A pavement sewer cleanout has a perimeter formed by sidewalls, and a sewer aperture at the center of the perimeter. A sewer surface is provided between form a path from the sidewalls to the sewer aperture. A circular protrusion is concentric with the sewer aperture and extends downwards from the sewer surface to engage with a sewer pipe.

In a drainage device for draining road surfaces, parking areas, roof surfaces or the like, comprising a trough body and filter material which is situated in the trough body and is intended for cleaning water loaded with solid particles and/or dissolved pollutants, the filter material is a constituent part of a filter device which has a plurality of filter elements which can be handled individually and, if required, can be removed from the trough body, which filter elements each have a water-permeable enveloping wall with the filter material situated within the enveloping wall.

An oil and grit separator system having twin vortex which uses gravity providing a twin vortex effect to remove sediment and oil from contaminated water. The system is designed to control storm water runoff and reduce the annual suspended solids loading of the granulometric particles. The conception and configuration of the system has a double action vortex. It ensures an optimal treatment level in either light or heavy rain and avoids re-suspension of particles. It also removes, separates and stores floating oil without any possible re-suspension of the matter.

An energy dissipator for use in a sumped manhole includes a sheet member. The sheet member defines a downstream surface, an upstream surface opposite the downstream surface, and opposing side edges each extending between the downstream surface and the upstream surface. The sheet member includes a plurality of apertures. Each of the plurality of apertures extends through both the downstream surface and the upstream surface. The sheet member extends in an arcuate manner between the opposing side edges. The dissipator is configured to intercept fluid flow within the manhole to decrease energy and control flow dynamics within the manhole.

A curb inlet filter adapted to work in conjunction with a curb inlet comprised of permeable filter fabric fashioned generally in a V cross section, comprising an upper and lower fabric layer separated by one or more gussets. A user inserts the curb inlet filter into a curb inlet and may apply pressure to push the filter into the curb inlet causing the gussets to compress as the invention enters the curb inlet and resulting in a press fit between the gussets supporting the upper and lower permeable filter fabric layers. The compression fit retains the inlet filter into place and the curb inlet. Water may pass through the permeable filter fabric, while the permeable filter fabric prevents sediment and other unwanted debris from entering the storm water drainage system.

A stormwater treatment device may include a chamber having a floor and a wall; an inlet formed in the wall that receives stormwater into an inlet side of the chamber; an outlet formed in the wall that discharges stormwater from an outlet side of the chamber; an enhanced settling device positioned in the outlet side of the chamber; a flow diverter plate in a lower portion of the chamber; and an outlet control diverter positioned proximate to the outlet. Stormwater is received by the inlet in a first flow direction, flows from the inlet side to the lower portion of the chamber in a second flow direction, flows through the enhanced settling device to an upper portion of the chamber in a third flow direction, flows through the outlet control diverter in fourth flow direction, and is discharged by the outlet in a fifth flow direction.