SUMMARY OF WORKSHOP SESSION ON MISCELLANEOUS DRAINAGE CONSIDERATIONS--PORTLAND, OREGON
This paper summarizes the work session on miscellaneous drainage considerations held at the 1973 Federal Highway Administration workshop on Water in Pavements in Portland, Oregon. All states had similar geometric requirements and specifications on slopes and grades. There was considerable discussion on frost affects on pavements. Washington uses a 10-in. (25.4-cm) slotted pipe on the upper side of a section of superelevated curve to carry away snowmelt water. The state has established frost depths for their geographic areas, and each project is handled on an individual basis. Alaska uses moss, brush, and other natural materials, in addition to manufactured insulation products, to prevent thawing of their subgrades. Oregon designs to half-of-the-frost-depth with free-draining materials in their frost areas. All states agreed that it is virtually impossible to prevent water from entering the pavement section and that more effort should be put into designing, constructing, and maintaining better drainage facilities.
- This paper was presented at a 1973 workshop on Water in Pavements sponsored by the Federal Highway Administration, held in Portland, Oregon.
Washington, DC United States 20590
- Gregg, C J
- Publication Date: 1973
- Pagination: p. 335-336
- TRT Terms: Construction; Design; Drainage; Drainage practices; Drainage structures; Frost action; Geometric design; Highway curves; Highway grades; Insulating materials; Maintenance; Pavements; Slopes; Snowmelt; Subdrains; Subgrade (Pavements); Subsurface drainage; Superelevation; Water; Workshops
- Geographic Terms: Alaska; Oregon; Washington (State)
- Subject Areas: Construction; Design; Highways; Hydraulics and Hydrology; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I26: Water Run-off - Freeze-thaw;
- Accession Number: 00792284
- Record Type: Publication
- Files: TRIS, USDOT
- Created Date: May 7 2000 12:00AM