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Livable Region Strategy Plan Review towards 2031 Infrastructure Integrity and Climate Change: Metro Vancouver Case Study APEGGA Professional Development.

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Presentation on theme: "Livable Region Strategy Plan Review towards 2031 Infrastructure Integrity and Climate Change: Metro Vancouver Case Study APEGGA Professional Development."— Presentation transcript:

1 Livable Region Strategy Plan Review towards 2031 Infrastructure Integrity and Climate Change: Metro Vancouver Case Study APEGGA Professional Development Sessions Infrastructure Integrity – Climate Change Impacts and Adaptation Shaw Conference Centre, Edmonton, Alberta April 18, 2008 ???????? Brent Burton, M.A.Sc., P.Eng. Utility Analysis and Environmental Management Division Policy and Planning Department Metro Vancouver

2 Livable Region Strategy Plan Review towards 2031 Outline Background on Metro Vancouver Background on Metro Vancouver Existing role in water supply and wastewater Existing role in water supply and wastewater Adaptation and Metro Vancouver Adaptation and Metro Vancouver Metro Vancouver sewerage case study Metro Vancouver sewerage case study Next Steps Next Steps

3 Livable Region Strategy Plan Review towards 2031 Metro Vancouver Common name of several legal entities including Greater Vancouver Water District and Greater Vancouver Sewerage and Drainage District Common name of several legal entities including Greater Vancouver Water District and Greater Vancouver Sewerage and Drainage District Partnership of 21 municipalities and one electoral area Partnership of 21 municipalities and one electoral area Board comprises elected officials from member municipalities Board comprises elected officials from member municipalities Services a population exceeding two million (projected 2.7 million by 2027) and a land area of approx 280,000 ha Services a population exceeding two million (projected 2.7 million by 2027) and a land area of approx 280,000 ha

4 Livable Region Strategy Plan Review towards 2031 Role of Metro Vancouver Delivery of utility services most effectively and efficiently provided on a regional basis Delivery of utility services most effectively and efficiently provided on a regional basis Protection and enhancement of quality of life in the region Protection and enhancement of quality of life in the region

5 Livable Region Strategy Plan Review towards 2031 Role in water supply Supply water to most of region from three mountain reservoirs Supply water to most of region from three mountain reservoirs Reservoirs are typically spilling about 9 months a year Reservoirs are typically spilling about 9 months a year High demand in summer (outdoor water use) High demand in summer (outdoor water use) Largely supplied by gravity during winter Largely supplied by gravity during winter

6 Livable Region Strategy Plan Review towards 2031 Role in wastewater Maintain and operate major interceptor sewers Maintain and operate major interceptor sewers Maintain and operate 5 treatment plants Maintain and operate 5 treatment plants AAD (MLD) = 603 AAD (MLD) = 11 AAD (MLD) = 510 AAD (MLD) = 98 AAD (MLD) = 78

7 Livable Region Strategy Plan Review towards 2031 Liquid waste planning Policies and commitments identified in Liquid Waste Management Plan (approved by Province in 2002) Policies and commitments identified in Liquid Waste Management Plan (approved by Province in 2002) Climate change not specifically identified in LWMPClimate change not specifically identified in LWMP Currently undergoing regularly-scheduled 5-year review and update Currently undergoing regularly-scheduled 5-year review and update

8 Livable Region Strategy Plan Review towards 2031 Metro’s role and climate change adaptation Mitigation activities (GHG reduction) already well established by late 90s via air quality role, but… Mitigation activities (GHG reduction) already well established by late 90s via air quality role, but… Awareness of need for adaptation still developing Awareness of need for adaptation still developing Adaptation issues first formally reviewed in an overview in 2000: Adaptation issues first formally reviewed in an overview in 2000: Adaptation Strategies for Utility Planning (Environment Canada)Adaptation Strategies for Utility Planning (Environment Canada) Identifies climate projections and briefly outlines potential impacts (rising sea levels, spring flooding, summer drought, etc.) Identifies climate projections and briefly outlines potential impacts (rising sea levels, spring flooding, summer drought, etc.)

