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Downpipe, capacity and spacing.


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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. 

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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.

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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.

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