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// CODE SNIPPET

1106.3 Vertical Leader Sizing

Plumbing Code 2018 of Kansas > 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)
230
2 × 230
11/2 × 21/230
21/254
21/2 × 21/254
392
2 × 492
21/2 × 392
4192
3 × 41/4192
31/2 × 4192
5360
4 × 5360
41/2 × 41/2360
6563
5 × 6563
51/2 × 51/2563
81208
6 × 81208
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.

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