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Sweeping is a storm water BMP and a common pollution prevention technique to remove pollutants before they enter the storm water system. Some local governments have storm water requirements for debris handling after it has been collected, such as designated dump areas or ground-dumping restrictions. In the case of ground-dumping restrictions, container or truck dumping can be an effective solution.
Dumping Into A Container
Dumping into a roll-off container keeps pollutants from potentially contaminating storm water. All of the pollutants are contained and transported to be disposed of in a safe location. Another benefit of dumping into containers is eliminating double-handling of debris; scooping it off of the ground and transporting it for disposal. Dumping into containers also allows the operation to dump on-site.
Dumping Into A Dump Truck
Dumping into a dump truck is another effective method that eliminates ground dumping and potential stormwater contamination. It also affords the opportunity to dump on-site, rather than transporting to a designated dump site.
Catch Basin Screens
The general purpose of catch basic filtration is to keep street level contaminants from entering the storm sewer system and causing storm water pollution. Catch basin devices differ significantly in their ability to capture small particles and in their holding capacity. The most commonly used versions filter trash from storm water runoff and other water runoffs and have a capacity of a few hundred pounds. Catch basin devices act as a last chance removal BMP, best used in conjunction with street sweepers.
What is it?
A catch basin screens is essentially a large, coarse screen that can be placed at the opening of the catch basins at street level, or installed inside of the catch basin. The screens are constructed of a noncorrosive metal such as stainless steel. Catch basins with flow restrictors don’t effectively remove pollutants by themselves (EPA.gov) but can be used in conjunction with other practices.
How does it work?
During intense weather events, catch basin covers act like a large colander – they prevent larger debris from entering the sewers with storm water. To maintain catch basin inserts, a combination sewer cleaner such as a Vactor can be utilized to remove collected material from the trap.
How does it fight pollution?
Normally, storm water is naturally filtered through soil before it reenters the water system. Paved surfaces however, block storm water from being filtered. Storm water usually gets piped to the nearest body of water along with all the surface pollutants like oil drips, brake dust, litter and other water pollution. Porous pavement, or pervious pavement, is a special type of Portland cement concrete or asphalt concrete that is porous and allows water to pass through it. Paving bricks may also be used, but oftentimes the water and storm water passes through the permeable course sand that is between the bricks. Regardless of the top surface type, all pervious pavement types intended for storm water control are designed to allow water to pass through the top surface, then store and begin to filter the storm water in some type of collection bed under the top surface layer. The stored storm water can be absorbed directly back into the soil, virtually eliminating storm water runoff.
The key to success with porous pavement is to keep the pores open. It’s imperative to avoid sealing the pavement with nonporous sealants and to keep the pavement free of debris.
Cleaning the pavement with just the nozzle from a high-powered, pure vacuum sweeper three or four times a year usually does the trick.
Porous pavement varies depending on your local climate, so talk to a specialist in your area. Additional maintenance and restoration information is available via our Porous Pavement White Paper, but is only intended to be a recommendation as every application is different.
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