On 19 Apr, 09:42, Hugo Nebula abuse@localhost wrote:
On Fri, 18 Apr 2008 23:02:38 +0100, a particular chimpanzee, Bruce
randomly hit the keyboard and produced:

sm_jamieson wrote:

I have used a mini-access chamber 300mm diameter (floplast from
screwfix). Max height 600mm (in line with building regs).
How likely is it that the BCO will fuss about the depth from ground
being a little over 600mm ?
I think most of them prefer to be asked, rather than find a problem at
an inspection.

However with something like this, if you phone up and ask the
question, "is it acceptable to install a 300mm diameter chamber deeper
than the maximum?", you're likely to get a negative answer.

OP: OTOH, if you were to install it, it might not be picked up on the
inspection. OTOOH, it might. "Ya pays ya money...".

Think about why a wider chamber is called for at greater depths, and
try this little experiment: lying on the ground, can you get your hand
to the bottom of the channel? If you can't, how are you going to be
able to clear a blockage if it did occur?
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"

Well, I've sent him an email saying I've done it and realised after it
was a little deeper.
To be honest the final ground level is a little uncertain anyway. The
house next door
does not use a 450mm chamber at the same location for the drain.
Also, do people really get down into a 450mm chamber to clear it ?
More likely to
poke with sticks I would have thought. And my arm is over 700mm long.
Also of course the issue of bending the drain rod in a smaller
diameter chamber is
relevant.
Simon.