When cesspool effluent is dumped into a specified
manhole under permission from the Engineer, it shall be discharged
through a pipe or hose in such a manner that none of the effluent
shall be left adhering to the sides or shelf of the manhole, and if
any such effluent is inadvertently allowed to adhere to the sides
or shelf of the manhole, the manhole shall be thoroughly cleaned with
clear water by the person or firm using the manhole.