Doubling the number of downspouts halves the required capacity for each.
Calculate box gutter size.
6 inch 7 960 square feet.
Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.
Size downspouts to fit the gutter.
Sizes the depth shown of the box gutter is the depth at the upstream end.
Must have a constant slope between 1 40 and 1 200.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
We recommend using this calculator as a basic tool to begin determining the requirements for your drainage system however all information should be verified by.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Down pipe must be vertical from sump not to the side minimum sump length is 400mm.
Learn more how to storm water design for building sites.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
5 inch standard k style gutter shop 5 gutterbrush.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Northclad gutter size requirement calculator this calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.
5 inch 5 520 square feet.
Box gutters must be straight no bends.