Page 104 - 2018_IPC

CHAPTER 11
STORM DRAINAGE

User note:
About this chapter: Rainfall onto buildings must be removed and directed to a location that can accommodate storm water. Chapter 11 spec-
ifies the design rainfall event for the geographic area and provides sizing methods for piping and gutter systems to convey the storm water
away from the building. Included in this chapter are regulations for piping materials and subsoil drainage systems.

SECTION 1101 SECTION 1102
GENERAL MATERIALS
1102.1 General. The materials and methods utilized for the
1101.1 Scope. The provisions of this chapter shall govern the
materials, design, construction and installation of storm construction and installation of storm drainage systems shall
drainage. comply with this section and the applicable provisions of
Chapter 7.
1101.2 Disposal. Rainwater from roofs and storm water from 1102.2 Inside storm drainage conductors. Inside storm
paved areas, yards, courts and courtyards shall drain to an drainage conductors installed above ground shall conform to
approved place of disposal. For one- and two-family dwell- one of the standards listed in Table 702.1.
ings, and where approved, storm water is permitted to dis-
charge onto flat areas, such as streets or lawns, provided that 1102.3 Underground building storm drain pipe. Under-
the storm water flows away from the building. ground building storm drain pipe shall conform to one of the
standards listed in Table 702.2.
1101.3 Prohibited drainage. Storm water shall not be 1102.4 Building storm sewer pipe. Building storm sewer
drained into sewers intended for sewage only. pipe shall conform to one of the standards listed in Table
1102.4.
1101.4 Tests. The conductors and the building storm drain
shall be tested in accordance with Section 312. TABLE 1102.4
BUILDING STORM SEWER PIPE
1101.5 Change in size. The size of a drainage pipe shall not MATERIAL STANDARD
be reduced in the direction of flow.
Acrylonitrile butadiene styrene
1101.6 Fittings and connections. Connections and changes (ABS) plastic pipe in IPS ASTM D2661; ASTM F628;
in direction of the storm drainage system shall be made with diameters, including Schedule 40, ASTM F1488; CSA B181.1;
approved drainage-type fittings in accordance with Table DR 22 (PS 200) and DR 24 (PS CSA B182.1
140); with a solid, cellular core or
706.3. The fittings shall not obstruct or retard flow in the sys- composite wall.
tem.
ASTM A74; ASTM A888;
[BS] 1101.7 Roof design. Roofs shall be designed for the Cast-iron pipe CISPI 301
maximum possible depth of water that will pond thereon as ASTM C14; ASTM C76;
determined by the relative levels of roof deck and overflow Concrete pipe CSA A257.1M; CSA A257.2M
weirs, scuppers, edges or serviceable drains in combination
with the deflected structural elements. In determining the Copper or copper-alloy tubing ASTM B75; ASTM B88;
maximum possible depth of water, all primary roof drainage (Type K, L, M or DWV) ASTM B251; ASTM B306
means shall be assumed to be blocked. The maximum possi- ASTM F667;
ble depth of water on the roof shall include the height of the Polyethylene (PE) plastic pipe ASTM F2306/F2306M;
water required above the inlet of the secondary roof drainage ASTM F2648/F2648M
means to achieve the required flow rate of the secondary Polypropylene (PP) pipe ASTM F2881; CSA B182.13
drainage means to accommodate the design rainfall rate as
required by Section 1106. Polyvinyl chloride (PVC) plastic
pipe (Type DWV, SDR26, ASTM D2665; ASTM D3034;
1101.8 Cleanouts required. Cleanouts shall be installed in SDR35, SDR41, PS50 or PS100) ASTM F891; ASTM F1488;
the storm drainage system and shall comply with the provi- in IPS diameters, including CSA B182.4;
sions of this code for sanitary drainage pipe cleanouts. Schedule 40, DR 22 (PS 200) and CSA B181.2; CSA B182.2
DR 24 (PS 140); with a solid,
Exception: Subsurface drainage system. cellular core or composite wall.
Vitrified clay pipe ASTM C4; ASTM C700
1101.9 Backwater valves. Storm drainage systems shall be
provided with backwater valves as required for sanitary Stainless steel drainage systems, ASME A112.3.1
drainage systems in accordance with Section 715. Type 316L

2018 INTERNATIONAL PLUMBING CODE ® 87
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