Do you need a soakaway over a certain size of draining roof or something?
Also pretty much any sized roof will "catch" a lot more rain than you expect. And even a pitched roof diverts most of that water onto two quite narrow strips.
A crazy amount. Our extension roof at the back can easily get 200L in a few hours.
This is why fucked guttering is so damaging.
@hugo7 started
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Do you need a soakaway over a certain size of draining roof or something?