Federal Highway Administration

HEC-15 Design of Roadside Channels with Flexible Linings

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Title/edition from FHWA Highway Drainage publications list (HEC-15 3rd ed., September 2005). Extractor had used the 1975 first-edition date. Manual focuses on channel lining shear stress design, not water-quality volume or specified hydrologic software.

Fields not found in document: document_metadata.document_title, document_metadata.version_or_edition, document_metadata.last_revised_date, design_criteria.water_quality_volume_method, design_criteria.required_hydrologic_hydraulic_software

Other federal manuals: HDS-4 Introduction to Highway Hydraulics, HEC-14 Hydraulic Design of Energy Dissipators for Culverts and Channels, 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

“FHWA (1998) provides detailed design guidance for selecting geotextiles as a riprap filter material.”
6.4.3 Riprap Filter Design, page 109

State

Not found in document

No evidence cited

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

“The manual was dated October 1975.”
document scope (not in excerpt body)

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“The design method presented in this circular is based on the concept of maximum permissible tractive force.”
Chapter 2: Design Concepts, page 27

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year

“Design flow rates for permanent roadside and median drainage channel linings usually have a 5 or 10-year return period. A lower return period flow is allowable if a transitional lining is to be used, typically the mean annual storm (approximately a 2-year return period, i.e., 50 percent probability of occurrence in a year).”
2.3.1 Design Discharge Frequency, pages 33-33

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

Manning's equation combined with the continuity equation for normal flow depth at design discharge

“The condition of uniform flow in a channel at a known discharge is computed using the Manning's equation combined with the continuity equation:”
2.1.2 Normal Flow Depth, page 27

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

vegetation, rock riprap, wire-enclosed riprap (gabions), turf reinforcement mats, erosion control blankets, gravel mulch, composite linings, rigid linings (concrete, asphaltic concrete)

“Vegetative linings consist of seeded or sodded grasses placed in and along the channel”
1.4.1.1 Vegetation, page 17