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Comprehensive and Detailed Explanation:

IPC Section 1101.4 and related provisions require secondary drainage systems (scuppers, secondary roof drains) to handle potential overflow if primary drains become blocked, preventing structural overload from ponding water. Sizing uses rainfall rates for the area and roof square footage. In Westchester, local rainfall data guides calculations. Journey plumbers install these with independent discharge paths, often to grade or approved points, never connecting storm to sanitary. Chapter 11 covers materials, leaders, and horizontal piping sizing. Exams emphasize distinguishing primary vs. secondary systems and prohibitions on combined piping. Proper design protects buildings from water damage. Study guides cover Table 1106.2 and similar for flow capacities. Installation includes strainers, expansion provisions, and supports. Compliance with both plumbing and building codes is mandatory. Understanding these rules supports safe stormwater management and avoids costly roof failures. Always confirm with the AHJ for site-specific requirements.