project background and description for lake st. martin ... · works outlet works reach 3 excavation...
TRANSCRIPT
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Science Imagination Collaboration
Project Background and Description for
Lake St. Martin Outlet Channel
May 9, 2019
Workshop 1: EIS Status
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Presentation Outline
1. Project Background (LMB & LSM projects)
2. Lake St. Martin Outlet Channel Project • Description• Design status• Design considerations• Associated activities and field investigations
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Emergency Reduction of LMB/LSM WL
Range of options and alignments considered Construction of LSM Emergency Channel (Reach 1&3)
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Post 2011 Flood
2011 flood triggered multiple provincial initiatives:• 2011 Flood Review Task Force & LMB/LSM Regulation
Review Committee
– Both studies made specific recommendations for permanent additional outlet capacity from LMB/LSM
• Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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AR and LMB Basins Flood Mitigation Study
3-year study which considered entirety of both Lake Manitoba and Assiniboine River basins
Scope included:• Identification of major flood vulnerabilities
• Hydrologic and hydraulic analyses
• Development of flood protection measures
• Cost estimates and economic analyses
• Environmental & socio-economic considerations (screening)
• Public open house events in Dauphin, Brandon & Portage la Prairie
– June 2013 & Dec 2014
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AR and LMB Basins Flood Mitigation Study
Over 70 potential options
considered
Large Dams
Small Dams
Diversion Outlet Channels
Others (e.g. Dikes, Control
Structures, Individual flood
proofing…)
Study Areas and Flood Mitigation Alternatives Text
• Text
Text
• Text
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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LMB/LSM Outlet Channel Conceptual Design
Stage 1 study completed in conjunction with AR&LMB Basins Flood Mitigation Study
Stage 1 goal: refine outlet options for both lakes• Considerations to work completed during 2011 flood
• Development of screening level designs and cost estimates
• Economic Assessment
• Initial identification of potential environmental concerns
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Lake Manitoba Outlet (Stage 1 Study)
6 alignment options considered
Range in flows from 0 to 15,000 cfs
Options C & D preferred based on cost and environmental rankings
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Lake St. Martin Outlet (Stage 1 Study)
2 alignment options considered for LSM• Both through Big Buffalo
Lake wetland/bog
Range in flows from (4000 to 19 000 cfs)
Both options ranked similarly – WP option tentatively preferred for socio-economic reasons
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2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
Timeline
Province
announces it is
proceeding with
7,500 cfs LMOC &
11,500 cfs LSMOC
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Key Recommendations of Flood Mitigation Study
Expansion of the outlet works at LMB & LSM
Enhancement of Lower Assiniboine River Dikes
Expansion of Portage Diversion
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Stage 2 Conceptual Design
Advancement of conceptual design based on conclusion of Stage 1 study
Supplemental field investigations
Environmental screening
Conceptual cost estimates and schedule
Additional open house event (Ashern – Sept. 2014)
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Lake Manitoba Outlet (Stage 2 Study)
Refinement of alignments
Key issue:
• Risks associated with potential groundwater impacts on Route C
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Lake St. Martin Outlet (Stage 2 Study)
Refinement of alignments
Key Issue • Risks associated with
water flowing over bog area and surrounding Big Buffalo Lake (plugging due to floating peat)
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Preliminary Engineering for LMB Options C&D
Scope of work included:• Drilling and monitoring
program
• Groundwater study
• Surface water study
• Geotechnical investigations and analyses
• Risk Assessment
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Preliminary Engineering for LMB Options C&D
Evaluation Process:• Technical workshop
• Weighting of criteria and rating of options
• Suitability of the options in meeting project objectives
• Performance of one option relative to the other
Option D scored highest and identified as preferred option • Groundwater impacts and risks were the major factors
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Preliminary Engineering for LMB Options C&D
Based stakeholder input, additional Option “G” considered
Concluded to have similar concerns to Option C
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Preliminary Design of Reach 2 of the LSMOC
Scope of work included:• Field Investigations
• Constructability
• Operational risks
• Environmental comparison
• Maintenance and inspection
• Cost Estimates
• Evaluation of options
• Preliminary Design
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Preliminary Design of Reach 2 of the LSMOC
Evaluation Process:• Technical workshop
• Weighting of criteria and rating of options
Option 4 scored highest and identified as preferred option • Risks associated with Big Buffalo lake wetland complex
was the major factor (Options 1&2 not preferred)
• Constructability, O&M, costs (Option 4 over Option 3)
• Repurpose or decommission Reach 1
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Timeline
2011 Flood
Analysis of Options for Emergency Reduction of LMB & LSM Water Levels
(KGS Group & AECOM)
Construction of LSM Emergency Channels (Reach 1 & 3)
(KGS Group & AECOM)
2011 Flood Review Task Force & LMB/LSM Regulation Review Committee
(Farlinger & Westdal)
Assiniboine River and Lake Manitoba Basins Flood Mitigation Study
(KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 1
Refine Alternatives (KGS Group)
LMB & LSM Outlet Channels Conceptual Design Stage 2
Detailed Review of Preferred Alternatives (KGS Group)
Investigations and Preliminary Engineering for LMOC Options C&D
(KGS Group)
Preliminary Design for Reach 2 of the LSMOC
(KGS Group)
Current Project - LMOC & LSMOC Design
(KGS Group & Hatch)
Now
2017 2018 20192011 2012 2013 2014 2015 2016
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Lake St. Martin Outlet Channel Project
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Lake St. Martin Outlet Channel Description
Reach 3 (expansion of
existing)
InletWorks
Outlet
Works
Reach 3excavation
Reach 2excavation
Drop
Structures
Water Control
Structure
Temporary
Winter Road
Design continues to evolve
Alignment is fixed
Profile being updated
Number, location & type of drop structures under review
WCS location may change
Permanent
Access Road
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Channel Profile (Current Status)
Top of dike
Top of peat
Design water
surface Top of Till
Bedrock
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Channel Profile (Current Status)
Top of dike
Top of peat
Standing water in
channel when not
in operation
Design water
surface
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Standing Water in Channel (min. 1m depth)
Minimizes potential for fish kill due to ice growth and anoxic conditions (need base flow) for stranded fish.
