For accurate project specific advice on rainwater flow calculations contact our friendly knowledgeable team on 0800 644 44 26.
Box gutter size calculator uk.
Upon completion a full set of rainwater drainage design calculations are provided confirming the.
15 m is a practical maximum gutter length to be served by a downspout.
For a typical gutter run up to a maximum of 10m the ratio of gutter lengths is calculated from.
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.
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.
The tools guide the user step by step allowing fast and simple roof drainage design whilst ensuring full compliance with bs en12056 3 rainwater drainage design standard.
Then use the chart below to see what size gutter you need.
Gutter ratio l1 l1 l2 where.
To limit the effects of thermal expansion in gutters 50 ft.
Learn more how to storm water design for building sites.
Calculate the effective catchment area x to be drained from the following table.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
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.
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.
Calculate the area of a roof to work out how much guttering is required.
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.
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6 inch 7 960 square feet.
Choose gutter outlets according to published flow rate capacities.
Our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
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.
5 inch 5 520 square feet.
