We recently recieved a review comment requesting that we install watertight joints on a RCP storm drain line due to the fact that the HGL showed that the pipe was surcharged.
This particular line is the most upstream segment in the system and the surcharge is due to inlet control.
My question is does this make sense? Is an inlet controlled pipe under pressure? I wouldn't think so due to the fact that inlet controlled pipes do not flow full.
Also we had this same request on some of the downstream lines where the pipe was surcharged by somewhere in the range of 0.1'-0.3'. I would think the pressure on these lines would be minimal. Does it make sense to install watertight joints? If not is there a reference that would help me make that argument?