Culverts & Highway Drainage

Culverts

Corrugated plastic pipe is an ideal product to reline or replace other drainage materials that have deteriorated.

Used beneath roadways and even under railroad tracks, culverts are usually short in length with both ends of the pipe open to direct water. But they need to be strong to support overburden embankments and heavy traffic loads. Culverts often provide access to commercial developments, homes, farms or livestock facilities, or beneath haul roads used for mining or forestry.

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Proven & Accepted

Depending on the diameter, corrugated HDPE pipe meets or exceeds broadly accepted standards such as AASHTO M252 or M294 and ASTM F667, F, or F and is listed in the AREMA manual for use in railroad projects. Similarly, corrugated polypropylene pipe meets or exceeds the standards set by AASHTO M330 and/or ASTM F. Both Type C (corrugated interior) and Type S (smooth interior) are widely available. Corrugated plastic pipe is approved by most state Departments of Transportation, local municipalities, and regional agencies for use as culverts and in other storm drainage applications.

Corrugated HDPE is also an approved culvert material within CSA and BNQ standards in Canada.

Load Strength

Properly installed HDPE corrugated pipe can withstand AASHTO HS-25 loads with a minimum 1 ft (0.3 m) of cover for pipe up to 48-in diameter ( mm), or 2 ft (0.6 m) of cover for larger pipe diameters.

Highway Drainage

Corrugated plastic pipe has been used beneath Interstate highways for more than 30 years.

Besides culverts, common applications for highway drainage are median drains (between lanes on a divided highway) and edge drains (along the pavement edge). Median drains use larger pipe, usually without perforations, and collect water from surface flows and edge drains. Edge drains use small perforated pipe to drain runoff from beneath the pavement.

Typical Highway Construction

Culverts &#; Medium drains &#; Side drains &#; Cross drains &#; Storm drains

Excellent Hydraulics

Corrugated pipe with a smooth interior has excellent flow efficiencies, allowing sediment to be flushed out of the system while keeping drainage at capacity. With such excellent hydraulics, pipe can often be reduced by at least one diameter from its corrugated interior counterpart. This downsizing can reduce the pipe cost and allows for a narrower trench, which reduces excavation and backfill requirements and reduces installation costs.

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Proven & Accepted

Most state transportation departments, regional agencies, and local municipalities have approved corrugated plastic pipe for culverts, median and edge drains and other applications. HDPE corrugated pipe meets AASHTO M252 or M294, depending on the diameter. Most suppliers produce both a corrugated interior (Type C) and a smooth interior (Type S). The pipe is available with or without perforations. Generally, plain pipe is used for median drains. Pipe is available with a complete line of fittings and accessories and joint qualities, including watertight joints.

Load Strength

When installed in accordance to ASTM International D- or AASHTO Section 30, corrugated plastic pipe easily supports maximum highway loads (HS 25 traffic loads).

MaXpro smooth wall pipe is a superior
polypropylene pipe with a smooth interior
designed for gravity flow storm sewer
retention/ detention and other high capacity drainage applications.

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