Storm Drainage (Runoff)
Drainage is a critical requirement for every subdivision. Inadequate
drainage can lead to flooding , resulting in erosion, loss of stability
or in property damage. In addition, subdivisions that are not properly
drained can result in damage to highways both in and downstream from
the subdivision, resulting in a public safety hazard.
Storm water must be considered both in the subdivision and outside
of it. The applicant may be required to have a drainage study or design
prepared by a Professional Engineer or hydrologist. Drainage should
be carried to a natural outfall or approved storm drain capable of carrying
the additional flow.
Storm drainage requirements are developed and maintained by the Construction
and Maintenance Branch. The design guidelines
are contained in the Hydraulics Manual, which is also in the most recent edition
of the TAC Guide
Storm drainage systems should be certified for construction and location and designed by a registered hydrologist.
86(1)(c)(iv) of the Land Title Act permits the Provincial Approving
Officer to refuse subdivisions if the land has inadequate drainage installations.
A local government may regulate drainage for subdivisions by a Subdivision
Servicing Bylaw. The Ministry of Transportation and Infrastructure specifies drainage
requirements for highways.