My sump discharge is wedged behind a finished basement drywall and is squeezed above two windows and the ceiling. The discharge line is touching the vent under my sons bedroom and when the pump kicks on it may be waking him up. This was installed by a licensed plumber and he did a good job considering the major space limitations he had to deal with. In addition to the noise I'm getting a pond/stream of water in the front yard where the discharge exits so I plan on installing a drywell surrounded with plenty of gravel.

To unwedge and lower the discharge line off the vent I was thinking of tying the sump line discharge into an abondoned sewer line that is mostly under my driveway. I would attach the end of the sewer line to the drywell. The access for the sump discharge to the abondoned sewer line would be a 2" kitchen drain line that exits basement about 8" off the ground. The sewer line was abondoned because there's a crack in the pipe about 15 feet upstream of where the kitchen drain ties into the main drain(house was built in 53' and had two pipes exiting basement wall above ground with the smaller kitchen line tying in perpendicular to the larger main pipe.

Assuming the abondoned pipe still has the right pitch would this idea work? Any problems to watch out for?



Edited 2 times.

so much depends on the capacity of the drywell and how much water you are pumping into it.
sometimes the water you pump goes into the ground and finds its way back into the house.