drop manhole on sanitary sewer lateral
drop manhole on sanitary sewer lateral
(OP)
The gradient I'm dealing with to connect the sanitary sewer lateral to the main is too steep to run a straight pipe. That usually means installing a drop manhole. This is a residential scenario, so I'm envisioning going from the house at 2-3 fps until I get to the spot where I need to drop ~15' and then connecting up to the existing connection at the main. I'm hoping I can do this with a 4" cleanout to grade and not have to install a full on manhole structure. Would anyone like to share their previous experiences? Thank you in advance.





RE: drop manhole on sanitary sewer lateral
What you suggests sounds similar to a "deep service riser" which is a local standard practice for connection to deep sewer mains.
Service enters top of the main. Restrained joints. No extension to the surface though.
RE: drop manhole on sanitary sewer lateral
RE: drop manhole on sanitary sewer lateral
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: drop manhole on sanitary sewer lateral
RE: drop manhole on sanitary sewer lateral
I agree with CarlB that the service riser is the most common method to accomplish this service connection. See the attached sketch and confirm with the local utility.
Service lines usually have a minimum of 1% slope as you suggest until you reach the service riser.
Some communities also require a cleanout connection located near the building.
RE: drop manhole on sanitary sewer lateral