In message of Tue, 3 Oct 2006, Chris Hogg writes
I doubt if all your drains go to your septic tank. Septic tanks aren't
usually intended to take rainwater. You probably have a soakaway
somewhere that takes rainwater from the house roof etc., so find a
convenient downpipe from the roof and its associated drain and siphon
into that. Or find the soakaway and siphon into it directly.

I see, I assumed all drains went into the tank. I have no idea where the
rainwater from the roof goes.

I know our whole septic tank / soakaway system is not working properly
any more. The tank needs to be emptied twice a year which I know isn't
right, and also there is a problem with the drains nearer the house, I
think the pipes have sunk a bit and so things aren't moving along
properly. The tank does seem to fill up more quickly after a week or two
of heavy rain.

I wish we had mains drainage!

Regards
Colette
--
Colette A. O'Brien