Swales

Drainage swales are shallow-sided, sloped ditches designed to convey surface runoff away from buildings towards the nearest street, lane, dry pond or stormwater management lake to prevent lot-to-lot drainage. These swales are usually located along common property lines and sometimes at the back of a lot. They should be graded in accordance with an approved Lot Grading Plan.

In some areas, an easement or right-of-way is required for grass or concrete drainage swales. Easements are shown on the approved Lot Grading Plan. Each swale within a property should contain a minimum of 15 cm unobstructed width within the subject property.

Minimum Slope
  • Grass drainage swale: 1.5%
  • Concrete drainage swale: 0.75%
  • Due to the topography of some neighbourhoods, lot-to-lot drainage may occur on an approved Lot Grading Plan. In those situations, lot-to-lot surface drainage is acceptable, but it is important that all affected lots are graded properly.
See our blueprints for more detail.

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