Manhole + pond

Thunderbird2

Hi . I'm going to build a bigger pond but remembered there is a sewage pipe going under the area I want to dig. Anyone know how far down these pipes would be? Could I lift the manhole out the back? It's cracking anyway

Dirk Gently

It depends if you''re at the start of the system or at the end. Start of the system will be shallow enough and it will fall down the row of houses.
Be careful lifting the man hole cover and make sure you check for drains in the manhole wall, not just the over all depth of the manhole. Could be an overflow or other drains at different levels.

You will be able to judge the line of the drain by lining up manholes, (usually every second garden).

Personally I'd avoid digging directly over it tbh.

Thunderbird2

Im not digging over the manhole just the pipe

Dirk Gently

depends how deep the drain is and how deep your digging tbh. can you not avoid the area at all?

Lift the man hole cover and check the walls for pipes breaking into it. Run a tap or shower which drains into the manhole and see what point it enters the manhole. Bring a torch, look for overflow pipes near the surface. My own manhole is about 20ft deep, but I have drains going into it at about 4 or 5 feet down.

ponddigger

hi .some photos would be a great help:Dponddigger:D

Thunderbird2

I don't know how to post photos !!!!!!!!!!!!!!!!!!!! How do I post them ?? :-)

ponddigger

hi thunder, this might help. http://www.boards.ie/vbulletin/showpost.php?p=55194002&postcount=23 :Dponddigger:D