Posted on 05/12/2017 12:50:48 PM PDT by Morgana
Time to buy a rowboat then.
This is because your house and everyone else’s is being used as a “vent” for the entire system.
A way to get around that is to at least install backwater valves in any basement fixtures instead if the piping configuration allows it.
I’ve done it on washing machine standpipes in basements to prevent backups flowing up and out of them.
Had a customer in a townhouse on the last end of the run before the septic system. System used to back up into their basement and everyone else’s would flow in on top of it.
The operating company finally replaced the system when the neighbors started getting the backflow instead.
A few hours later I was called back there as the excavator had trenched through both lines 😫
My boss was screaming at me. The lady whose house and Corvette was flooded with crap was screaming at me and the backhoe driver was doing a fair amount of screaming. All because the lines were not where I had marked them.
I showed my boss the as-builts, pointed at the manhole lids and said what was I suppose to do. My boss looked at things and said I was right.
The city paid the lady for her damages.
Ed
Not the same. Unfortunately.
We don’t have basements in South Florida the water table is to high. Most of us are on septic tanks so at worst you get a clog. Pump out the tank and your good to go. Drain fields last about 20 years.
Actually the main line is city property under the street, and a back-up due to a main line fault is resulting in flow into the residence waste line connection. With sufficient pressure head from higher elevation connections, there is flow into the residence. Pressure Jetting to clear main line blockages also sometimes results in residential flooding.
There is a version of an anti-flood valve with a ball float, which caps a low riser teed into the residential waste line outside the home. The ball float should be placed at the lowest point along the residential drain line; and, must be below the lowest drain connection within the home to provide protection from back flooding. It floods the yard instead of the residence.
High-rise apartment building in Hayward, Ca. with main connector line plugged—a torrent coming out of every fixture drain on the first floor. Hip-wader day for sure!
So you are talking about septic systems and we are talking about municipal sewers. Two different animals.
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