Working like a natural river, Dam Buster elbow devices use the power of gravity to safely change direction by ninety degrees.
This revolutionary new product allows huge flexibility in roof drainage design whereby box gutters can be directed safely around corners and to a more appropriate outlet point. Even a cascading 'water slide' type outcome can be achieved using multiple elbow devices.
Both Left and Right hand versions are available, to suit box gutters between 200mm and 600mm wide, but as with all of our products, sizing ultimately depends on the flow rate being dealt with, and the corresponding flow rate at the end outlet.
NB: A Performance Solution is required for installation certification purposes of Dam Buster elbow devices; that document should be developed by a suitable expert such as a qualified hydraulic engineer, in accordance with the requirements of the National Construction Code.
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Watch How the Dam Buster Elbow Works
The unique Dam Buster elbow makes easy work of changing the direction in box gutters.
Theoretical analysis by Dam Buster’s hydraulics expert, Adjunct Assoc. Professor Robert Keller, along with physical testing to verify the theory, has established that the energy loss at the bend is less than the drop built into the device, and consequently backwatering cannot occur in the box gutter. The physical testing also confirmed there is significantly more freeboard in the critical locations within the device than required.