Strange hole in basement floor


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Old 11-20-18, 09:45 AM
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Strange hole in basement floor

Hello all, first post. I recently purchased a new home and I have a strange hole in my basement floor. Iím hoping someone can tell me what it is and what I can do about it because Iíd like to finish the basement but this is in the way. The hole is in the front of the house, about 6 inch diameter. When dry it was about 6-8 inches deep and muddy. After we got a lot of rain the hole filled up to the top but never overflowed. The sump pump is located about 20 feet away at the back of the house and is a sump jet system, works great. The basement is dry except for one crack about 5ft long that weeps with heavy rain, located about 10 feet away from the hole. Some people have told me this mysterious hole is an old drain but the hole looks rather fresh and the house was built in 1958. Originally a cape that was converted into a colonial, second floor was added 25 yrs ago. Iíd like to fill the hole in if possible. Thank you in advance!
 
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Old 11-20-18, 10:56 AM
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It could be almost anything. Since you are there you'll have to be the investigator. Have you tried digging in the hole to see if there is a pipe or clean-out fitting down there?
 
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Old 11-20-18, 03:02 PM
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There is no pipe or grate, just a raw hole in the floor, after probing itís just mud, cannot feel a bottom. Currently full of water so I canít see how large the cavity is.

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Last edited by PJmax; 11-20-18 at 03:46 PM. Reason: enlarged picture
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Old 11-20-18, 03:47 PM
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How far down did you go ?
It would be good to identify the depth of the hole. Use a broom handle.

There should not be any water in that hole if you have a sump and pump. Water in that hole means water under the foundation and can put a stop to finishing the basement.
 
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Old 11-22-18, 07:47 AM
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The hole is exactly 5 inches wide, concrete is 2 inches thick. After using a stick to measure it was a total of 15 inches deep. From the top of the hole to the silt was about 6 inches then 9 inches of heavy packed down silt. Water level is currently about 4 inches, been the same for a couple weeks now. Over the last 2 months Iíve seen it almost dry to filled all the way up with water. It definitely goes up and down depending on the rain.
 
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Old 11-22-18, 08:28 AM
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Some municipalities used to require a gate valve in the main sewer service line to prevent backups in case of sewer overload due to high inflow or clogging downstream. I know my uncle's house, built in the early 60's, had such a gate valve installed, with the handle in a recess just below the surface of the concrete floor. But since you can probe down 15" and not hit anything restrictive, such as a metal valve or line, I'm not sure what to say. Have you asked any of your neighbors if they have a similar hole in their basement floors, or have you considered going back to your realtor and asking them to contact the former owners, to see if they know anything about it?
 
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Old 11-22-18, 10:24 AM
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My neighbor told me when I moved in that there used to be a lot of water problems/flooding in the basement years ago. He installed a sump jet system for the previous owner and said that took care of all the problems. I havenít been able to catch him to ask about the hole. Thereís also an old shared well between my house and my other neighbor. Itís no longer connected as itís city water now. It looks like the water softener system was next to the sump pump years ago. I donít know if this has any relation or not but thought Iíd mention it. Also a steady stream of water is constantly running into the sump. The sump comes on every 5 minutes and runs for 30 seconds all day long.
 
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Old 11-22-18, 11:45 AM
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The sump comes on every 5 minutes and runs for 30 seconds all day long.
That sounds like an extremely wet area or highly saturated ground.
I can envision problems with fixing up the basement.
 
 

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