What to do with Stormwater has been a question since ancient times. Today, there are many products to contain, convey, and manage stormwater for our new site developments. Site Supply has the knowledge and expertise to help you select the best products for the stormwater management needs of your project. We inventory storm pipe and associated components and can deliver to your job quickly.

Stormwater Management

There are many issues today associated with stormwater runoff from site developments, both during construction and after construction. Many of our urbanized areas have old Combined Sewer Overflow (CSO) infrastructure. Unfortunately, they are no longer appropriately sized to handle the sanitary and stormwater volumes created from today’s developments. The pipes in a CSO infrastructure are usually large enough to handle the everday flow of sanitary sewage. However, even when light rain occurs, they are not large enough to handle both the sanitary sewage and the stormwater volumes. Consequently, these CSOs backup and overflow into our streams, lakes and rivers, polluting our environment.

The National Pollutant Discharge Elimination System (NDPES) permit program was developed through the Clean Water Act by the United Stated Environmental Protection Agency (USEPA).  The purpose of the NDPES program is to control water pollution through elimination of point source discharges and the reduction of non-point source discharges.  In order to comply with the NDPES regulations, developers, designers and contractors are going to have to consider the wide range of stormwater detention, retention, infiltration, and filtration systems that are available.

Storm Pipe Detention System

These piping systems are typically fabricated from Corrugated Metal Pipe (CMP) or High Density Polyethylene Pipe (HDPE). They are formed into pipe manifolds, with runs of pipe leading to bulk-headed ends. There are inlet stubs to tie in the storm sewer piping. This piping extends from catch basin structures around the site, into the detention pipe manifold system. This way, all the stormwater is collected from the catch basins, conveyed through storm piping, and then detained in a detention pipe basin for volume control. An outlet control structure at one end of the detention pipe system is designed to release specified volumes of water over time that would match pre-development runoff rates. Perforated detention pipe systems are sometimes used to add storage capacity in the stone envelope around the detention pipes. This reduces the quantity of stormwater to be released by allowing some of the stormwater to infiltrate into the surrounding soils.

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