9 Livable Region Strategy Plan Review towards 2031 Metro’s role and climate change adaptation for wastewater infrastructure Focus on precipitation analysis for wastewater systems in 2002 Focus on precipitation analysis for wastewater systems in 2002 Development of GVRD Precipitation Scenarios (KWL Consulting)Development of GVRD Precipitation Scenarios (KWL Consulting) Comprehensive analysis of historical precipitation and future projections,Comprehensive analysis of historical precipitation and future projections, Identifies patterns of increased rainfallIdentifies patterns of increased rainfall But likely yet “…no urgent need to upgrade the capacity of combined sewers, storm sewers and drainage systems.”But likely yet “…no urgent need to upgrade the capacity of combined sewers, storm sewers and drainage systems.” But situation needs to be monitored and periodically re-assessed…But situation needs to be monitored and periodically re-assessed…

10 Livable Region Strategy Plan Review towards : Increasing recognition of need for adaptation in engineering practice

11 Livable Region Strategy Plan Review towards : Drinking Water Management Plan A number of recent studies used to identify climate change impacts / adaptationsA number of recent studies used to identify climate change impacts / adaptations Some impacts / adaptations related to ensuring sufficient water stored for summer months and increased efforts at DSMSome impacts / adaptations related to ensuring sufficient water stored for summer months and increased efforts at DSM Climate change may move forward the date when storage increase required (i.e. dam raising, lower intakes and alpine lakes) by approximately 10 years.Climate change may move forward the date when storage increase required (i.e. dam raising, lower intakes and alpine lakes) by approximately 10 years.

12 Livable Region Strategy Plan Review towards 2031 And then there was 2007… IPCC report released early in the year IPCC report released early in the year GVRD Historical and Future Rainfall Analysis Update (Pacific Climate Impacts Consortium) GVRD Historical and Future Rainfall Analysis Update (Pacific Climate Impacts Consortium) Generally affirms KWL conclusionsGenerally affirms KWL conclusions Identifies more evidence of statistically-significant trends of increased rainfall (especially short duration storms in spring)Identifies more evidence of statistically-significant trends of increased rainfall (especially short duration storms in spring) Political Board requests update on adaptation activities Political Board requests update on adaptation activities

13 Livable Region Strategy Plan Review towards 2031 Engineers Canada and vulnerability assessments Staff membership on Water Resources Expert Working Group and Stormwater / Wastewater Expert Working Group Staff membership on Water Resources Expert Working Group and Stormwater / Wastewater Expert Working Group Staff determined that wastewater vulnerability assessment needed most urgently Staff determined that wastewater vulnerability assessment needed most urgently At staff request, Board approves partnership with Engineers Canada in study of wastewater infrastructure vulnerability At staff request, Board approves partnership with Engineers Canada in study of wastewater infrastructure vulnerability

14 Livable Region Strategy Plan Review towards 2031 Initiating vulnerability assessment Agreement developed between Metro Vancouver and Engineers Canada Agreement developed between Metro Vancouver and Engineers Canada Working with Engineers Canada, staff issued Request for Proposal focussing on Vancouver Sewerage Area Working with Engineers Canada, staff issued Request for Proposal focussing on Vancouver Sewerage Area KWL Consulting awarded contract KWL Consulting awarded contract Lead: Andrew Boyland, P.Eng. Lead: Andrew Boyland, P.Eng. Associated Engineering Associated Engineering Treatment Sub-Consultant Treatment Sub-Consultant Dean Shiskowski, Ph.D, P.Eng. Dean Shiskowski, Ph.D, P.Eng.

15 Livable Region Strategy Plan Review towards 2031 Local Geography of VSA Burrard Inlet Strait of Georgia Fraser River North Shore Mountains Iona Island WWTP

16 Livable Region Strategy Plan Review towards 2031 Quick Facts: Vancouver Sewerage Area Service Population: 600,000 Service Population: 600,000 Service Area: 13,000 ha Service Area: 13,000 ha Predominantly serviced by combined sewers Predominantly serviced by combined sewers Combined sewer overflows during wet weatherCombined sewer overflows during wet weather Approximately 40% serviced by separated sanitary sewers Approximately 40% serviced by separated sanitary sewers Wastewater drains to Iona Island Wastewater Treatment Plant Wastewater drains to Iona Island Wastewater Treatment Plant As well as City of Vancouver, VSA includes all of UBC and part of the cities of Burnaby and Richmond As well as City of Vancouver, VSA includes all of UBC and part of the cities of Burnaby and Richmond

17 Livable Region Strategy Plan Review towards 2031 Regional collection system

18 Livable Region Strategy Plan Review towards 2031 Located in a west-coast marine climate zone Located in a west-coast marine climate zone Regional climate highly influenced by El Nino Southern Oscillation and Pacific Decadal Oscillation (additive or mitigating) Regional climate highly influenced by El Nino Southern Oscillation and Pacific Decadal Oscillation (additive or mitigating) Generally subject to west to east weather patterns Generally subject to west to east weather patterns Winter climate dominated by repeated cyclonic storms (long duration precipitation of moderate intensity)Winter climate dominated by repeated cyclonic storms (long duration precipitation of moderate intensity) Rainfall Rainfall Annual rainfall is typically about 1,800 mmAnnual rainfall is typically about 1,800 mm One day maximum rainfall about 73.1 mmOne day maximum rainfall about 73.1 mm Typically highly variable through region due to geographyTypically highly variable through region due to geography Temperatures Temperatures January temperatures average about -0.6 to 5 deg C.January temperatures average about -0.6 to 5 deg C. August temperatures average about 11 to 23 deg C.August temperatures average about 11 to 23 deg C. Climate Quick Facts: Vancouver Sewerage Area

