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City of Ann Arbor SSWWEP - Citizens Advisory Committee Coordination — City of Ann Arbor

Sanitary backups overlaid onto hydraulic analyses

Posted by Joe Conen on 23 Mar, 2014
Category: No category

I thought that Murat's discussion of the hydraulic analyses performed on the sewer mains was very informative.
I believe I recall that the "target areas" were selected because those were areas with about half of the sewer backups.   I would like to see where backups have occurred in other parts of the city overlaid onto the maps, like the pre- and post- FDD maps.  I think we need this for two reasons: First we need to reality check that backups that occurred would be expected by the analysis. Second, we need to pay attention to those areas to be sure we don't overlook any locations where residual risk is too high.
I would imagine this is part of the plan, but I wanted to to be sure.
Let me know whether this can be accomplished.
Thanks
Joe

Comments

Nick Hutchinson on 24 Mar, 2014:

Joe, what you mention above is exactly part of the plan.  The modeling hasn't yet extended all the way into the neighborhoods yet, but it will soon.  This is critical for examining the issue of the risk of neighborhood basement backups.

Jim Osborn on 29 Mar, 2014:

I would also like to see, hopefully it is part of the "plan", what happens to the system during a heavy rain WITH the increased demands added by Scio Twp. and any other townships who are allowed to add to the system by the feds, (parts of Pittsfield) since I believe that the federal gov. paid for part of it with this stipulation, or requirement, that they be added. So, what does this added flow do BOTH to the overall plant capacity and to the pipeline carrying the "stuff" from Scio Twp to the WWTP?

Kathy Boris on 1 Apr, 2014:

I have the same question as Jim. Craig Hupy seemed to say that the added
flow that these townships were entitled to send our way had already been
factored in. Is this true? It seems unfortunate that these townships
that are entitled to add flow to our sanitary sewer system are generally to
the west of Ann Arbor. Their flow must cross the entire expanse of Ann
Arbor, through our aging sanitary sewer infrastructure, to get to the Waste
Water Treatment Plant which is located east of Ann Arbor.
kb