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11-11-13 Common Council Meeting Minutes
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11-11-13 Common Council Meeting Minutes
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City Council - City Clerk
City Council - Document Type
Council Mtg Minutes
City Counci - Date
11/11/2013
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REGULAR MEETING NOVEMBER 11,2013 <br /> waste. So we built some of interceptor sewers that would intercept that flow and take it to the <br /> wastewater treatment plant to be treated. But they did not built the treatment plant larger enough <br /> to handle all the flow, nor did they build the interceptor sewers larger enough to handle it, and so <br /> there are a number of occasions where we are overflowing into the river or even worse people's <br /> basements. So here's our motivation,we've got somewhere around 60 to 70 times on a typically <br /> year that we've got these overflow events and they could be as many as 36 different locations <br /> throughout the city,we've got 36 combined sewer overflows throughout the City of South Bend <br /> and somewhere between five hundred million to we had as much as 2 billion gallons a year of <br /> overflow from these combined sewer overflows during the year. Here's the other part of the <br /> motivation is keeping sewage out of basements. We still have a number of areas where <br /> basements are backing up, we simply looked at 3 distinct areas in town just to make sure we <br /> were still having issues with basement back-ups and 376 homes surveyed we had response from <br /> 225 that they were still having back-ups in their basements. Some of those were multiple times <br /> per year. Mr. Horvath referred to his power-point presentation. So here's a diagram showing <br /> roughly what combined sewer looks like and operates like on the left you can see under dry <br /> weather conditions the downspouts from buildings the storm lines from roads all these go into <br /> this combined pipe as does the sanitary sewage from our homes and from our businesses. Under <br /> dry conditions our pipes are big enough that they can handle all that flow and so it just continues <br /> to flow all the way to the treatment and we treat it there before discharging it back to the river. <br /> However, when we have wet weather, it rains our combined sewer starts to raise and at some <br /> point we have got bottle necks in our system that they start failing and so we get surcharging in <br /> those lines and that's when it backs up and either floods basements or overflows to the river. So <br /> our problem is as I mentioned we've got 36 of these along the river our city limits is <br /> approximately 40 square miles and our combined system is approximately 20 square miles. So <br /> one solution would be separating the entire city storm separate from sanitary and creating a <br /> bunch of storm sewers,unfortunately the cost of that program is well in excess of what our term <br /> control plan is. So now what I would like to do is maybe just have Becky talk a little bit about <br /> long term control plans. <br /> Councilmember Oliver Davis: How much rain does there have to be or how much snow does <br /> there have to be before it starts surcharging or backing up? <br /> Eric Horvath: That totally depends; I know that's not the answer you are looking for. The issue <br /> is that's its more about intensity and duration than it is about overall amount. <br /> Councilmember Oliver Davis: So the faster that it comes down? <br /> Eric Horvath: The faster it comes down the more we are going to have an overflow, so we can <br /> have a sprinkle over a couple days and not have an overflow when we get a good rain. You can <br /> see 60 to 70 days a year we have overflows. So imagine you know most rainfalls we are getting <br /> overflows. <br /> Councilmember Oliver Davis: And the same thing after the snow melts? <br /> Eric Horvath: Yeah, if you have a big snow melt, you can easily have an overflow as well. <br /> Becky Schaefer, Greeley and Hansen Engineers, 7820 Innovation Blvd., Suite 150, Indianapolis, <br /> Indiana, (referring to the power point) This slide shows the history of the development of South <br /> Bend's long term control plan. I won't get into the details, but it started back in 1989 and the <br /> city has invested a significant amount of money to study the system and bring together a bunch <br /> on information to develop this plan and they gotten input from several experts along the way and <br /> the plan has been through several iterations throughout time over the last twenty years. This <br /> table compares South Bend long term control plan to other long term control plans so the costs <br /> are listed and then the best way that we have found to compare plans is looking on how much <br /> combine sewer area you have in the City and the plan is basically is very dependent on the <br /> volume of combined sewage in the area and the land. So South Bend took the cost of the long <br /> term control plan per acre, combined acre in South Bend's mid-range. South Bend is in a <br /> Federal Consent Decree, a federal enforceable order; it was signed in December 2011. The <br /> element of the plan includes eliminating dry weather overflows; reducing wet weather overflows <br /> from 60-70 per year to 4 overflows per year and disinfecting those overflows so that water <br /> quality standards are met at the state line. There are a couple of ways that we can re-open the <br />
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