Sanitary Sewer Tie-ins 1

[MahmoudSafaan]

We're working on main sanitary sewer line of a new city with diameters varying from 2000mm up to 2750mm.
There are lands which will be developed during the next +10years which had Tie-in points to the main line with diameter of 900mm up to 1300mm with depth of at least 3 meters and ending with manhole inside the developers'land.
The client asked to not execute that said manhole, is that proposal technically viable?

Sorry for my bad English.

 

[bimr]

No, it not be technically feasible. Manholes are installed for the purposes of access and cleaning of sewers.

 

[MahmoudSafaan]

Thank you for the reply, but the client proposed this so that it would be cost which later on to be damaged during development of these lands since that manhole is located inside the developers' land for the sole purpose that the developer would connect his network to the main line using that manhole.
However, we've discussed that the manhole is necessary to be constructed to avoid rodents and plant's roots from accessing the pipe lines. And the client yet not convinced.
I'm asking if there any other technical aspect for this case.

 

[bimr]

One doesn't know what type of facility that you are building or the type of facility that the developer is considering.

The technical reason for a manhole is that it will allow future cleaning of a sewer. Without the manhole, the sewer can not be cleaned. If your facility discharged materials that may foul the sewer, then you would want the manhole in the short term. If you are discharging typical municipal wastewater, then perhaps the sewer will not foul for years and the manhole may be installed in the long term.

Manholes are installed for the purposes of access and cleaning of sewers. Without knowing anything further about your project, nothing else can be said.

 

[cvg]

stubouts generally terminate at the right of way line with a plug, not with a manhole. manhole is not necessary unless there is some flow through the stubout that needs to be maintained and cleaned

 

[SwinnyGG]

If I were in your shoes, I would explain to the client that installing the manhole now, and then repairing it later if it is damaged, will be a much lower cost than they will incur in the future if the tie-in is left open to the main and the tie-in line is found to be plugged or damaged when they excavate to connect to it. The manhole allows maintenance and monitoring of the condition of the line.

There's also the fact that a competent contractor won't damage the manhole, and an incompetent contractor who damages the manhole will be required to assume the cost of any repair, not the developer.