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Flat Roof
Drainage
Calculator
Calculate flat roof drainage requirements, scupper sizes, and roof drain count
Input Parameters
Roof Area (sq ft)
Rainfall Rate (in/hr)
Drain Type
Interior Roof Drains
Scuppers
Perimeter Gutters
Calculate
Results
--
Total Flow
gpm
--
Drains Required
--
Leader Pipe Size
in
--
Min Slope
in/ft
Reference