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Important operating and design features of the patented
V2B1 configuration are:
Low flow (treatment) storm events using center coriolus
pipe to withdraw clarified stormwater
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Provides overflow weir collection of
treated surface water during low flow treatment
events-
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Improves swirl distribution and
sedimentation efficiency.
High flow storm events
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Coriolus pipe vortex action draws off
floatables for containment by baffle wall in fIoatables
chamber
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Optional secondary storm pipe to
provide additional conveyance for high
flow.
Downstream hydraulics -
internal piping design adapted to the site
downstream hydraulics.
This provides optimum conditions for swirl
sedimentation.
Upstream
surcharge -
internal operating loss typically less than 0.5 ft during the
Design Storm.
Pipe
orientation
- inlet and outlet piping orientation readily adapted to
unusual site constraints and off-line
treatment.
Pumpout - sediment and fIoatables
pumpout is facilitated by the open geometry of both
chambers.
Manufacture and
Delivery -
manufactured and delivered by a local approved concrete
precaster
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Standard precast concrete manholes are
used for the sediment and fIoatables
chambers.
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Standard PVC pipe components are used
for the internal piping.
System Weight
--separate
sediment and fIoatables chambers reduces weight to be handled
by contractor.
Water QualIty Event (First Flush} Hydrology
Assumed for Pavement Washoff Process
▪ Intensity = 0.80 inches/hr . ▪
Peak Flow Rate (PFR) = 0.70 cfsl impervious
acre
▪ Runoff depth = 0.50 inches. ▪ Frequency =
4-6 events/yr (varies, see local weather station
data)
Sediment Removal
Efficiency | 
The V2B1 Stormwater Treatment System
provides primary treatment of stormwater using locally available
precast concrete manholes.