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// CODE SNIPPET

1106.3 Vertical Leader Sizing

Plumbing Code 2015 of Utah > 11 Storm Drainage > 1106 Size of Conductors, Leaders and Storm Drains > 1106.3 Vertical Leader Sizing
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Vertical leaders shall be sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains. The flow rate through vertical leaders shall not exceed that specified in Table 1106.3.

TABLE 1106.3 VERTICAL LEADER SIZING

SIZE OF LEADER (inches) CAPACITY
(gpm)
2 30
2 × 2 30
11/2 × 21/2 30
21/2 54
21/2 × 21/2 54
3 92
2 × 4 92
21/2×3 92
4 192
3 × 41/4 192
31/2 × 4 192
5 360
4 × 5 360
41/2 × 41/2 360
6 563
5 × 6 563
51/2 × 51/2 563
8 1208
6 × 8 1208

For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.
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