Hydraulic Design Series 4 - Introduction to Highway Hydraulics - Listing of Updates and Corrections

Sep 25, 2026

Hydraulic Design Series No. 4 introduces highway hydraulics with hydrologic techniques focused on small drainage areas and a review of core hydraulic concepts such as continuity, energy, momentum, hydrostatics, weir flow, and orifice flow. It then covers open channel flow principles and design, plus closed conduit principles and design applications including culverts and storm drains, supported by examples. The series addresses stable channel design, pavement drainage, energy dissipators, and concludes with construction, maintenance, and economic considerations.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages203

Reading Time8 h 32 min

AccessFree to download

Listing of Updates and Corrections (errata & corrigenda)

Page 4-43, Example Problem 4.8

Page 4-44, Example Problem 4.8

Publication and documentation notes

Technical Report Documentation Page

Report identification and dates

Abstract

Key words

Hydraulic Design Series 4 – “Introduction to Highway Hydraulics”Listing of Updates and Corrections (errata & corrigenda) | DATE | ACTION | BY | | --- | --- | --- | | 20 Aug 2012 | Page 4-43, Example Problem 4.8 (SI Units): sequent depth (y2) equation is incorrect (i.e. , “-1” is within the square root) . The proper form of the equation is:
y 2 = ~~ ~~0.332~~ ~~ 􀂧􀂨􀂩 ~~ ~~1+ 8(8.34)2 − 1􀂷􀂹􀂸 = 3.73 m The solution of 3.73 m is correct. | JSK | | 20 Aug 2012 | Page 4-43 , Example Problem 4.8 (English Units): velocities should be 54.7 ft/s (not 49 ft/s) on steep slope and 5.6 ft/s (not 5.51 ft/s) on mild slope:
“ …velocity on the steep slope were calculated to be 1.0 ft and 54.7 ft/s …”“ …the …velocity were calculated to be 9.71 ft and 5.6 ft/s …”
The figure depicting the steep slope to mild slope transition also lists the incorrect velocities. They should be using the correct velocities noted above.
Potential water surface profile 2 (S1)
Q = 875 ft3/s

Potential water surface profile 1 (M3)

V = 5.6 ft/s
Mild Slope
9.7 1 ft

The error is a result of conversion errors between the SI and English units within Example Problem 4.8. The SI version of the example has correct velocities. | JSK | | 20 Aug 2012 | Page 4-44, Example Problem 4.8 (English Units): The Froude equation uses the incorrect velocity (see above) . This results in an incorrect Froude value.
Using 54.7 ft/s , the correct Froude number equals 9.64. | JSK | | 20 Aug 2012 | Page 4-44, Example Problem 4.8 (English Units): sequent depth (y2) equation is incorrect (i.e. , “-1” is within the square root) . The proper form of the equation is:
y 2 = ~~ ~~12.0~~ ~~ 􀂨􀂧􀂩1+ 8(9.64)2 − 1􀂷􀂹􀂸 = 13.14 ft
As the correct solution is 13.14 ft, in the last paragraph of this section, the text should read “ …normal depth (i.e. , 13.14 > 9.71)…”.
The channel water surface still exhibits an M3 curve. | JSK | | | This list includes all known items as of Monday 20 August 2012 | | Notes: No update to the publication is planned at this time. FHWA does not have any printed copies of this document. NHI allows purchase of some FHWA documents. See the FHWA Hydraulics website to report any additional errata and corrigenda. Publication No. FHWA-NHI-08-090 June 2008 Hydraulic Design Series No. 4 Introduction to Highway Hydraulics Technical Report Documentation Page | 1. Report No.
FHWA-NHI-08-090 (HDS-4) | | 2. Government
Accession No. | 3. Recipient's Catalog No. | | | --- | --- | --- | --- | --- | | 4. Title and Subtitle
Introduction to Highway Hydraulics
Hydraulic Design Series Number 4, Fourth Edition | | | 5. Report Date
June 2008 | | | | | | 6. Performing Organization Code | | | 7. Author(s)
James D. Schall, Everett V. Richardson, and
Johnny L. Morris | | | 8. Performing Organization Report No. | | | 9. Performing Organization Name and Address
Ayres Associates Inc
3665 JFK Parkway, Bldg. 2, Suite 200
Fort Collins, Colorado 80525 | | | 10. Work Unit No. (TRAIS) | | | | | | 11. Contract or Grant No.
DTFH61-06-D-00010/T-06-00 | | | 12. Sponsoring Agency Name and Address
National Highway Institute (NHI) and
Office of Bridge Technology (HIBT)
Federal Highway Administration
Washington, D.C. 20590 | | | 13. Type of Report and Period Covered
Final Report (4th Edition) | | | | | | 14. Sponsoring Agency Code | | | 15. Supplementary Notes
Project Manager: Veronica Ghelardi
Technical Assistance: Jorge Pagán-Ortiz, Cynthia Nurmi, and Dan Ghere | | | | | | 16. Abstract
Hydraulic Design Series No. 4 provides an introduction to highway hydraulics. Hydrologic techniques presented concentrate on methods suitable to small areas, since many components of highway drainage (culverts, storm drains, ditches, etc.) service primarily small areas. A brief review of fundamental hydraulic concepts is provided, including continuity, energy, momentum, hydrostatics

FAQs

What topics does Hydraulic Design Series No. 4 cover?

It covers fundamental hydraulic concepts, open channel flow principles and design applications, and closed conduit principles including culverts and storm drains, supported by examples and an overview of energy dissipators.

Why were errata and corrigenda issued for Example Problem 4.8?

The corrections address incorrect equations, velocity values, and Froude calculations caused by conversion errors between SI and English units in Example Problem 4.8.

Who might benefit from this introductory hydraulic design material?

Designers and engineers needing an introduction to highway drainage facility design, especially those without extensive drainage training or experience.

Sep 25, 2026

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