Russell griffiths Posted March 30, 2018 Share Posted March 30, 2018 Are there any rules, or a general rule of thumb as to how many downpipes per gutter run for an example I know our house in oz should have had one outlet downpipe per 6m run of gutter are there any such regs over here my hydrology guy has drawn far to many downpipes and I want to get rid of a couple, but would like a bit of knowledge before I go for a chat. cheers russ. Link to comment Share on other sites More sharing options...
bassanclan Posted March 30, 2018 Share Posted March 30, 2018 If you go onto the gutter manufacturer's website there are calculators for area of roof, slope etc which hen gives volume of water etc which in turntells you minimum downpipe requirements, but you've got to consider distances and gradients etc of the gutters too. 1 Link to comment Share on other sites More sharing options...
Oz07 Posted March 31, 2018 Share Posted March 31, 2018 High flow will reduce. As has been said use manufacturer websites 1 Link to comment Share on other sites More sharing options...
CC45 Posted March 31, 2018 Share Posted March 31, 2018 Fit high flow gutters as standard. We've got 4 downpipes for a 250m2 build but two take prob 75% of the water. All seems good. If the gutter is level or only a slight slope the you could add another down pipe at the 'high' end - you've got the depth of the gutter to play with and it would work as an emergency downpipe. 1 Link to comment Share on other sites More sharing options...
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