Do you need a soakaway over a certain size of draining roof or something?
I've used the official BackOfAnEnvelopeā¢ lookup tables, combined with a bit of wishful thinking.
I've seen the water coming out of the downpipe, however, and am pretty sure that it would fill a butt pretty quickly.
@NotThamesWater started
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Do you need a soakaway over a certain size of draining roof or something?