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1502.3 Scuppers
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Where scuppers are used for secondary (emergency overflow) roof drainage, the quantity, size, location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1611.1. Scuppers shall not have an opening dimension of less than 4 inches (102 mm). The flow through the primary system shall not be considered when locating and sizing scuppers.
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1502.3 Roof Assemblies and Rooftop Structures, Scuppers
Where scuppers are used for secondary (emergency overflow) roof drainage, the quantity, size, location and inlet elevation of the scuppers shall ...
Building Code 2018 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage > 1502.3 Scuppers
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Section 202 Definitions, Definitions
stairways providing two separate paths of egress located within one exit enclosure.
[BS] SCUPPER. An opening in a wall or parapet that allows ...