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7”STORM DRAINAGE
1106.2 Size of storm drain piping.Vertical and horizontal
storm drain piping shall be sized based on the flow rate
through the roof drain.The flow rate in storm drain pipingshallnotexceedthatspecifiedinTable1106.2.
1106.3 Vertical leader sizing.Vertical leaders shall be sized
‘based on the flow rate from horizontal gutters or the maxi-
mum flow rate through roof drains.The flow rate through
vertical leaders shall not excced that specified in Table
1106.3.
‘11064 Vertical walls.In sizing roof drains and storm drain-
age piping,one-half of the area of any vertical wall that
diverts rainwater to the roof shall be added to the projectedroofareaforinclusionincalculatingtherequiredsizeofver-
ing.
1106.5 Parapet wall scupper location.Parapet wall roof
<drainage scupper and overflow scupper location shall complywiththerequirementsofSection1503.4 of the International
Building Code.
1106.6 Size of roof gutters.Horizontal gutters shall be sized
based on the flow rate from the roof surface.The flow rate in
horizontal gutters shall not exceed that specified in Table
1106.6.
‘SECTION 1107
‘SIPHONIC ROOF DRAINAGE SYSTEMS
1107.1 General.Siphonic roof drains and drainage systemsshallbedesignedinaccordancewithASMEA112.6.9 and
ASPE 45.
SECTION 1108
‘SECONDARY (EMERGENCY)ROOF DRAINS
1108.1 Secondary (emergency overflow)drains or scup-
‘pers.Where roof drains are required,secondary (emergency
overflow)roof drains or scuppers shail be provided where the
roof perimeter construction extends above the roof in such a
manner that water will be entrapped if the primary drainsallowbuildupforanyreason.Where primary and secondary
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1108.2 Separate systems required.Secondary roof drain
systems shall have the end point of discharge separate from
the primary system.Discharge shall be above grade,in alocationthatwouldnormallybeobservedbythebuilding
‘occupants or maintenance personnel.
TABLE 1106.3
VERTICAL LEADER SZING
‘SIZE OF LEADER CAPACTY
Gnches)(som)
2 30
2x2 30
TxD,30
2h,EI2x234
3 2
2x4 22x32
4 192
3x4Y,192
3x4 192
3 360
4x5 360ax,360
6 563
5x6 563
SxS,563
8 1208
6x8 1208
Fork:Vinch =254 mm,1galloperminute=3.785 Lim.
TABLE 1106.2
STORM DRAIN PIPE SIZINGaCAPACITYapm)
‘SLOPE OF HORIZONTAL DRA_—VERTICAL DRAIN|ui parfoot|Tyinch pertoot|Yitnch perfoot|iylnchperfoat
z a 5 2 3I a3a33Bara180a1151sBi
3 ai 17 16 Ba 31
6 338 8 a a7 Cy ‘
3 TT 305 7a 7010 149
10 2050 327 Tait 1855 260323214802,058 2.960 4875358825083.546 3016 7.088
For Sk:Vinch=25.4 mm,|foot=304.8 mum,1gallonporminute=3.785 Lim.
£2015 INTERNATIONAL PLUMBING CODE*