For more than 30 years, HDPE
pipe has been
successfully used in highway drainage. Most state Departments of Transportation, regional agencies, and local municipalities approved
corrugated pipe for median and
edge drains as well as for other applications. HDPE
corrugated pipe in highway drainage is often used as median drains (between lanes on a divided highway) or edge drains (along the pavement edge).
Median drains are larger pipes usually without perforations that collect flow from edge drains and surface flows. Edge drains are small perforated pipe
that drain the runoff from the pavement.
When installed in accordance to ASTM International
Corrugated Pipe easily supports
HS 25 traffic loads ( maximum highway loads). In fact,
pipe has been successfully used on Interstate Highways for many years.
Typical highway construction uses include medium drains, side drains, cross drains and storm drains.
Benefits of HDPE
corrugated pipe in highway drainage applications
- Proven and accepted - HDPE corrugated pipe meets AASHTO M252 or M294, depending on the diameter. Most suppliers produce both Type C (corrugated interior) and Type S (smooth interior). The pipe is available with or without perforations; generally plain pipe is used for median drains. Pipe is available with a range of joint qualities, including watertight joints.
- Versatile installations - Highway drainage applications vary so the pipe must supply a variety of features. HDPE corrugated pipe is available in a full range of diameters and with a full line of fittings and accessories to meet specific layout requirements. Pipes can be easily, quickly, and safely cut to length to meet potentially changing layouts. Installation is fast and equipment requirements are kept to a minimum. Disruption to traffic and local residents and businesses is reduced.
- Excellent hydraulics - Smooth interior pipe provides excellent flow efficiencies. Often, smooth interior pipe can be reduced by at least one diameter from its corrugated interior counterpart. Downsizing allows a narrower trench, which reduces excavation and backfill requirements helping to speed installation. The smooth interior also allows sediment to be flushed out of the system so that it maintains its capacity.