I just recently moved into a home about three weeks ago. I live in Oregon so we get a considerable amount of rain each year. After a couple of weeks I noticed that water was flowing from the ground about 3 feet away from the end of the garage. Upon further inspection I noticed that there was a cement cap on top of about a 1' to 1.5' diameter, 4' deep cement well that was filled with water and was slowly filling up and spilling onto the drive way.
I thought it may have been a leak in the mainline to the house but I turned the water off at the street and it was still flowing over the top. I was able to look down the pipe and couldn't see any pipes leading into this concret well type structure. I'm just not sure what this could be. Has anyone ever encountered anything like this? I looked into french drains and dry wells but it seems to small to be anything of that sort..