The City of Rochester, New York, is developing the Combined Sewer
Overflow Abatement Program (CSOAP) to handle sanitary sewage and storm
water. The system includes many conventional dropshafts which transport
the water collected in surface conduits to the storage and conveyance tunnels
at a lower elevation beneath the ground surface. At several locations
where surge shafts are near conventional dropshafts the two structures are
combined. These combined surge and dropshaft structures have a dual purpose
of conveying water from the ground level to the underground tunnels
and relieving surge pressures in the system. Located throughout the system
are control structures to regulate and divert the flow as required. One of
these structures is designated as control structure 46 (CS46).
The structure is to be located near the Van Lare treatment plant at
the end of the three-mile long siphon tunnel. This is also the downstream
terminus of the 22 mile tunnel system. The. primary purpose of the
structure is to raise flows coming in through the siphon tunnel and direct
them to. a distribution structure at the head of the Van Lare treatment
plant. The configuration of the structure in this siphon mode is intended
to maximize the transport of sediment entering through the siphon tunnel,
up the siphon riser, and through the bifurcation structure. Since it will
be difficult to remove all the sediment in the siphon mode, the structure
will be operated in the flushing mode. In this mode, supercritical flows
will pass straight through the structure and enter a tunnel to the
Cross:Irondequoit pumping station. The effectiveness of the structure in
transporting sediment is one of the major concerns in the operation of
Dahlin, Warren Q.; Wetzel, Joseph M.; Parker, Gary.
Rochester Control Structure 46 Siphon Riser Structure Model Studies.
St. Anthony Falls Laboratory.
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