The CDS Hydrodynamic Separator - Superior Stormwater Trash and Sediment Removal

How the CDS Hydrodynamic Separator Treats Stormwater

• Stormwater enters the CDS through one or multiple inlets and/or a grate inlet. 
• The inlet flume guides the treatment flow into the separation chamber where water velocities within the chamber create a swirling vortex.
• Water velocities in the swirl chamber continually shear debris off the treatment screen.
• The combination of swirl concentration and indirect screening force floatables and solids to the center of the separation chamber trapping 100% of floatables and neutrally buoyant debris larger than the screen aperture.
• Sediment settles into an isolated sump while floatables and neutrally buoyant pollutants are captured in the separation cylinder. All pollutants remain in these sections of the unit until they are removed during maintenance.
• Stormwater then moves under the hydrocarbon baffle, and the treated water exits the system. The baffle acts as a wall for hydrocarbon containment. It contains previously captured hydrocarbons and prevents the agitation of hydrocarbons when high-flows spill over the diversion weir.
• During high-intensity events, the internal diversion weir directs a portion of flows greater than the design storm around the treatment chamber and over an internal bypass weir.
• Treated stormwater exits the CDS via the outlet pipe.

CDS Hydrodynamic Separator Features and Benefits

The Contech Design Center

The Contech Design Center provides engineers unparalleled flexibility in the layout and configuration of a detention or infiltration storage system. Our latest release includes options previously unavailable in a free, web-based design tool:

• A 2D/3D design environment with high-resolution graphics, including BIM model output.
• The ability to import a PDF site plan and design a system to scale over the plan.
• Provide instant access to customized, project-specific drawings.
• Design multiple systems per project and save for future use.
• Digitally collaborate using the new “Project Collaboration” feature. Share your project easily with anyone through the new project management page.

Select CDS Certifications

• Washington Department of Ecology (GULD) - Pretreatment
• Canadian ISO 14034 Environmental Management – Environmental Technology Verified (ETV)
• California Statewide Trash Amendments Full Capture System Certified*

*The CDS System has been certified by the California State Water Resources Control Board as a Full Capture System provided that it is sized to treat the peak flow rate from the region specific 1-year, 1-hour design storm, or the peak flow capacity of the corresponding storm drain, whichever is less.

CDS Configurations

• Inline, offline, grate inlet, and drop inlet configurations available
• Internal and external peak bypass options are available

CDS Maintenance

• CDS provides unobstructed access to stored pollutants, making it easy to maintain.
• Maintaining a CDS is a simple process that can be easily accomplished using a vacuum truck, with no requirement to enter the unit.
• Contech has created a network of Certified Maintenance Providers to provide maintenance on stormwater BMP’s.