Is there a Calgary bylaw about tile runoff and drainage from an outdoor patio into the storm sewer?

Yes, the City of Calgary has specific bylaws governing stormwater runoff from residential properties, including tiled patios, under the Sewers Bylaw and Land Use Bylaw. While there's no bylaw specifically targeting "tile runoff," your outdoor patio drainage must comply with Calgary's stormwater management requirements.

Key Calgary Requirements for Patio Drainage:

Under Calgary's Sewers Bylaw, you cannot direct surface water from your property directly into the storm sewer system without proper controls. This includes runoff from tiled patios, driveways, and other hardscaped areas. The city requires that stormwater be managed on-site through infiltration, retention, or controlled release wherever possible.

For a typical residential tiled patio, this means you cannot simply slope the tile to drain directly into a storm drain or catch basin. Instead, the runoff should be directed to:

• Permeable landscaping where it can infiltrate naturally


• A rain garden or bioswale designed to capture and slowly release stormwater


• Gravel infiltration areas around the patio perimeter


• Existing lawn areas that can absorb the additional water

Calgary's Low Impact Development (LID) Guidelines encourage homeowners to minimize impervious surfaces and manage stormwater on-site. A large tiled patio creates an impervious surface that increases runoff velocity and volume, potentially contributing to downstream flooding and erosion.

Practical Considerations for Calgary Patio Tile:

When installing outdoor tile in Calgary, work with your contractor to design proper drainage that complies with city requirements. This typically involves:

• Sloping the patio away from the house (minimum 1/4-inch per foot) toward landscaped areas


• Installing a French drain system along the patio edge to collect and infiltrate runoff


• Using permeable joint materials between tiles where appropriate


• Creating buffer zones of permeable landscaping around the patio

Remember that any outdoor tile in Calgary must be frost-rated porcelain with water absorption below 0.5%. The drainage system itself must also be designed to handle freeze-thaw cycles without heaving or blocking.

When to Check with the City:

For large patios (over 200-300 square feet) or complex drainage situations, contact Calgary Planning & Development at 311 to discuss your specific site conditions. They can advise whether your drainage plan meets city requirements and whether any permits are needed for the drainage infrastructure.

Need help finding a tile contractor experienced with Calgary's drainage requirements? Calgary Tiling can match you with professionals who understand both proper tile installation and compliant stormwater management.