This storm drainage riser diagram details the vertical piping layout for storm drain and overflow drain systems connected to multiple roof catchment areas ranging from 6 square feet to 711 square feet. The four-inch diameter storm drain and overflow drain lines tie into a centralized stack with typical four-inch pipe sizing throughout. Flow directions and drain designations are clearly indicated with arrows and standard pipe labels.
SD 1B SD SD 5 4"SD 4"OD SD 6 SD OD OD 6 6 SF 473 SF SD OD OD 9 SD 9 OD 7 SD 8 SD 7 4"SD 4"OD 310 SF 386 SF 711 SF SD SD 4"Ø TYP. 4"SD 4"SD 4"SD 4"OD 4"SD 4"OD
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