1. A. Secondary Drainage Required. Secondary (emergency) roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water would be entrapped should the primary drains allow buildup for any reason.
2. B. Separate Systems Required. Secondary roof drain systems shall have piping and point of discharge separate from the primary system. Discharge shall be above grade_(G) in a location which would normally be observed by the building occupants or maintenance personnel.

3. C. Maximum Rainfall Rate for Secondary Drains. Secondary (emergency) roof drain systems or scuppers shall be sized based on the flow rate caused by the 100-year 15 minute precipitation as indicated in Figure 1113.C of this Part. The flow through the primary system shall not be considered when sizing the secondary roof drain system.

   Figure 1113.CRainfall Rate for Primary Roof Drains (in./hr.)

Authority Note

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

Historical Note

HISTORICAL NOTE: Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 38:2879 (November 2012).