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catchBasin StormFilter™
Important: These guidelines should be used as a part of your site
stormwater plan.
Overview
The CatchBasin StormFilter™ (CBSF) consists of a multi-chamber
steel, concrete, or plastic catch basin unit that can contain up to
four StormFilter cartridges. The steel CBSF is offered both as a
standard and as a deep unit.
The CBSF is installed flush with the finished grade and is
applicable for both constrained lot and retrofit applications. It
can also be fitted with an inlet pipe for roof leaders or similar
applications.
The CBSF unit treats peak water quality design flows up to 0.13
cfs, coupled with an internal weir overflow capacity of 1.0 cfs for
the standard unit, and 1.8 cfs for the deep steel and concrete
units. Plastic units have an internal weir overflow capacity of 0.5
cfs.
Design Operation
The CBSF is installed as the primary receiver of runoff, similar
to a standard, grated catch basin. The steel and concrete CBSF
units have an H-20 rated, traffic bearing lid that allows the filter
to be installed in parking lots, and for all practical purposes,
takes up no land area. Plastic units can be used in landscaped
areas and for other non-traffic-bearing applications.
The CBSF consists of a sumped inlet chamber and a cartridge
chamber(s). Runoff enters the sumped inlet chamber either
by sheet flow from a paved surface or from an inlet pipe
discharging directly to the unit vault. The inlet chamber is
equipped with an internal baffle, which traps debris and floating
oil and grease, and an overflow weir. While in the inlet chamber,
heavier solids are allowed to settle into the deep sump, while
lighter solids and soluble pollutants are directed under the baffle
and into the cartridge chamber through a port between the
baffle and the overflow weir.
Stormwater Solutions from Contech
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OperatiOn and
Maintenance
Once in the cartridge chamber, polluted water ponds and
percolates horizontally through the media in the filter cartridges.
Treated water collects in the cartridge's center tube from where it
is directed by an under-drain manifold to the outlet pipe on the
downstream side of the overflow weir and discharged.
When flows into the CBSF exceed the water quality design
value, excess water spills over the overflow weir, bypassing the
cartridge bay, and discharges to the outlet pipe.
Applications
The CBSF is particularly useful where small flows are being
treated or for sites that are flat and have little available hydraulic
head to spare. The unit is ideal for applications in which
standard catch basins are to be used. Both water quality and
catchment issues can be resolved with the use of the CBSF.
Retro-Fit
The retrofit market has many possible applications for the CBSF.
The CBSF can be installed by replacing an existing catch basin
without having to "chase the grade," thus reducing the high cost
of re piping the storm system.
www.ContechES.com/stormwater
800-338-1122
© 2013 Contech Engineered Solutions
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