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Storm Drain improper connection Retrofit

Storm Drain improper connection Retrofit

(OP)
Hello Everyone!

I have a project at an automotive manufacturing facility. They've been experiencing flooding issues and we recently had the pipes scoped and videoed. There are numerous improper connections to the large diameter mainline which results in the connecting pipe protruding into the flow path, thus creating a physical barrier. See attached photo. The best option I know is to simply get in there are sawcut off the intrusive pipe. Does anyone have other ideas?
Thank you!

RE: Storm Drain improper connection Retrofit

Before you do anything find out first the reason for the pipe protusion. The intent may have been not to have back flow into the protruding pipe. When you do get to excavate to make the repairs, you may have to put in a junction box and reroute the protruding pipe in such a way so as not to have backflow into it.

RE: Storm Drain improper connection Retrofit

(OP)
Being familiar with the way construction happens out there, and the contractors doing it, and the lack of previous design process. I'm 99% positive the reason for the protrusion is that they cut a hole in the big pipe and stuffed a smaller pipe through, and called it a day.

That being said, my hydraulic models do show the majority of these systems to be pressurized in a 10 year storm event.

Thank you for your reply.

RE: Storm Drain improper connection Retrofit

if the main line is large enough, than get in there and cut them off. it will be confined space, so special safety requirements per OSHA. otherwise, cut off from the outside and pour a collar as is more typically done. or install a manhole / junction structure.

the protruding pipes will create some additional head loss, but are you sure that is what is causing the flooding?

RE: Storm Drain improper connection Retrofit

(OP)
CVG, that is pretty much what I was thinking.

These pipe protrusions are not the sole reason for the flooding issues. The large scale preliminary solutions are complicated and costly. The client is hoping to identify some 'quick fix' opportunities that could alleviate the problem, while demonstrating that some actions are being taken, while we figure out the best line of attack for some real fixes.

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