Abandoned Pipe Guidelines
8-11 Abandoned Pipe Guidelines Abandoned pipes shall be removed, plugged per Standard Specification 7-08.3(4), or filled with controlled-density fill (CDF) […]
Pipe Design
This section presents pipe design alternatives. 8-10.1 Categories of Structural Materials: Rigid or Flexible Based upon material type, pipes can
Trenchless Techniques for Pipe Rehabilitation
Several rehabilitation methods are available that can restore structural integrity to the pipe system while minimally affecting roadway traffic. As
Pipe Rehabilitation: Trenchless Technology
Deteriorated pipes can affect the pipes’ structural integrity and lead to roadway failures and development of sinkholes. Pipe deterioration could
Pipe Classifications
This section examines the five primary categories of pipes used in WSDOT projects: drain pipe, underdrain pipe, culvert pipe, storm
Introduction to Pipe Classifications and Materials
WSDOT uses several types of pipe for highway construction activities. To simplify contract plan and specification preparation, pipes have been
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Introduction to Water Crossings
This chapter covers the design requirements for water crossings on state highways over fish-bearing waters, in addition to HEC-18, HEC-20,
Subsurface Drainage
Subsurface drainage is provided for control of groundwater encountered at highway locations. Groundwater, as distinguished from capillary water, is free
Pipe Materials for Storm Sewers
When designing a storm sewer network, the PEO shall review Chapter 8 (for pipe materials) and the list of acceptable