Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Changeover from joint sanitary/storm sewer to separate storm and sanitary lines.
By way of background, the street I live on was reconstructed a number of years ago. The former system was a combined storm and sanitary and now they are supposedly separate. To me the main difference I have noticed is that during periods of very heavy rain sometimes the water would back up a bit through the main cellar drain (which is at the low point of the cellar near the street) with the old system. Even with very heavy flooding rains it hasn't since the reconstruction.
For this reason I was surprised when a neighbor on the other side of the street had his cellar flooded with about 16 inches of sewer water, even though there wasn't even any rain that day, and the house itself hadn't been used(no one had been living there using water or sewer) for a number of years. The municipality admitted they had been working on a problem on an intersecting larger street at the time, which was apparently the cause of the back up.
I should point out that the cellar drains in my and my neighbor across the streets house (both about 100 years old) originally had some type of backflow preventer on those drains which was no longer functional. After what happened to him I put one on my drain, even though I haven't had any issues since the reconstruction.
It is hard to get information from the city, my neighbor has since died, even though I don't have the specifics of the situation on my particular street I thought maybe people on this site might give me some incite into the typical and the ideal situations in municipal plumbing.
First off I believe that before the reconstruction work that the main sewerline from the house and the line from the cellar drain entered the common sewer at different places, though I guess the cellar drain could have connected into the main drain before it emptied both into the street sewer at one point. Which arrangement would be typical? Assuming that the main house sewer and the cellar drain line were separate, when they created separate sewers for the sanitary and storm drainage would a cellar sewer typically be run into the sanitary sewer or the storm sewer , which would be ideal ?
My next question involves the connection with the intersecting street, which I believe has never been reconstructed and still has a joint storm/sanitary sewer. My assumption is that the city anticipates eventually reconstructing all the streets, and as it does creating separate storm and sanitary sewers so that the sewage treatment plant doesn't have to process all the rainwater, which can just got to the river. In the meantime though, the separate storm and sanitary lines on my street it would seem just end up being mixed back together when they flow into the larger intersecting street which has the old combined sewer. Would it be good practice or standard practice to put in some type of backflow preventer either at the intersection of these two streets drainage systems or maybe at the point on the reconstructed street where the cellar drains emptied into either the now separate sanitary or storm sewers? Is this ever done , always done, or just depend on the budget of the particular job? Any incites on this would be appreciated. Sorry for the lengthyness of this post.