There are twoclassifications of roof drainage: conventional and
controlled flow (also called limited discharge). The conventional
system removes rainwater as quickly as it falls. The controlled flow
allows only a portion of the water falling on the roof to be dis-
charged, storing the remainder on the roof for a period of time.
Only the conventional roof drainage system will be discussed. In-
formation on controlled flow systems can be obtained from the
manufacturer or other references.
Each Calculator Wheel is double–sided, 9” in diameter and
comes with an instruction booklet.
Calculator wheels are designed for use by: Plumbing Engineers,
Plumbing Designers, Plumbing Specifiers, Master Plumbers and
Contractors.
There are twoclassifications of roof drainage: conventional and