19 Livable Region Strategy Plan Review towards 2031 Sewer separation is major long-term strategy outlined to address CSOs Sewer separation is major long-term strategy outlined to address CSOs Commitment to eliminate CSOs by 2050 with interim rates of sewer separationCommitment to eliminate CSOs by 2050 with interim rates of sewer separation Most regional sewers, once fully separated, would be transferred to City ownershipMost regional sewers, once fully separated, would be transferred to City ownership Iona upgrade to secondary by 2020 Iona upgrade to secondary by 2020 Iona to maintain 17 m 3 /s peak flow capacity Iona to maintain 17 m 3 /s peak flow capacity Quick Facts on Liquid Waste Management Plan

20 Livable Region Strategy Plan Review towards 2031 Infrastructure components considered upstream of treatment plant Wastewater Infrastructure and Collection System Wastewater Infrastructure and Collection System Combined Sewer Trunks Combined Sewer Trunks Pump Stations & Wet Wells Pump Stations & Wet Wells Force Mains Force Mains Siphons Siphons Outfalls Outfalls Manholes Manholes Flow & Level MonitorsFlow & Level Monitors Grit ChambersGrit Chambers Flow Control StructuresFlow Control Structures Control ValvesControl Valves Air ValvesAir Valves

21 Livable Region Strategy Plan Review towards 2031 Iona Island Wastewater Treatment Plant Began operating in 1963 Began operating in 1963 Primary treatment Primary treatment Current plan is to upgrade to secondary by 2020Current plan is to upgrade to secondary by 2020 Discharges through a 7 km deep sea outfall to Strait of Georgia (90 m below sea level) Discharges through a 7 km deep sea outfall to Strait of Georgia (90 m below sea level) 2007 AAD = 603 MLD 2007 AAD = 603 MLD

22 Livable Region Strategy Plan Review towards 2031 Infrastructure components considered at treatment plant Process, hydraulic and supporting infrastructure Process, hydraulic and supporting infrastructure Screening Screening Influent pumping Influent pumping Grit removal Grit removal Primary clarification Primary clarification Sludge thickening Sludge thickening Sludge digestion Sludge digestion Sludge lagoons Sludge lagoons Treatment liquid streamTreatment liquid stream Effluent disposal Effluent disposal On-site pipelines On-site pipelines Buildings, tankage and housed process equipment Buildings, tankage and housed process equipment Standby generators Standby generators

23 Livable Region Strategy Plan Review towards 2031 Timelines and general climate factors Focus on 2020 and 2050 (i.e. no 2080 scenario) Focus on 2020 and 2050 (i.e. no 2080 scenario) Climate modelling by OURANOS suggested that by 2020 and, to a greater extent by 2050, we can expect: Climate modelling by OURANOS suggested that by 2020 and, to a greater extent by 2050, we can expect: Increased rainfall, including more frequent and more intense rainfall eventsIncreased rainfall, including more frequent and more intense rainfall events Rises in the sea levelRises in the sea level Increases in storm surge, floods and extreme gustsIncreases in storm surge, floods and extreme gusts

24 Livable Region Strategy Plan Review towards 2031 Detail climate factors 2050 Horizon 2050 Horizon *Intense Rain – (24 hr – 73mm) ➚ 17% increase*Intense Rain – (24 hr – 73mm) ➚ 17% increase *Annual Rain – (1881mm) ➚ 14% increase*Annual Rain – (1881mm) ➚ 14% increase *Sea Level – 0.3 – 1.6m (2080 Horizon) increase*Sea Level – 0.3 – 1.6m (2080 Horizon) increase *Storm Surge – N/A, expected increase*Storm Surge – N/A, expected increase Temperature – 1.4 – 2.8c increaseTemperature – 1.4 – 2.8c increase Drought – no change (20 days)Drought – no change (20 days) Wind – N/A, expected increaseWind – N/A, expected increase

25 Livable Region Strategy Plan Review towards 2031 Climate factors Snowfall – decrease Snowfall – decrease Frost, Ice, Freeze Thaw – decrease Frost, Ice, Freeze Thaw – decrease Other Effects: Other Effects: Flooding – Fraser River - decrease (?) Flooding – Fraser River - decrease (?) Ground Subsidence – 2mm/yr Ground Subsidence – 2mm/yr Data Gaps: Data Gaps: Rainfall IDF curves, shorter durationsRainfall IDF curves, shorter durations Wind, Storm SurgeWind, Storm Surge

