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CMP Detention and Infiltration

CMP Detention and InfiltrationMeet stormwater quantity and runoff reduction requirement

Our corrugated metal pipe (CMP) underground detention and infiltration systems can be sized and shaped to meet your site-specific needs. The versatile material provides almost limitless opportunities to match individual site while lowering site development costs.

Detention and Infiltration
Detention &
Infiltration
Detention

Contech CMP detention systems store stormwater runoff exceeding a site’s allowable discharge rate and release it slowly over time. Installed belowgrade, the systems maximize property usage and meet your specific water quantity requirements. CMP detention systems are available in all AASHTO M-36 Types.

Infiltration

CMP pipe and pipe-arch is available fully or partially perforated to meet your Low Impact Development (LID) requirements. Standard pipe-wall perforations (3/8” diameter holes meeting AASHTO M-36, Class 2) provide approximately 2.5% open area. Subsurface perforated CMP infiltration systems store stormwater runoff in the pipe and surrounding stone during a storm until it can be slowly released into the surrounding native soil.

Here's what CMP offers you:

Durability

  • Proven service life — Exceeds 100-years with proper specification that meets all AASHTO and ASTM pipe specifications
  • Handles fill heights in excess of 100 feet – steel gains strength from soil
  • 100% traceable material — maintains performance even when recycled
  • Homogenous material — eliminates failures due to stress cracks, shrinkage cracks and air voids
  • Various coatings available with predictable service life

Versatility

  • Wide range of shapes and sizes – round and pipe-arch in diameters from 6 to 144 inches
  • Variety of layouts – rectangular, L-shape and staggered cells are frequently used
  • Array of fittings – tees, wyes, elbow, saddle branches, manifolds, reducers and custom fabrication available

Sustainability

  • World’s most recycled content – can count towards LEED® credits
  • Requires less energy and materials to produce – lowers carbon footprint

Easy Installation and Maintenance

  • Flexible and forgiving during installation
  • Lightweight for easy handling
  • Quick assembly shortens site development time
  • Integrated outlet control structure eliminates need for downstream control structure
  • Manhole riser sections, complete with ladders facilitate any access and scheduled maintenance

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CMP Stormwater Detention Systems

CMP DetentionFlexible configurations and pipe coatings are adaptable to site-specific footprints and conditions. CMP detention systems store stormwater exceeding a site's allowable discharge rate and release it slowing over time. Installed belowgrade, the systems maximize property usage and meet your specific water quantity requirements. CMP detention systems are available in all AASHTO M-36 Types.

CMP Subsurface Infiltration Systems

CMP InfiltrationCMP and pipe arch is available fully or partially perforated to meet your Low Impact Development (LID) requirements. Standard pipe-wall perforations provide approximately 2.5% open area. CMP infiltration systems retain runoff in the pipe and surrounding stone until it can be slowly released into the surrounding native soil.

Bioretention with Perforated CMP

CMP BioretentionMake bioretention practical for sites with marginal soils by installing perforated CMP. Pipe networks can be configured to meet any size facility. Allows you to reduce the footprint and depth of the bioretention cells.

CMP for High Volume Applications

CMP for high volume applicationsCMP plate systems allow for high volume stormwater storage in small footprint areas. The systems are offered in a wide variety of shapes and sizes in both aluminum and galvanized steel. Full-pipe systems and three-sided structures with open bottoms can be used for infiltration.

CMP for Low Profile Applications

CMP for low profile applicationsWhen vertical space must be maximized, the CMP can be utilized in a pipe-arch shape. The low, wide pipe-arch design allows for greater storage in a shallow profile than typical round pipe without losing any structural integrity. Like our round pipe, pipe arch is produced in six wall thicknesses including 18, 16, 14, 12, 10 and 8 gage, which are available with either helical or annular corrugations.

CMP Infiltration Wells for Runoff Reduction

CMP Infiltration Wells for Runoff ReductionMeet LID requirements and eliminate the need for the extended detention basin. First, collect the site runoff using Slotted Drain™, which directs water into vertical lengths of perforated CMP. The vertical perforated CMP is long enough to penetrate a clay layer (if present) and infiltrate the stormwater into a highly permeable alluvial layer about 12’-14’ belowground.

CMP Detention Case Studies
City Center Regional Stormwater Facility
City Center Regional Stormwater FacilityMountlake Terrace, Washington
Super One Grocery Store
Super One Grocery StoreSuperior, Wisconsin
Southgate Building 3
Southgate Building 3San Bernardino, California
Long Beach City College
Long Beach City CollegeLong Beach, California
U.S. Post Office
U.S. Post OfficeHouston, Texas
University of Wisconsin - Stevens Point
Taylor Yard Transit Village
Taylor Yard Transit VillageLos Angeles, California
Stonefield Retail Center
Stonefield Retail CenterCharlottesville, Virginia
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