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The sedimentation tank exit channel is currently a replicate of the entrance channel. The entrance channel size is based on the constraint of not breaking up flocs. This constraint causes the exit channel to be much larger than is necessary. The exit channel should be designed based on the constraint that the head loss in the open channel must be very small compared with the head loss in the launder orifices. This constraint ensures that the flow is uniformly distributed between sedimentation tank bays. The most sophisticated solution algorithm could use the direct step method and incorporate the changing flow through the channel. A simpler solution that would be conservative would be a simple friction slope calculation using the Darcy Weisbach equation adopted for flow in a rectangular channel. The friction slope times the length of the channel can be compared with the head loss in the orifices.
Floc Hopper design
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Ben, Chris ~ Est. Completion Date 6/30
The floc hopper fits nicely under the sed tank entrance channel for small plants, but for larger plants that space is reduced since the entrance channel is larger. We need a design for the floc hopper that accounts for the changing geometry of the entrance channel. The floc hopper also needs MtA code.
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Ports between flocculator channels
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May, Lindsay
After consulting with engineer Wil Serrano, the ports between the flocculator channel need to be switched from the bottom of the tank to the top. From a structural perspective it is much better to be able to tie the walls together at the top of the wall.
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