Storm Water Detention


Storm Water Detention systems are used to temporarily store precipitation runoff that exceeds a site’s allowable discharge rate and then releases it at a controlled rate over a period of time to keep the down stream flow conditions normal. In many urban areas, regulations have been implemented to ensure that a site’s post-development runoff is equal to or less then the site’s original pre-developed runoff capacity. This is being done to help prevent excess short term flooding on neighbouring properties or stormwater systems downstream.


Corrugated Steel Pipe (CSP) is an excellent choice in material for the fabrication of the subterrain storage chambers utilized in storing water runoff. The strength of steel combined with various coatings allowing for long term durability and service life. Fittings such as elbows, tees, risers and inlets/outlets make CSP an economical choice for designers. A CSP detention system provides a cost effective solution to manage stormwater and saves valuable land space allowing above ground use of the site.


DuroMaxx, steel-reinforced polyethylene (SRPE) pipe, is a reliable alternative option for building Storm Water Detention systems and infiltration applications. The combination of steel and plastic materials results in an extraordinarily strong and durable pipe that sets a new industry standard for deep burial and corrosive soil applications.


Underground stormwater detention allows for high volume runoff storage within a small footprint area. Storage structures made from Corrugated Steel Pipe (CSP) are buried underground, typically under a parking lot, road or other open land on the site. In urban areas, an underground storage system is preferable to a surface detention pond since ponds use up valuable real estate and can possibly pose other problems such as:

  • Attracting unwanted waterfowl
  • Attracting diseases carrying insects
  • Potential safety issues for humans

Detention systems have the ability to improve water quality by allowing solids and effluents to be filtered out of the system prior to reaching the end outlet.

Storm Water Detention systems should be inspected at regular intervals and maintained when necessary to ensure optimum performance. Riser sections complete with ladders allow access to the underground system.  To increase ease of maintenance, pre-treatment systems can be installed to remove sediment, trash and contaminates such as oil from incoming runoff.



CSP detention systems are easy to install using standard culvert installation methodologies. A wide variety of pre-manufactured components such as fittings, headers, risers and bulkheads along with straight sections of pipe are installed by simply following the layout drawings that are supplied with each system.


CSP detention systems are available in a variety of coatings with predicable service life to meet site specific project requirements. The proper selection of coating and steel thickness enables CSP to deliver in different environmental conditions and abrasion severity. Currently the available CSP coatings are:

  • Galvanized Z610
  • Aluminized Type II
  • Polymer Laminate


CSP detention systems can be configured in a variety of sizes, shapes, corrugation profiles, coatings and thicknesses. An almost unlimited variety of configurations can be arranged to meet site specific needs. Example layouts include straight line, L-shaped, rectangular and square to mention a few.