Re: Sewer oddity
Date: April 22, 2013 12:36AM
I know it is a few years since the original posting, but I also wanted to weigh in on the structure. As said above, a catch basin takes water from your sinks, bath tubs, laundry and utility sinks. (This structure should never take human waste.) There should be a minimum of two pipes that are visible in a catch basin, although we owned a home in the 1200 block of W. Oakdale that also had a second inlet line that ran from the garage (similar to the rear building mentioned above); the 6" pipe that drops back into the private drain (PD/ also known as a "lateral" in other parts of the country) is known as the catch basin outlet. The PD then runs all the way out to the middle of the street and drops into the main sewer.
I discount the idea of a cover or a clean-out. The clean-out almost always appears in the front of a property, with the rare exception a main sewer located. My guess would be that some time after the original construction of the catch basin, a repair was made that may have included the replacement of 2-3 sections of the 6" vitrified clay tile pipe that potentially either dropped (due to a washed-out joint) or was replaced during the repair.
Finally, even now, there appears to be some minor evidence of the far-end of the concrete above the private drain settling.