Reduces extents of channel side slopes exposed to risk of poor vegetation growth due to prolonged wet/dry cycles.
Minimizes potential risk of extensive vegetation growth in channel base that could reduce channel capacity.
Minimizes potential for damage to drop structures and channel erosion due to ice growth in winter.
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Drop Structures
Rockfill structure (D50 ~400mm)
U/S fish passage not a design requirement
Notch included at crest to promote D/S fish passage
Alternate options under considerations (e.g. concrete vertical drop structure)
Considerations to winter flows and operating guidelines
76m wide
2-3m high
2-3m drop
~100m length
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Typical Cross Section
44 m wide
4.5m depth (approx.) at 11,500 cfs
Top of peat
Top of till
4:1
~10H:1V Scale
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Typical Cross Section
Top of peat
Top of till
Dike height
will vary
Min. 1m
freeboard at
11,500 cfs
~10H:1V Scale
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Typical Cross Section
Top of peat
Top of till
~10H:1V Scale
Access road on both sides
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Typical Cross Section
Top of peat
Top of till
~10H:1V Scale
Spoil pile size
and position
may vary
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Typical Cross Section
Top of peat
Top of till
~10H:1V Scale
Spoil pile size
and position
may vary
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Typical Cross Section
Top of peat
Top of till
~10H:1V Scale
Likely location of
permanent outside
drain on east side
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Surface Water Drainage
Outside drain to be included on east side
Discharge into channel at predetermined locations
Extents of peat drainage will vary
Drainage requirements on west side under review
Existing pathways
of surface runoff
(typical)
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Water Control Structure
Concept design sketch
Currently studying configuration and hoist type
Similar structure on LMOC
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Water Control Structure6-bay Structure – Was required on previous Reach 1 alignment
due to backwater from Big Buffalo
Lake & surrounding peatland areaLake
St. Martin
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Water Control Structure2-bay Structure – for current alignment by reducing tailwater
Lake
St. Martin
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Water Control Structure2-bay Structure – for current alignment by reducing tailwater
Lake
St. MartinPotential alternate location
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Inlet Works
243.20 m
(median)
243.15 m (design)Excavated
Inlet
Design ongoing
Lakebed excavation required to achieve design capacity
Studying shoreline processes • stable environment
Jetties
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Outlet Works
Jetties
Typical Lake Winnipeg Level
Excavated
Outlet
Design ongoing• minimize footprint
Studying shoreline processes• dynamic environment
Key considerations:• potential for erosion
• potential for sedimentation
• impacts to shoreline geomorphology
• Design storm / water level
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Completed Field Investigations
Pre 2019 data:• 700+ peat probes
• ~50 hand augers
• ~50 test holes
• ~120 test pits
• ~25 km seismic
• LiDAR
• Bathymetry
• Surveys
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Completed Field Investigations
2019 winter investigations:• 19 test hole locations
• 3 channel pump wells
• 1 sentinel well at DRFN
• 8 test pits
• Seismic surveys (7.4 km)
• Topographic surveys
Lab Testing (In progress)• Water Quality – Routine inorganic,
dissolved metals, stable isotope and low range tritium.
• Soils - M/C, Atterberg, Grain Size Analysis, Standard Proctor, Direct Shear
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Field Investigations Update
Preliminary Stratigraphic Profile
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Groundwater
Reach 3 – channel bedrock exposed during emergency channel construction in 2012o Result: drop in bedrock piezometric pressure; there is seepage
baseflow
Reach 3 is a bedrock aquifer discharge area - channel design goals: o Maintain condition
o Mitigate increasing pressures due to elevated flood stage profiles
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Estimated Bedrock Piezometric Pressure
Artesian
groundwater
spring sites
(typical)
Estimated bedrock
piezometric
pressure contours
Channel bedrock
exposed
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Rock Availability Assessment
Studying quality/quantity of rock available for riprap
Alternate sites under consideration
Various testing ongoing
Existing
Access Road
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Upcoming Spring/Summer Field Activities
Rock Availability (inspection, monitoring & drilling)
Shoreline Morphology (inspection, bathy. & substrates)
Groundwater monitoring and sampling (multiple sites along
channel alignment)
Sentinel well installation & monitoring (Dauphin River)
Revegetation surveys and investigations (see next slides)
Fairford river and Dauphin River flow systems survey (tentative – see next slides)
Weather station (tentative)
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Revegetation Surveys
Base survey:• Vegetation types / unique species & landscape
• Sources of plant material
• Soil conditions
Revegetation field trials• Evaluate vegetation performance under various controlled
conditions
• Strengthen confidence in the revegetation design
• Multiple plots to test varying seed mixes and soil amendments
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Fairford River and Dauphin River Flow System
Outlet Channels will alter the flow regime of the Dauphin / Fairford Rivers.
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Phased surveys to support modelling and assessments • fluvial geomorphology
• water retention times
• river ice processes
Fairford River and Dauphin River Flow System
Dauphin River
Lake Pineimuta
Delta
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Science Imagination Collaboration