HomeMy Public PortalAbout366314Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
August 3, 2010
Mr. John MacKinnon, P.E.
Regulatory Specialist
Hydro International
94 Hutchins Drive
Portland, ME 04102
: Reg-U-Flo0 Vortex Flow Control Valve
Provisional Use Level (PUL) Approval within District
Dear Sir:
The Metropolitan St. Louis Sewer District (MSD) has reviewed your application regarding the
Reg-U-Flo0 Vortex Flow Control Valve for use as a stoimwater flow control device. MSD is
pleased to provide Provisional Use Level (PUL) approval for the Reg-U-Flo® Vortex Flow
Control Valve for use as a stolinwater flow control device, subject to the following conditions.
o The Reg-U-Flow 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 as
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
hydrograph.
O Project specific design calculations and maintenance plans furnished by Hydro
International must be included within the project's "Stolinwater Management Facilities
Report" prepared by the consulting engineer. All applicable elements of the design shall
comply with the "Reg-U-Flo® Vortex Flow Control Submittal to Metropolitan St. Louis
Sewer District Version 1.0," September 30, 2009.
O Project specific design calculations including a stage discharge curve corresponding to
each flow control valve provided must be included within the project's "Stoiiiiwater
Management Facilities Report" prepared by and sealed by the consulting Professional
Engineer licensed in the state of Missouri.
O 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.
o The manufacturer shall guarantee the Reg-U-Flo0 Vortex Flow Control Valve to be free
from defects in materials and workmanship for a period of twelve months following
MSD construction approval.
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