2024 Ontario Building Code (OBC) Sewage Design Flows for Commercial Occupancies
Sarah's Expert Insight
OBC Compliance Specialist
"Accurately calculating sewage flow according to Table 8.2.1.3.-B is critical for infrastructure sizing, particularly for custom commercial builds in London or cottage-country commercial developments in Muskoka where septic capacity is limited. At empcontracting.ca Inc. your construction contractor in London, Ontario, we emphasize that these flow rates often dictate your entire plumbing layout and municipal connection fees, so precision during the design phase is non-negotiable."
When planning a commercial build or renovation, understanding OBC Table 8.2.1.3.-B is essential for determining the daily design sewage flow. As empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in translating these complex 2024 Building Code Compendium requirements into actionable construction plans.
Daily Design Sewage Flow for Public and Assembly Buildings
The code specifies volume in litres based on the type of establishment and its usage patterns. Miscalculating these figures can lead to significant issues with plumbing permits and site services.
Transportation and Assembly Requirements
- Airports and Terminals: Calculated at 20L per passenger plus 40L per employee per shift.
- Assembly Halls and Churches: Facilities with no kitchen require 8L per seat, whereas those with kitchen facilities must account for 36L per seat.
- Bowling Alleys: Allocated at 400L per lane.
Professional and Personal Service Occupancies
Medical and personal care facilities have higher water demands due to specialized equipment and sanitation needs.
- Barber Shops and Beauty Salons: 650L per service chair.
- Dentist Offices: 275L per wet service chair and 190L per dry service chair.
- Doctor’s Offices: 275L per practitioner plus 75L per employee per shift.
- Day Care Facilities: 75L per person (includes staff and children).
Food Service and Industrial Operations
Food service facilities are categorized by their intensity of use, which significantly impacts the required sewage capacity.
Restaurant and Dining Flow Rates
- Standard Restaurants: 125L per seat (non-24 hour).
- High-Intensity (24-Hour) or Donut Shops: 400L per seat.
- Take-out Only: 190L per 9.25 m² of floor area plus employee allocations.
- Drive-in Restaurants: 60L per parking space.
Industrial and Workplace Standards
For factories, the flow depends on the presence of sanitation facilities: 75L per employee without showers, and 125L per employee if showers are provided. For expert guidance on these calculations, contact empcontracting.ca Inc. your construction contractor in London, Ontario today.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.