Roofconsult Website Roof Drainage Calculations to BS EN 12056-3:2000
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We have carried out the calculations detailed in the standard for some of the main roof/gutter/outlet configurations normally associated with industrial and commercial buildings. For domestic rainwater gutters calculations contact David Roy
The results of the calculations are shown in a series of tables. The results are generally conservative, and often a more rigorous calculation may produce a more cost effective solution.

Select the basic data required and then click the View button below.

Rainfall Intensity
Select Nearest Town
Gutter Type

Down Pipe Diameter

To view more details of the standard and the assumption made in the preparation of the tables click here
If you would like your own software for drainage calculations click here for more details
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