Sizing Box Gutters
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The side with the maximum flow is used to size the box gutter.
Sizing box gutters. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Calculate roof area to be drained by your gutter system and note. Then use the chart below to see what size gutter you need. If a roof s various drainage areas call for different size gutters go for the biggest one k style.
The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. The total flow is used to size the sump and overflow. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Gutter sizing step 2 research historical rainfall data gutter sizing step 3 calculate water flow during rainfall extremes gutter sizing step 4 calculate water handling capacity for gutter downspout options.
5 inch 5 520 square feet. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Then use the information below to see what size gutter you need. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts.
Please lower the maximum spacing between downspouts to see this effect. Learn more how to storm water design for building sites. Gutter sizing step 1 determine roof area to be drained. This free online box gutter calculator will calculate the size of box gutters and sumps with a side overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage.