Gravity System Roof Drainage Calculator - BS EN 12056-3:2000

The following tools are programmed to facilitate the design of gravity roof drainage systems, including gutters, roof outlets, gravity rainwater pipes based on the design principles established in

BS EN 12056-3:2000 Gravity drainage systems inside buildings - Part3: Roof drainage, layout and calculation

These tools are provided free of charge to promote proper design of gravity rainwater drainage systems.
While every care has been taken to ensure that all the functions complies to the engineering and design principles as stated in BS EN 12056-3:2000, it is impossible to include all the requirements from the standards. It is important that the user should familiarise him/herself with other relevant requirements in the BS EN 12056-3:2000.
It is assumed that the user has sufficient understanding on good design practices to make use of the design tools.
By using the design tools, you understand and agree that we will not be held liable for any outcome or results whatsoever from the use of the design tools.