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Web page of the Soil & Water Conservation Society of Metro Halifax (SWCSMH)
- Customized Flow Controls
has several extensive systems available for advanced stormwater
treatment, and has been well known for its Hydro-Brakes, and its
Customized Flow Controls.
Vortechnics, Inc. state, "What
are your site's stormwater treatment criteria? If the list includes
high removal rates, minimal land consumption, low maintenance, and
cost-effectiveness, your BMP options have just been significantly
narrowed. A major advancement in oil and grit separator (OGS)
technology, the Vortechs Stormwater Treatment System efficiently
removes grit, contaminated sediments, heavy metals, and oily floating
pollutants from surface runoff. This innovative design combines two
unique treatment structures to eliminate turbulence within the system -
ensuring proper physical separation and capture of sediment and oils."
The technology seems to be
capable of achieving an 80% net TSS removal efficiency!! Extensive
testing in both the laboratory and in the field had produced a
comprehensive set of data describing the relationship between flow
rate, particle size, and removal efficiency.
- A 1999 case history at the DeLorme Publishing Company in Yarmouth, Maine. Interim results:
- The net removal efficiency for the 20-storm, 7-month period was approximately 80%.
- Vortechnics, Inc. generally uses the removal efficiency of 50
micron sediment in the laboratory as a basis for predicting system
performance in the field. The fact that the system achieved an observed
removal efficiency so close to the goal is evidence that the sizing
methodology is a reasonably accurate way to predict field performance.
The Vortechs Stormwater Teatment
System is constructed of precast concrete and features a compact,
below-grade profile. The system incorporates a combination of unique
treatment structures that efficiently remove pollutants from runoff at
rates up to 25 cfs without washing out. Larger flows are treated using
Vortechs Systems that are cast-in-place. With its proven performance
and low maintenance, the Vortechs System reduces site owners'
post-construction clean-out costs.
Features and Functions
The swirling motion created by the Vortechs
System's tangential inlet directs settleable solids toward the center
of this chamber. During peak storms, this structure dissipates
potentially disruptive flows. Sediment is caught in the swirling flow
path and settles back onto the pile after the storm event is over.
The center barrier traps floatables in the
oil chamber, even during clean-out. Unlike conventional oil traps that
lack flow controls and extra tank capacity, the Vortechs System is
highly resistant to flow surges.
Flow Control Chamber
As a storm event builds in intensity, the
low-flow control within the Vortechs System will cause the inlet pipe
to become submerged. This process floats oily pollutants up above the
inlet pipe, and out of the influent stream. Consequently, the Vortechs
System keeps captured pollutants inside the trap by reducing forces
which encourage resuspension and wash-out.
Vortechnics, Inc. state, "Vortechnics Hydro-Brakes provide you with a
convenient, practical tool to precisely limit flows in stormwater
management systems. When used as part of a Flow-Slipping strategy,
Hydro-Brakes eliminate combined sewer overflows and the environmental
hazards they create. Hydro-Brakes are also effective detention basin
outlet controls - more reliable and cost-effective because, at the same
flow rate, they provide openings up to four times larger than
non-vortexing "plug flow" regulators. Explore further in this site to
learn how Hydro-Brakes work, what separates them from the older
generation of hydro-brakes, and how to specify them for your next
Vortechnics, Inc. state, "The Vortechnics engineering design team
working closely with our hydraulics laboratory has developed flow rate
control technologies specifically for stormwater applications. These
Custom-designed outlet control structures
engineered to meet precise permit requirements and stormwater quantity
management regulations. These outlet controls incorporate staged
outlets, trash racks, undetained discharges such as underdrains and
even instrumentation (if necessary) to meet your specific needs.
Vortechnics Bypass Structure
The Vortechnics Bypass Structure
specifically designed for stormwater treatment systems, exceeds the
performance of standard manhole bypasses by providing for containment
of floatables and an extra long weir to improve bypass functionality.
The floatable containment feature of the bypass will greatly reduce the
loss of petroleum products and help eliminate oily sheens (a major
cause of permit violations). The long weir optimizes bypass
functionality by precisely regulating flows, which results in full
utilization of treatment system capacity."
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