Vertical drops in manholes
Vertical drops in manholes
(OP)
We are going to be field fitting alot of sewer pipes in manholes coming up in a recent job.
The preference is to come in at the bottom of the manhole with a pre-benched base, but we may have a scenerio where we will have to drill into the side of a manhole and come in above the bottom. Is a vertical drop a problem? if so, is there a certain depth i should be concerned about?
The preference is to come in at the bottom of the manhole with a pre-benched base, but we may have a scenerio where we will have to drill into the side of a manhole and come in above the bottom. Is a vertical drop a problem? if so, is there a certain depth i should be concerned about?





RE: Vertical drops in manholes
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Vertical drops in manholes
You need to contact the regulatory authority having jurisdiction over the manholes in question. The regulatory authority will be able to tell you what the requirements are.
RE: Vertical drops in manholes
Drops in large sewers are a big deal and gas check manholes and other details are required and if extreme case (deep vertical drops) you may need hydraulic drop structures - but I assume you are talking about smaller sewers - less than 18 inch say
RE: Vertical drops in manholes
Concluding points are made indicating that in whatever configuration drops can be some problematic and should be used sparingly e.g. (I guess when it is not economically feasible to use vertical curves or steepen incoming sewers etc.)