Ontario Building Code 2024: Sewage System Design and Clearances for London Construction
Sarah's Expert Insight
OBC Compliance Specialist
"Accurately calculating sewage volume for specialized facilities like veterinary clinics is critical to ensuring long-term system viability and environmental compliance. At empcontracting.ca Inc. your construction contractor in London, Ontario, we emphasize that site-specific percolation tests, especially in sensitive areas like Muskoka or rural London, directly dictate these mandatory clearance distances to protect local groundwater."
When planning specialized commercial builds, understanding the 2024 Ontario Building Code (OBC) requirements for sewage systems is essential. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure your project meets the rigorous standards set out in Part 8 of the OBC Compendium.
Sanitary Sewage Flow for Commercial Occupancies
Table 8.2.1.3.-B outlines the design daily sanitary sewage flow for various establishments. For specialized facilities, the calculations are specific to usage patterns:
Veterinary Clinics
- Per Practitioner: 275 litres
- Per Employee (8-hour shift): 75 litres
- Per Stall, Kennel, or Cage: 75 litres (if floor drain connected)
Warehouses
- Per Water Closet: 950 litres
- Per Loading Bay: 150 litres
It is important to note that the highest flow resulting from multiple calculations must be used to determine the design daily sanitary sewage flow, ensuring the system is never undersized for the facility's peak demand.
Mandatory Clearance Distances for Sewage Systems
Article 8.2.1.4 and 8.2.1.5 establish the minimum horizontal clearances required between sewage systems and surrounding structures or water bodies. These regulations are designed to protect both the building integrity and the local environment.
Percolation Time and Site Conditions
Clearance requirements are heavily influenced by soil conditions:
- Percolation time ≥ 10 min: Systems must conform to standard clearances in Article 8.2.1.5 or 8.2.1.6.
- Percolation time < 10 min: Clearances for wells, lakes, and streams must be increased to compensate for faster soil drainage and potential contamination risks.
Furthermore, the OBC strictly prohibits any building construction closer to a sewage system than the specified minimums and forbids the overlap of multiple sewage systems on a single parcel of land.
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.