Wet Weather Flow Management Guidelines

Overview

The companion guidelines to the wet weather flow management policy Council adopted in September 2003, issued by Toronto Water in November 2006 with a letter to readers from the Director of Water Infrastructure Management. They set the interim hierarchical principles and land-based targets and criteria for water balance, water quality — total suspended solids and E. coli — and water quantity, covering flood flow, erosion control, erosion and sediment control during construction and discharge to municipal infrastructure, then lot level source controls including green roofs and rainwater harvesting.

What it covers

• Letter to Readers
• Further Studies / Outstanding Issues
• 1. Purpose of Document
• 2. Wet Weather Flow Management Targets and Criteria (Interim)
• 2.1 Hierarchical Principles
• 2.2 Water Management (Land- Based) Targets/Criteria
• 2.2.1 Water Balance Management
• 2.2.2 Water Quality Management
• 2.2.3 Water Quantity Management
• 3. Other Guidelines and Policies for Lot Level Source Control Practices
• Appendix A- Wet Weather Flow Master Plan (Objectives)
• City of Toronto Oil/Grit Separators (OGS) Guideline (Interim)
• Appendix C- Information from TRCA