G'day BarryJ:)
To get the rain to soak into the ground go around with spike/starstake or crow bar and drive as many holes into the ground that you can about a metre apart,Make sure that you know where the water, electricity, and drains are first, you need to penetrate the clay layer, I have 14ft of clay 3 to 4ft down, so it fills up like a lake and takes 10/14 days to soak through:(
cheers

