High cap gutters with (apparently) low cap downpipes??

[Richard]

Wandered into Wickes to buy a length of their 125mm 'high capacity' gutter. No problem with that until I looked for a length of suitably large downpipe. The high cap downpieces or whatever they are called fit the same downpipes as the 112 mm low cap gutters, i.e. about 50mm diameter at a guess. Is this right?

This might not be a problem but I intend draining the entire rear roof area of my house via a single downpipe.

Even the operative in Wickes suggested that it was a little odd having only one, small diameter, downpipe and that I should seek advice.

Ta

Richard

[Sam]

Well I guess the point is by it's very nature - being an enclosed tube - down pipe can't overflow whereas guttering can. And guttering has a very shallow angle whereas downpipe is at 90 dgrees from the horizontal and therefore clears a lot quicker. I suppose the idea of the high capacity guttering is that it won't will fill in a downpour long enough that overspill doesn't occur until the down pipe can clear the water. Are there any fluid dynamics bods in the group?

Sam

[nthng2snet]

suitably

called fit

also have a calculator for roof area and water flow dispersal and other techie stuff.

[Richard]

Thanks for the link and apologies for being particularly dense (it is Sunday tho'); where do I find the calculator bit?

TIA Richard

[nthng2snet]

and

(brings up a pdf file)> page 13 of that.

[Richard]

Thank you.

Richard