In an earlier contribution to this discussion,
dennis@home wrote:

"sm_jamieson" wrote in message
...
I've set out the main part of my drainage, being old clay to new
inspection chamber to rest bend and soil pipe etc, with the gradient
at 1 in 40. Two other connections on the chamber are to connect to
two roddable bottle gullies (one under outside tap, other for rain
water runoff - combined sewer).

Where do they still allow rain water to be connected into foul drains?

Presumably everywhere where there is a combined sewer rather than separate
sewers for foul and surface water.
--
Cheers,
Roger
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