HomeMy Public PortalAbout389022Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
Apri18, 2011
Jeff Clarke
Hydro -Kinetics Corp.
5741 Manchester Ave.
St. Louis, MO 63110
RE: Hydrovex VHV Vortex Flow Regulator
Provisional Use Level (PUL) Approval within the District
Dear Jeff,
The Metropolitan St. Louis Sewer District (MSD) has reviewed your application
regarding the Hydrovex VHV Vortex Flow Regulator for use as a stormwater flow
control device. MSD is pleased to provide Provisional Use Level (PUL) approval for the
Hydrovex VHW Flow Regulator for use as a stormwater flow control device, subject to
the following conditions.
• The VHV Vortex Flow Regulator device may be used in flood protection
(Qp) and channel protection (Cp) detention basin outlet structures. When
used for Cp, routing must show that the 24-hour extended detention is
provided. The 24 hour extended detention is defined providing a 24 hour
lag time (T) for the one year 24 hour rain event. "T" is defined as the
interval of time between the centroid of the inflow and the centroid of the
outflow hydropgraph.
• Project specific design calculations and maintenance plans furnished by
Hydro -Kinetics Corp. must be included within the project's "Stormwater
Management Facilities Report" prepared by the consulting engineer. All
applicable elements for the design shall comply with the "VHV Vortex Flow
Regulator Submittal to Metropolitan St. Louis Sewer District December 7,
2010.
• Proper access shall be provided to each location to ensure proper
maintenance and inspection of the flow control valve. The minimum size
access hole is 30 inches in diameter. All proprietary lids and covers should
be captive components.
• The manufacturer shall guarantee the Hydrovex VHV Vortex Flow
Regulator to be free from defects in materials and workmanship for a period
of twelve months following MSD construction approval.
• Flow regulators shall be protected from sediment build-up during and after
construction. A trash rack will be required for orifices 8 inches and smaller.
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