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Drainage swales are shallow-sided, sloped channels intended for the conveyance of surface runoff. They are located between or around buildings and are graded to intercept and convey surface runoff to the nearest on-site catch basin, preventing lot-to-lot drainage.

Minimum Swale Slope Requirements

The minimum slope for a swale depends on the surface.

  • Grass drainage swale: 1.5%
  • Concrete drainage swale: 0.75%

For other requirements for swales, refer to the lot grading drawings page.

Example Swales

For More Information

Development Services, Lot Grading

2nd Floor, Edmonton Tower
10111 104 Avenue NW
Edmonton, AB

T5J 0J4



Fax 780-496-2865

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