26 Livable Region Strategy Plan Review towards 2031 Key Vulnerabilities Key Vulnerabilities Key Vulnerabilities Combined Sewer Overflows (CSO)Combined Sewer Overflows (CSO) Intense rain, annual rain Intense rain, annual rain WWTP FloodingWWTP Flooding Combined effects of storm surge, sea level rise and subsidence Combined effects of storm surge, sea level rise and subsidence Effluent Disposal – outfall/jetty structureEffluent Disposal – outfall/jetty structure Storm surge, wind/wave effects Storm surge, wind/wave effects Photo: Corporation of Delta

27 Livable Region Strategy Plan Review towards 2031 Detail vulnerabilities

28 Livable Region Strategy Plan Review towards 2031 Policy Recommendations Important to use this information in: Important to use this information in: Review and update of the Liquid Waste Management Plan (i.e. regional design standards / commitments related to climate change, reaffirming commitments to green infrastructure?)Review and update of the Liquid Waste Management Plan (i.e. regional design standards / commitments related to climate change, reaffirming commitments to green infrastructure?) Next phase of treatment upgrading (i.e. designing secondary treatment to accommodate sea level rise and storm surge)Next phase of treatment upgrading (i.e. designing secondary treatment to accommodate sea level rise and storm surge) Reaffirming timelines and commitments to sewer separationReaffirming timelines and commitments to sewer separation

29 Livable Region Strategy Plan Review towards 2031 Technical recommendations Further study suggested to determine increase in sewer flows Further study suggested to determine increase in sewer flows Further study suggested to determine if additional sewer separation effort required to eliminate CSOs by 2050 Further study suggested to determine if additional sewer separation effort required to eliminate CSOs by 2050 Identify stand-by power requirements Identify stand-by power requirements Assess potential for WWTP flooding Assess potential for WWTP flooding

30 Livable Region Strategy Plan Review towards 2031 Cross-cutting issues (?) for other communities Combined Sewers may have ‘built-in’ adaptive capacity. Combined Sewers may have ‘built-in’ adaptive capacity. Designed to overflow in controlled mannerDesigned to overflow in controlled manner Many built when sizing was empirical. (i.e. big enough for a person to walk through)Many built when sizing was empirical. (i.e. big enough for a person to walk through) Mitigation of CSOs and reduction of risk consistent with sewer separation and can be consistent with adaptation (if new climate data considered)Mitigation of CSOs and reduction of risk consistent with sewer separation and can be consistent with adaptation (if new climate data considered) Climate data uncertainty Climate data uncertainty Regional models unable to account for local effects (wind speed & direction, storm surge, extremely variable geography)Regional models unable to account for local effects (wind speed & direction, storm surge, extremely variable geography) Expense/practicality limited the model runs to two initial conditions (same GHG scenario)Expense/practicality limited the model runs to two initial conditions (same GHG scenario)

31 Livable Region Strategy Plan Review towards 2031 Cross-cutting issues (?) Infrastructure vulnerability issues more cross-cutting than climate change factors?Infrastructure vulnerability issues more cross-cutting than climate change factors? i.e. climate change factors possibly only relevant to Vancouver (mild coastal effects), but the “infrastructure deficit” is more cross-cuttingi.e. climate change factors possibly only relevant to Vancouver (mild coastal effects), but the “infrastructure deficit” is more cross-cutting Process highlights ongoing management actionsProcess highlights ongoing management actions i.e. complete emergency response plan, review standby power availabilityi.e. complete emergency response plan, review standby power availability Design assumptions for very old infrastructure often not readily availableDesign assumptions for very old infrastructure often not readily available i.e. to determine basis of capacityi.e. to determine basis of capacity

32 Livable Region Strategy Plan Review towards 2031 Next steps for Metro Staff Report to Regional Engineers Advisory CommitteeReport to Regional Engineers Advisory Committee Consists of most senior engineer from each member municipalityConsists of most senior engineer from each member municipality Discuss and finalize technical recommendationsDiscuss and finalize technical recommendations Report to Waste Management Committee and BoardReport to Waste Management Committee and Board With recommendation for further actions and studies for this and other aspects of our utilitiesWith recommendation for further actions and studies for this and other aspects of our utilities Major policy decisions ($$$) need Board approvalMajor policy decisions ($$$) need Board approval

33 Livable Region Strategy Plan Review towards 2031 Questions? Metro Vancouver Sewerage Area Case Study


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