INFLOW & INFILTRATION REDUCTION STRATEGY The Region and the local municipalities have an opportunity to demonstrate leadership in inflow and infiltration reduction within the water and wastewater industry. ii Inflow and Infiltration Reduction Strategy Table of Contents Executive Summary . 8. 3 .2011-2031 I/I Reduction Strategy . 61. 1 . Background and Rationale . 31. 3 .1 Strategy Introduction . 61. 3 .2 Governance Structure . 62. 1 .1 Strategy Purpose – Minister’s Conditions and Background . 31. 3 .3 Program Area 1 - Establish I/I Program Goals and Targets . 64. 1 .2 Inflow and Infiltration – Background . 33. 3 .3 .1 Establish Overall Program Goals . 64. 1 .3 Impacts of Inflow and Infiltration . 34. 3 .3 .2 Long-Term Water Conservation Strategy . 65. 1 .4 Relationship with Water Opportunities Act (Bill 72) . 35. 3 .3 .3 Establish Audit and Measures Procedures . 65. 3 .3 .4 GIS Mapping and Attributes . 73. 1 .5 Demonstrating Municipal Leadership . 36. 3 .4 Program Area 2 - Monitor and Analyze Flows . 75. 1 .6 Asset Management Principals . 36. 3 .4 .1 Flow & Rainfall Monitoring Program . 79. 1 .7 Description of the Regional and Local 3 .4 .2 Analyze Flow and Rain Data . 79. Municipal Sewerage System Description . 37. 3 .4 .3 Identify Catchments above Thresholds . 84. 1 .7 .1 York-Durham Sewage System (YDSS) . 38. 3 .4 .4 Refine Targets for Non-Conformance . 85. 1 .7 .2 Overall Sewer System Profile . 38. 3 .4 .5 Flow Monitor New Developments . 86. 1 .8 Knowledge of the Physical System 3 .5 Program Area 3 - Investigate and Mitigate . 87. (Data Inventory) . 39. 3 .5 .1 Mini Basin Flow Monitoring . 87. 3 .5 .2 Mini Basin Analyze Flow and Rain Data . 88. 1 .9 Knowledge of the System Hydraulics . 40. 3 .5 .3 Identify Condition Assessment Programs . 89. 1 .9 .1 The Region’s Operations and Emergency 3 .5 .4 Condition/Performance Data Assessments . 90. Procedures for Overflows . 40. 3 .5 .5 Project Planning and Prioritization . 90. 1 .10 Design Standard of the new 3 .5 .6 Project Delivery & Flow Reduction Southeast Collector Trunk Sewer (SEC) . 41. Assessments . 92. 1 .11 System Growth . 41. 3 .5 .7 Update I/I Reduction Achieved . 93. 3 .5 .8 External Asset Management Condition 1 .12 Previous Regional I/I Reduction Pilot Assessment Programs . 94. Program Efforts . 43. 3 .5 .9 Bylaw Enforcement . 106. 1 .13 The Region and Local Municipal Inflow and 3 .6 Program Area 4 - New Developments & Infiltration Reduction Pilot Program - Phase 1 . 45. Capital Projects . 108. 1 .13 .1 Background Assessment and Review 3 .6 .1 Design and Construction Standards (2007-2010) . 45. (Capital & Subdivision) . 108. 1 .13 .2 Flow and Rainfall Measurement 3 .6 .2 Site Plans and Service Permits . 110. and Analysis . 46. 3 .6 .3 Commissioning & Assumption, 1 .13 .3 Flow and Monitoring Data Analysis . 47. Inspection and Testing Procedures . 111. 1 .13 .4 I/I Detection (Sanitary Sewer Evaluation Studies (SSES) Inspection Activities) . 48. 3 .7 Program Area 5 - Financial Management . 112. 1 .13 .5 Establish Pilot Projects & Rehabilitation . 48. 3 .7 .1 Establish and Manage Cost Sharing 1 .13 .6 Post Construction Flow Monitoring . 49. Reserve Fund . 113. 3 .7 .2 Establish and Maintain I/I and Water 2 . 2011 – 2031 Strategy Development . 51. Conservation Programs . 113. 3 .7 .3 Strategic Action Plan . 114. 2 .1 Formation of Water and Wastewater Task Force Steering Committee & Working Groups . 51. 2 .2 Southeast Collector Advisory Committee (SeCAC) Review . 53. 2 .3 Peer Review of Strategy . 53. 2 .4 Industry Engagement . 53. 2 .5 Industry Best-in-Class Review . 54. 2 .5 .1 Observations and Conclusions from the Best-in-Class Review . 56. 2 .5 .2 Best-in-Class Adopted Practices . 57. The Regional Municipality of York Table of Contents 3 .8 Program Area 6 – Communication, List of Figures Education and Advocacy . 114. 3 .8 .1 Region and Local Municipal Internal Figure 1 Sources of Inflow and Infiltration . 33. Communications . 115. Figure 2 Map Illustrating York Region and the 3 .8 .2 Public Education and Outreach . 116. Location of Local Municipalities . 37. 3 .8 .3 Industry Communication and Outreach . 117. Figure 3 YDSS System Profile . 38. 3 .8 .4 Provincial Advocacy . 118. Figure 4 York-Durham Sewage System Map . 42. 3 .8 .5 Sustainable Neighbourhood Retrofit Figure 5 Short-Term Program Timeline . 44. Action Plan (SNAP) . 118. Figure 6 Long-Term Timeline . 44. Figure 7 I/I Reduction Pilot Program Framework . 45. 3 .9 Program Area 7 - Report I/I Reduction . 119. Figure 8 Water and Wastewater Task Force 3 .9 .1 Develop and Maintain Strategy . 119. Steering Committee and Working Group 3 .9 .2 Municipal Report to Region . 120. Organization Chart . 52. 3 .9 .3 Council Reporting . 121. Figure 9 Program Areas and Activities Matrix . 62. 