drain design

Hi all, I am in talks with the water authority re the position of a public sewer manhole at the rear of a proposed single story extension. As it stands, the extension is planned to be built right up to the chamber cover. The water authority have agreed that we can make adaptations to this...

Hi, my back garden drain takes the discharge from two household waste pipes and a rain water downpipe. Inside the drain there is a hole that seems to be the same size as the rainwater downpipe. My question is - could it be the case that the rainwater downpipe should be slotted into this hole...