User note: Code change proposals to this chapter will be considered by the IRC ‒ Plumbing and Mechanical Code Development Committee during the 2015 (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 listed 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 gas-tight cover or a vent. The sump and pumping system shall comply with Section P3303.
TABLE P3302.1 SUBSOIL DRAIN PIPE
TABLE P3302.1 SUBSOIL DRAIN PIPE
| MATERIAL | STANDARD |
| Cast-iron pipe | ASTM A 74; ASTM A 888; CISPI 301 |
| Polyethylene (PE) plastic pipe | ASTM F 405; CSA B182.1; CSA B182.6; CSA B182.8 |
| Polyvinyl chloride (PVC) Plastic pipe (type sewer pipe, SDR 35, PS25, PS50 or PS100) | ASTM D 2729; ASTM D3034; ASTM F 891; CSA B182.2; CSA B182.4 |
| Stainless steel drainage systems, Type 316L | ASME A112.3.1 |
| Vitrified clay pipe | ASTM C 4; ASTM C 700 |
The sump pump shall be of a capacity and head appropriate to anticipated use requirements.
The sump pit shall be not less than 18 inches (457 mm) in diameter and 24 inches (610 mm) deep, unless otherwise approved. The pit shall be accessible and located so that all drainage flows into the pit by gravity. The sump pit 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 pit floor shall be solid and provide permanent support for the pump.