The tunnel system for the Combined Sewer Overflow .Abatement Project
(CSOAP) for the City of Rochester, New York, requires numerous control
structures. Site 45 is the designated name and location of one such
control structure. It is located on the west bank of the Genesee River and
receives flow from the Lake Avenue Tunnel and the Tiger Carlisle Tunnel.
The Site 45 control structure performs three functions. First, it
contains a centrally located chamber which provides relief from waterhammer
and surge pressures that will occur in the tunnels as a result of
stormwater inflows. Second, if the inflow volume is great enough, the
structure provides overflow relief by directing excess stormwater to two
dropshafts which lead to the Genesee River below. Third, the structure
controls the rate of flow through two parallel conduits which cross over
to the east side of the Genesee River, and to additional structures located
downstream, including the Frank E. Van Lare Sewage Treatment Plant.
The control structure at Site 45 is designed to pass up to 375 cfs
across the Genesee River to the Van Lare Treatment Plant. Flows greater
than 375 cfs will exceed the capacity of the treatment plant and will be
directed via the overflow relief to the Genesee River. The design maximum
inflow to the Site 45 structure is 3000 cfs.
Control of the rate of flow to the sewage treatment plant will be
accomplished by means of control gates within the Site 45 structure. The
gate openings will be set automatically to pass a given flow with a range·
of head differences. These head differences are dependent on the water
surface elevation in the surge chamber within the structure and the head
required to establish a specific flow to the sewage treatment plant.
A model of the Site 45 structure was built at the St. Anthony Falls
Hydraulic Laboratory from drawings of the proposed structure supplied by
Harza Engineering Company (Dwg. 1330 HYD 4500 RJ). Figures 1 and 2 show
the plan and elevation of the structure obtained from these drawings.
Photographs of the model are shown in Photos 1 and 2. The details of the
specific parts of the model will be explained as the functions of the
various components are discussed.
Froude law scaling was used to establish dynamic similarity between
the model and prototype, as gravity is the dominant force producing motion.
The following expressions were used to convert the geometric, kinematic,
and dynamic quantities from the model to the prototype.
Killen, John M.; Wetzel, Joseph M..
Hydraulic Model Studies of The Lake Avenue Control Structure Site 45.
St. Anthony Falls Laboratory.
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