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I supposed 'demanded it' would be more accurate. Needs to attenuate for a one in thirty years storm event...!

Hi, Thanks in advance for any advice. I've just had a new 6mx3m extension built and was planning to connect the gutters to the existing house's downpipe. Because the total roof of the property is over 40m2 (the original was 48m2 anyway), the water company has asked that the runoff goes through...