On 29 Jun 2005 10:25:59 -0700, "Calvin" wrote:


The building regs prefer soakaways as a way of dealing with rainfall
because they allow it to be soaked into the ground over a long(er)
period thus helping to prevent some of the disasterous flooding we've
seen in the last year. They also avoid sewage plants becomming
overloaded during periods of peak rainfall, the outcome of which is,
er, unpleasant.

Even with sewage plants, 20 million tonnes of sewage flow into the
river Thames every year.

Graham