross-sectional
   flow velocity from the culvert wall to the centerline, which is described
   within Research Publication No. FHWA-HRT-14-064, "Fish Passage in Large
   Culverts with Low Flows".
   
   Improvements made to this version of the software include: corrections to the
   AOP calculator, a correction to the calculation of roadway overtopping for
   various scenarios, a correction to the calculation of composite Manning's n
   values for user defined shapes, edits to the Saint Anthony Falls (SAF) Energy
   Dissipator routine, and edits to the Riprap Basin Dissipator routine.
   * Download HY-8 Version 7.50 (.zip, 87 mb)


EMAIL NOTIFICATIONS

 * Sign up to receive Hydraulics email notifications


MORE INFORMATION

 * HDS 5
 * HEC 14
 * Report a bug
 * An Introduction to the FHWA HY-8 Culvert Hydraulic Analysis Program (video)


CONTACTS

 * David Claman
   Resource Center
   515-357-1284
   E-mail David
   


Updated: 07/01/2024
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Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC
20590 | 202-366-4000