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About this chapter: Chapter 33 regulates methods and systems that control storm water from a building, such as from subsoil drainage systems and rainfall on roof surfaces. Regulations for sumps and pumping systems for subsoil drainage systems are provided in this chapter.
Code development reminder: Code change proposals to this chapter will be considered by the IRC—Mechanical/Plumbing Code Development Committee during the 2021 (Group A) Code Development Cycle.
The provisions of this chapter shall govern the materials, design, construction and installation of storm drainage.
Subsoil drains shall be open-jointed, horizontally split or perforated pipe conforming to one of the standards indicated in Table P3302.1. Such drains shall be not less than 4 inches (102 mm) in diameter. Where the building is subject to backwater, the subsoil drain shall be protected by an accessibly located backwater valve. Subsoil drains shall discharge to a trapped area drain, sump, dry well or approved location above ground. The subsoil sump shall not be required to have either a gastight cover or a vent. The sump and pumping system shall comply with Section P3303.
TABLE P3302.1
Cast-iron pipe
ASTM A74; ASTM A888; CISPI 301
Polyethylene (PE) plastic pipe
ASTM F405; CSA B182.1; CSA B182.6; CSA B182.8
Polyvinyl chloride (PVC) plastic pipe
(type sewer pipe, SDR 35, PS25, PS50 or PS100)
ASTM D2729; ASTM D3034; ASTM F891; CSA B182.2; CSA B182.4
Stainless steel drainage systems, Type 316L
ASME A112.3.1
Vitrified clay pipe
The sump pump, sump and discharge piping shall conform to Sections P3303.1.1 through P3303.1.4.
The sump pump shall be of a capacity and head appropriate to anticipated use requirements.
The sump shall be not less than 18 inches (457 mm) in diameter and 24 inches (610 mm) deep, unless otherwise approved. The sump shall be accessible and located so that all drainage flows into the sump by gravity. The sump shall be constructed of tile, steel, plastic, cast iron, concrete or other approved material, with a removable cover adequate to support anticipated loads in the area of use. The sump floor shall be solid and provide permanent support for the pump.
Electrical outlets shall meet the requirements of Chapters 34 through 43.
Discharge piping shall meet the requirements of Sections P3002.1, P3002.2, P3002.3 and P3003. Discharge piping shall include an accessible full-flow check valve. Pipe and fittings shall be the same size as, or larger than, the pump discharge tapping.