Rainwater Outlet Flow Rate Calculations

The figures below show flow rates relating to IKO’s range of aluminium and stainless steel refurbishment rainwater outlets. This data can then be used to calculate the number of outlets required for the particular location of your project.

Notes: Area (m2) = length (m) x width (m)
Total flow rate = rainfall intensity x area (m2)
Regardless of the size of roof area, there must always be a minimum of two outlets.
IKO’s Refurbishment Outlets are manufactured to meet National Plumbing code ULC/ORD C790.4 – 1996 requirements, and in accordance with ISO 9002.