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  2. Culvert - Wikipedia

    en.wikipedia.org/wiki/Culvert

    Culverts can be constructed of a variety of materials including cast-in-place or precast concrete (reinforced or non-reinforced), galvanized steel, aluminum, or plastic (typically high-density polyethylene). Two or more materials may be combined to form composite structures. For example, open-bottom corrugated steel structures are often built ...

  3. HDPE pipe - Wikipedia

    en.wikipedia.org/wiki/HDPE_pipe

    HDPE pipe is a type of flexible plastic pipe used to transfer fluids and gases.It is often employed for replacing aging concrete or steel main pipelines.Constructed from the thermoplastic HDPE (high-density polyethylene), it has low permeability and robust molecular bonding, making it suitable for high-pressure pipelines.

  4. Headwall - Wikipedia

    en.wikipedia.org/wiki/Headwall

    Headwall and corrie lake Cwm Idwal. In physical geography and geology, the headwall of a glacial cirque is its highest cliff.The term has been more broadly used to describe similar geomorphic features of non-glacial origin consisting of a concave depression with convergent slopes typically of 65 percent or greater forming the upper end of a drainage valley.

  5. St. Alban's Bay Culvert - Wikipedia

    en.wikipedia.org/wiki/St._Alban's_Bay_Culvert

    The St. Alban's Bay Culvert is a historic bridge in Garrison Township, Minnesota, United States. It carries the four-lane U.S. Route 169 (US 169) over the head of a stream flowing out of Mille Lacs Lake. It was built from 1938 to 1939 as part of a major New Deal project to create a scenic parkway along the lakeshore.

  6. Ductile iron pipe - Wikipedia

    en.wikipedia.org/wiki/Ductile_iron_pipe

    Polyurethane is a thermosetting plastic with no solvents, with a three-dimensionally linked molecular structure giving it mechanical stability. The polyurethane lining used for internal coating has the following standard properties is standardised by EN 15655:2009 (Ductile iron pipes, fittings and accessories – Internal polyurethane lining ...

  7. Controlled low strength material - Wikipedia

    en.wikipedia.org/wiki/Controlled_low_strength...

    Several states have noted that metal or plastic pipes tend to float unless anchored, and some states have reported some resistance to the use of the material by contractors or engineers. Since flowable fill is normally a comparatively low-strength material, there are no strict quality requirements for fly ash used in flowable fill or controlled ...