Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The City of Toronto has developed a Wet Weather Flow Management Master Plan incorporating a new philosophy in wet weather flow management where rainwater is recognized as a resource; wet weather flows are to be managed on a watershed basis; and a hierarchical approach to wet weather flow management is to be used, starting with at source, followed by conveyance and finally end-of-pipe control measures. Two major sets of alternatives were analyzed to establish whether receiving water and infrastructure protection and renewal objectives could be achieved. Source controls at the lot level [such as low impact development: LID techniques] and conveyance control measures were insufficient. A set of five alternative strategies were formulated. Each of the strategies were developed, in accordance with the adopted hierarchical principle and varied in terms of three levels of targets: status quo, moderate enhanced and significant enhanced, to reflect increasing levels of ecological enhancement and infrastructure renewal. The preferred strategy, aimed at achieving the ambitious goal of meeting Provincial Water Quality Objectives in area surface waters may take 75 to 100 years to implement, at a cost estimated to be in the order of CAN. 12 billion, and required a considerable number of technologies not presently used for remediating stormwater runoff. Consistent with the planning horizon for Master Plans, a 25-year implementation schedule was developed from the preferred strategy. Overall benefits expected in the first 25 years include: swimmable waterfront beaches; control of combined sewer overflows in compliance with legislative requirements; basement flooding protection; protection of the City's infrastructure from stream erosion; restoration of degraded local streams and aquatic habitat and the reduction of algal growth along the waterfront and improved stream water quality in area watercourses. The cost of the Plan over the 25 years is estimated to be CAN 1.047 billion with an additional CAN 233 million in operational and maintenance costs.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2005-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more