Internal drainage swales are required for locations where a common side property swale cannot be constructed due to existing grading or unapproved grading on an abutting property. Minimum slope of 1.5%, a minimum depth of 10 cm and a width of 15 cm is required.
Common property swales (Detail A) are possible where common adjacent properties are suitably graded.
Retaining walls must be constructed to support any elevation difference between a Infill Housing Development property and an adjacent private property (Detail B)