Federal Highway Administration

HDS-4 Introduction to Highway Hydraulics

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Title/edition corrected from FHWA Highway Drainage publications list (HDS-4, June 2008). Extractor had labeled this HEC-22 because HDS-4 cites that circular. Design storm return periods reflect typical state highway agency practice cited in the manual, not a single FHWA-mandated frequency. No explicit water quality volume method or approved BMP category list in supplied hydrology excerpts.

Fields not found in document: document_metadata.version_or_edition, document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, document_metadata.relationship_to_state_manual, design_criteria.water_quality_volume_method, design_criteria.approved_bmp_categories

Other federal manuals: HEC-14 Hydraulic Design of Energy Dissipators for Culverts and Channels, HEC-15 Design of Roadside Channels with Flexible Linings, HEC-21 Design of Bridge Deck Drainage, HEC-22 Urban Drainage Design Manual, HEC-24 Highway Stormwater Pump Station Design

Document Metadata

Jurisdiction level

Federal

“a single seven-parameter regression equation was developed for nationwide application”
page 39, Section 2.6.3

State

Not found in document

No evidence cited

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

Not found in document

No evidence cited

Design Criteria

Design storm return periods (years)

10-year, 50-year

“Most state highway agencies consider a 10-year frequency storm as the minimum for design of storm drains. Storm drains in sag locations are typically checked for the 50-year frequency storm.”
page 141, Section 8.2.2 Pipe Sizing

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

Rational Method, regional regression equations, statistical analysis of gaged streamflow data, rainfall intensity-duration-frequency (IDF) analysis, USGS rural regression equations, USGS urban regression equations

“When gaged data are not available, estimates are made by empirical equations (e.g., Rational Method) or by regional regression equations.”
page 27, Section 2.2 STORM RUNOFF

Hydrologic/hydraulic software

National Streamflow Statistics (NSS) program, HEC-RAS, HY-8

“the USGS compiled all statewide and metropolitan area regression equations into a computer program titled the National Streamflow Statistics (NSS) program.”
page 39, Section 2.6.4

Approved BMP categories

Not found in document

No evidence cited