The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75.
Box gutter size calculator uk.
So for a roof that is 5 m long with a height of 4 m and the roof width is 8 m which makes the half roof width 4m we can calculate the effective roof area like this.
Lg 10 133 therefore reduction factor 0 86 d 0 1 gutter capacity x reduction factor 2 84 x 0 86 2 44 l s therefore the proposed system is suitable.
6 inch 7 960 square feet.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
5 inch 5 520 square feet.
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Choose gutter outlets according to published flow rate capacities.
For accurate project specific advice on rainwater flow calculations contact our friendly knowledgeable team on 0800 644 44 26.
For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from.
Table 1 calculation of area drained type of surface effective design area m 1 flat roof plan area of relevant portion 2 pitched roof 30 pitched roof 45 pitched roof 60 plan area of portion x.
Then use the chart below to see what size gutter you need.
15 m is a practical maximum gutter length to be served by a downspout.
Depending on building type a safety factor should be allowed for the sizing of internal gutters.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Calculate the area of a roof to work out how much guttering is required.
To select the size of the classical rainwater system the following method should be used.
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.
Calculate the effective catchment area x to be drained from the following table.
To limit the effects of thermal expansion in gutters 50 ft.
Resources aluminum series acm series column covers fastener series zinc series testing data aama pdf astm pdf gutter sizing sheet metal gages order literature 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.
Upon completion a full set of rainwater drainage design calculations are provided confirming the.
L1 l2 selecting gutter size there is no standard rate of rainfall in the uk so for accurate calculations refer to an approved weather authority to get a site specific rainfall level.
Design area effective area 5 x 10 x 1 29 64 5m run off 64 5m x 0 022 l s per m 1 42 l s from chart 125 x 100 gutter with 76 ΓΈ downpipe appears suitable but check.
Our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge.
