On Tue, 18 Jan 2005 18:52:24 -0000, Pecanfan wrote:

I'm not an expert on such matters, but have been looking into similar things
myself recently. I can't see anything in building regs which specifically
says you CAN'T run SW to a FW drain, however reading between the lines I
doubt it would pass building regs, if inspected - I doubt the water board
would be too happy either. Building regs says surface water can run into a
drainage system, whereby a rainwater drainage system: "carries the flow of
rainwater from the roof to an outfall (a soakaway, a watercourse, a surface
water or a combined sewer)...".

I suppose the biggest risk is the FW sewer overflowing in torrential rain.

It is permissible, but only as a third choice, where the other options
aren't "reasonably practicable".
http://www.odpm.gov.uk/stellent/groups/odpm_buildreg/documents/page/odpm_breg_600283-05.hcsp#P1601_100217