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$105M Sewer Plan Raises Concerns About Cahill Basin

The $11.5 million plan to route storm water flows from Cahill Park to the Milwaukee River is one part of a larger 15-year plan to protect the village for a 10-year storm, and with street ponding, a 100-year storm.

The proposal to turn the Cahill Park softball field , route: {:controller=>"articles", :action=>"show", :id=>"residents-react-to-cahill-storm-water-detention-basin"} -->into a storm water retention basin was the center of attention at a Wednesday night village meeting about the village's

Gordon E Lang September 21, 2012 at 05:57 PM
Listen to Whitefish Bay Engineer Dan Naze discuss the Cahil Basin and Sewer Plan. https://www.youtube.com/watch?v=GqwjncTc2YE&feature=plcp
Chris Hayes September 22, 2012 at 12:48 PM
Lateral Line - I live in the 1203 basin and of course I'm part of the $3000-$6000 science project. If lining/repair does not make a difference then the village plan is to make us install sump pumps. How is this fair to all living in 1203? Village needs to rethink this BAD plan, Time to move?
Bob McBride September 22, 2012 at 12:58 PM
Maybe it is time to move. That's something I've certainly considered. Not so much because of this project in particular, though.. Anyways, I seem to remember at one time hearing (and this may be addressed in Naze's discussion that Gordon has linked to above) that, regardless, we're eventually all going to have our laterals inspected and either lined or replaced. MMSD has put very tight restrictions on the amount of fresh water they're going to allow to infiltrate the sanitary sewer discharge we send downline to them. The sanitary sewer lateral project is the minimum we'll have to do. If it turns out that the amount of infiltration corrected in 1203 isn't of a degree consistent with meeting those limitations, they will then push for the disconnection of floor drains and installation of sump pumps (some folks have already gone ahead and done this on their own). So while you're, in a way, part of a "science project", everyone eventually will have to have their laterals dealt with. Some folks have already done this on their own as well. That's my understanding of it.
Bob McBride September 22, 2012 at 01:19 PM
Here's some other stuff to think about: 1) The cost of this project is being based on the current cost of money (i.e., borrowing interest rates), which is extremely low as, no doubt, everyone knows. This is a project with a 15 year lifespan with yearly re-evaluations and financing done incrementally. A fair assumption is that, over that 15 year span, interest rates are going to rise, effectively increasing the cost beyond current estimates. 2) In those areas where groundwater flooding is an issue (as opposed to basement flooding based primarily on sanitary sewer floor drain backup), anything that tightens up infiltration into the sanitary system (lateral lining/replacement - floor drain disconnection/installation of sump pumps) is going to effectively increase the amount of ground water flooding to the area. For whatever period of time elapses between actions to address the infiltration issues and actions to address storm sewer issues, those areas are actually going to be more vulnerable to storm water related flooding than they are currently - although by what degree is not possible to determine. When I asked what that period of time may be for those types of areas, I was told it could be 7-10 years.
MrPierre September 27, 2012 at 05:13 PM
I still see hundreds of downspouts connected to the sewer system, when will these people be required to disconnect these rainwater sources?

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