3 .9 .4 Annual Report of Reduction to MOE . 121. Figure 10 Volumetric Reduction . 66. 3 .10 Program Area 8 - Continuous Improvement . 122 Figure 11 Sewershed Delineation . 67. 3 .10 .1 Climate Change Impacts . 123. Figure 12 Timeline for Achieving Goals . 68. 3 .10 .2 Refine Flow Monitoring Standards . 124. Figure 13 Excerpt from the Audit Process Spreadsheet . 71. 3 .10 .3 Implement Rehabilitation Standards . 124. Figure 14 I/I Volume vs . Rainfall Depth . 72. 3 .10 .4 Develop/Update Bylaws and Building Codes . 125 Figure 15 Peak Flow Intensity Graph . 81. 3 .10 .5 Refine Inspection Standards . 126. Figure 16 Catchment Analysis . 82. 3 .10 .6 Private Property Mitigation Programs . 126. Figure 17 Description of Wet Weather 3 .10 .7 Review and Update Strategy . 129. Components and Values . 82 Figure 18 SSES Inspection Thresholds . 88. 4 .Conclusions . 131. Figure 19 XY Severity Matrix . 88. Figure 20 SSES Decision Tree . 89. Appendix A – Audit and Measures Figure 21 Communication, Education, and Procedures Document . 133. Advocacy Stakeholders . 115. Figure 22 Sample Annual Municipal Report . 120. Appendix B – Municipal I/I Annual Report . 145. Figure 23 Sources of Infiltration/Inflow from Private and Public Property . 127. List of Tables Table 1 Summary of Sanitary Sewer Overflows (the Region Sanitary Sewer System) . 40. Table 2 Threshold Limits for I/I Analysis . 47 Table 3 2011/2012 Pilot Projects . 49. Table 4 SeCAC Schedule of Events . 53. Table 5 International Best-in-Class Scan Survey Matrix . 55. Table 6 Best-in-Class Review Applied to the Region . 58. Table 7 Geographic Delineation of the York-Durham Sewage System . 67. Table 8 Factors and Thresholds . 84. Table 9 Individual Event Analysis . 84. Inflow and Infiltration Reduction Strategy Glossary of Terms and Acronyms BI Base Infiltration O&M Operations and Maintenance BILD Building Industry and Land Development PACP Pipeline Assessment Certification Association Program CCTV Closed Circuit Television PF Peak Flow DWF Dry Weather Flow QA/QC Quality Assurance and Quality Control GIS Geographical Information System RDII Rainfall Derived Inflow and Infiltration GTSWCA Greater Toronto Sewer and Watermain ROE Right of Entry Contractors Association SEC Southeast Collector Trunk Sewer GWI Groundwater Infiltration SeCAC Southeast Collector Advisory Committee I/I Inflow and Infiltration SPS Sewage Pumping Station IDF Intensity-Duration-Frequency Curves SSES Sanitary Sewer Evaluation Study IEA Individual Environmental Assessment SSO Sanitary Sewer Overflow MLD Mega Litres Per Day USEPA United States Environmental MOE Ministry of the Environment of Protection Agency the Province of Ontario WPCP Water Pollution Control Plant MMSD Metropolitan Milwaukee WRc Water Resources Council Sewerage District WWF Wet Weather Flow OBC Ontario Building Code YDSS York-Durham Sewage System OCPA Ontario Concrete Pipe Association The Regional Municipality of York Inflow and Infiltration Reduction Strategy At a Glance inflow Water from rainfall or snow melt that enters the sewage system through direct sources such as yard, roof and downspouts, cross-connections with storm drains, foundation drains, and manhole covers . The Regional Municipality of York 1 Inflow and Infiltration Reduction Strategy At a Glance infiltration groundwater that enters through holes and cracks in manholes, laterals, and sewer pipes The Regional Municipality of York 3 Inflow and Infiltration Reduction Strategy At a Glance the problem Excessive inflow and infiltration can result in sewer backups, system overflows, risks to health, damage to the environment, and increased costs . The Regional Municipality of York 5 Inflow and Infiltration Reduction Strategy At a Glance 20 years The implementation will commence in April 2011 and is anticipated to continue as a sustained program over the next 20 years . The Regional Municipality of York 7 Executive Summary Wastewater servicing is Wastewater servicing is multi-jurisdictional based on a two-tier municipal governance structure. multi-jurisdictional based Sewage from most of the communities in the on a two-tier municipal Region is collected through a combination of local municipal and Regional sewer systems. The Region is governance structure . responsible for major pumping stations, trunk sewers, Sewage from most of and treatment plants. The local municipalities provide direct collection and management of the local system the communities in the infrastructure and wastewater flows into the Regional Region is collected through trunk system. In addition, private property owners are responsible for wastewater mains and service laterals a combination of local within their property. municipal and Regional On March 31, 2010, the Minister of the sewer systems . Environment (the Minister) approved