The City of Rochester plans to excavate the Culver-Goodman tunnel and
connect it to the existing Cross-Irondequoit tunnel through a control
structure which will limit the flow diverted for treatment to about 1050
cfs. A 16 ft diameter entrance tunnel with a round to square transition at
the downstream end conveys the incoming flow to a distribution chamber.
The original design, Type A, distribution chamber is 100 ft long by 76 ft
wide, contains 1:1 side slopes, blocks at the upstream end to dissipate
some of the energy of the incoming flow, and an ogee crested weir at the
downstream end. The floor of the distribution chamber is at elevation 285
ft and the weir crest at elevation 315 ft. Six sluices each 5 ft x 2.5 ft
direct the diverted flow downward into the drop chamber. To enter the
sluices the incoming flow has to make a 90 degree turn. The 100 ft long by
20 ft wide drop chamber also turns the flow 90 degrees towards the 12 ft
diameter exit tunnel. The drop chamber is required to be of sufficient
size to dissipate the energy of the falling water and to reduce the flow
velocity so that the entrained air in the water-air mixture can rise to the
surface and escape. Blocks at the downstream end assist in this process.
The floor of the drop chamber is at elevation 216 ft and the top is open to
the ground surface. A transition at the entrance to the exit tunnel guides
the flow smoothly into the tunnel.
Division Of Pure Waters; Harza Engineering Company; Lozier Engineers Inc.
Wetzel, Joseph M.; Dahlin, Warren Q..
Culver-Goodman Tunnel Control Structure Model Studies.
St. Anthony Falls Laboratory.
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