Vulnerability of Metro Vancouver Wastewater Infrastructure to Climate Change

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1 Vulnerability of Metro Vancouver Wastewater Infrastructure to Climate Change Andrew Boyland, P.Eng. Kerr Wood Leidal Associates Arash Masbough, M.A.Sc., PMP, P.Eng. Associated Engineering

2 Today s Presentation Part 1: Introduction Who is PIEVC? What is covered by its vulnerability assessment initiative Part 2: How is it done? Part 3: Case Studies in Metro Vancouver: 1. Vancouver Sewerage Area 2. Fraser Sewerage Area

3 To conduct an engineering assessment of the vulnerability of Canada's public infrastructure to the impacts of climate change Co-funded by Natural Resources Canada (NRCan) and engineerscanada

4 National Engineering Assessment: The Vision Canadian public infrastructure that is designed, operated and maintained in a way that minimizes the risk of destruction, disruption or deterioration due to changing climatic conditions.

5 National Engineering Assessment: The Mission Statement PIEVC will assist the engineering profession in gaining an understanding of the implications of climate change on Canadian public infrastructure, ultimately leading to the development of policies, standards and tools to guide Professional Engineers in their day-to to-day practice.

6 What s VULNERABILIT? The Inter-Governmental Panel on Climate Change (IPCC) defines vulnerability: The degree to which a system is susceptible to, or unable to cope with, adverse effects of climate, including climate variability and extremes.

7 Canada-Wide assessment Pilot Case Studies Buildings Roads and associated structures Storm water and wastewater systems Vancouver Sewerage Area Infrastructure Assessment - Vancouver, British Columbia Water resources

8 Part 2: Protocol Risk Assessment Process Risk Assessment Matrix Technical Aspects of the Subject Project

9 Protocol Phases 1 2 Overall Project Execution Process 3 4 5

10 Protocol Execution

11 Standard Risk Assessment Approach What is the possibility of it occurring Probability Risk Event X What is the impact if it occurs Consequence Severity Impact Risk Ranking

12 Priority Calculation

13 Part 3: Case Studies Climate Change Impact on Metro Vancouver Sewerage Areas Vancouver Sewerage Area (VSA) Fraser Sewerage Area (FSA) Project Team: Kerr Wood Leidal Associates: Sewer System Associated Engineering: Treatment System

14 Metro Vancouver

15 Metro Vancouver Sewerage Areas

17 Case Study No. 1: Vancouver Sewerage Area

18 Vancouver Sewerage Area (VSA) Collection System Components Conveyance Administration/ Operations Electric Power & Communications Maintenance Transportation

19 Climate Change Information Ouranos (Consortium on Regional Climatology and Adaptation to Climate Change) Pacific Climate Impacts Consortium (PCIC) Ministry of Environment Other literature review

20 Iona Island WWTP

21 Probability Scale Factors

22 Severity Scale Factor

23 Table 4-2 Vulnerability Assessment Matrix CLIMATE CHANGE EFFECTS Intense Rain Total Seasonal Rain The Matrix INFRSTRUCTURE COMPONENTS Physical Infrastructure Combined Sewer Trunks /N S C 7 S R 6 P C 42 /N S C 7 S R 3 P C 21 Combined Sewer Interceptors Sanitary Mains Designated Force Mains Siphons Outfalls Pump Stations & Wet Wells Manholes Flow & Level Monitors N Flow Control Structures Grit Chambers

24 Protocol Execution

25 Step 4: Indicator Analysis Process

26 Recommendation Flowchart

27 Data Sufficiency - Identify where there is insufficient data to proceed - Attempt to fill in data with work plan or professional judgment - Where the above is not possible, bring items forward to Step 5 Recommendations

28 Iona Island Wastewater Treatment Facility Process Screening Influent pumping Grit removal Primary clarification Sludge thickening Sludge digestion Sludge lagoons Hydraulics Treatment stream Effluent disposal Systems On-site pipelines Standby generators Buildings, tankage and housed process equipment

29 Example Calculation

30 Engineering Analysis Infrastructure Component COLLECTION SSTEM Combined Sewer Trunks Combined Sewer Interceptors Sanitary Mains TREATMENT (IIWWTP) Effluent Disposal Buildings, Tankage and Housed Process Equipment Climate Variable Intense Rain Intense Rain Intense Rain Storm Surge Storm Surge Priority of Relationship

31 Three Categories of Infrastructure-Climate Interaction 1. PC 36. Strong probability of a severe effect. Go to recommendations < PC > 36.Possibility of a major effect. These effects are considered to be in a gray area, go to Step 4 quantitative analysis 3. PC 12. Unlikely to have much effect. These infrastructure-climate interactions are left aside without further analysis or recommendations.

32 Step 5 Increased pumping heads associated with future surge conditions may reduce the capacity of the existing effluent pumping station. The feasibility of using larger pumps, while potentially able to restore lost capacity, needs to be assessed also in the context of internal pressures in the jetty conduit and marine sections of the outfall.

33 VSA Key Vulnerabilities Combined sewer overflows (CSO) Intense rain, annual rain WWTP flooding Combined effects of storm surge, sea level rise and subsidence Effluent disposal outfall/jetty structure Storm surge, wind/wave effects

35 Case Study No. 2: Fraser Sewerage Area

36 Annacis Island WWTP

37 Key Issues/Recommendations for FSA Annacis Island WWTP Fraser River level rise + storm surge impacts Potential groundwater elevation rise may affect buried structure Sewer Capacity (gravity mains, outfalls, pumps) Increasing I&I in separated sewer during intense rain Distributed wet weather treatment? Hazard Mapping Recommended Integrate water resources, drainage information, critical sites and infrastructure

38 Project Potentials All key core practices in the industry Infrastructure operators, are we adapting? No geographic boundaries Further information: Arash Masbough and Andrew Boyland

39 AKNOWLEDGEMENTS Metro Vancouver: Policy and Planning and Operations and Maintenance Departments Brent Burton PIEVC David Lapp

40 QUESTIONS?

1 Metro Vancouver Case Study Vancouver Sewage Area Infrastructure Vulnerability to Climate Change

1 Metro Vancouver Case Study Vancouver Sewage Area Infrastructure Vulnerability to Climate Change 1.1 Background Within the First National Engineering Vulnerability Assessment, the Public Infrastructure