january 29, 2013 lake diefenbaker reservoir operation proposed operating manual development
TRANSCRIPT
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January 29, 2013
Lake Diefenbaker Reservoir OperationProposed Operating Manual Development
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Outline• Background• About Lake Diefenbaker• Typical Operations • 2010/11 Operations• University of Saskatchewan Review of 2010/11 Operations• 2012 Stakeholder Engagement• Reservoir Operations Manual Template • Proposed Process for Lake Diefenbaker ROM
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Background• WSA responsible for operation and maintenance of 45 dams,
control structures and/or weirs. • Provincial 25 Year Saskatchewan Water Security Plan calls
for review and update of reservoir operating plans (now operating manuals) on a priority basis
• Government has committed to completing ROM for Lake Diefenbaker be early 2014.
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Lake Diefenbaker Specifications
Reservoir Design Full Reservoir Design Full Supply Level (FSL)Supply Level (FSL)
556.87 metres556.87 metres
Effective drainage Effective drainage areaarea
126,000 km126,000 km22
Maximum depthMaximum depth 58 metres at FSL58 metres at FSL
LengthLength 225 km at FSL225 km at FSL
AreaArea 43,000 hectares at 43,000 hectares at FSLFSL
Storage at FSLStorage at FSL 9,400,000 dam9,400,000 dam3 3
(total)(total)
4,300,000 dam4,300,000 dam3 3 (live)(live)
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Operation Targets for Lake Diefenbaker
Minimum
545
546
547
548
549
550
551
552
553
554
555
556
557
558
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Full Supply Level = 556.87 m
Minimum
Maximum
Target Elevations
(1) West Side Pumping Plant 549.86 m(2) Grainland W.U.A. 550.47 m(3) Miry Creek W.U.A. 551.41 m(4) Elbow Harbour 552.00 m(5) July 1 Piping Plover Target 555.00 to 555.30 m
(5)
(1)
(2)
(3)
(4)
Daily Mean
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542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
0
500
1000
1500
2000
2500
Inflow
Outflow
Upper Quartile Inflow
Elevation
Median Elev
Diefenbaker Lake 2010 to 2011(Inflow, Outflow, Elevation)
1 2 31,2,3 Three reductions for S'toon Pipeline
2 Units Full
Reduced Outflow to Avoid Spilling on SaskRiver Hydro
Well Above Upper Quartile Prairie Inflow
1st 2011 Alta Rain Event
2nd,3rd Alta RainWell Above
Upper Quartile Summer Inflow
Started Spill May 2, 2011
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Diefenbaker Lake Levels
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Diefenbaker Flows and Levels
1:10 year Peak Inflow
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U of S Review of 2010/11 Lake Diefenbaker Operations
• Reviewed flow and operational records, data records, interviewed staff and external experts
• Final report delivered February 2012• 8 major recommendations
• First identifies the need for a document clearly outlining the priorities and rules for operating the reservoir over the range of expected flow conditions
• Second identifies the need to clarify the operating objectives.• Remaining deal with data, modeling, and understanding of river
ice.
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2012 Stakeholder Engagement• WSA recognized need for stakeholder input in fall 2011 • Independent consultant retained to conduct an engagement
process starting in late May 2012. • Separate meetings for each sector (d/s municipal,
environment, First Nations, government, industry, u/s municipal, recreation, metis)
• Explored values and priorities• Report provided to WSA in December 2012.• Posted on website
https://www.wsask.ca/Lakes-and-Rivers/Dams-and-Reservoirs/Developing-and-Operating-Plan-for-Lake-Diefenbaker/
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ROM Template• Intended primarily for use by Forecasting & Operations• Provides clarity, consistency, defensibility, multiple forecasters• Intended to fit into OM&S manuals required by CDA guidelines• Applies to current realities• Seven sections plus Appendices
1. Introduction and background2. Objectives (purposes and priorities)3. Constraints (dam safety, physical, legal)4. Operating Zones and Rule Curves5. Operating Plans6. Protocol to determine operating recommendation7. Procedure to execute decision
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ROM Template
5. Operating Plans (flow conditions terminology from CDA)Routine
Below normal flow (not all users satisfied)Normal flow (all or most users satisfied)Moderate floods (not all users satisfied)
Unusual Large floods (multiple users not satisfied)
EmergencySituation in which the dam is potentially threatenedRefers to Emergency Response Plan if available
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ROM Template
6. Protocol to determine Operating Recommendation
• For use by Forecasters• What meteorologic stations, hydrometric stations• What hydrologic and routing models, where they are• May include flow charts and check lists• What documentation is required and where it is to be
filed• May refer to Products and Procedures Manual (under
development)
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ROM Template
7. Procedure to execute decision
• Procedure to move from recommendations to implementation…decision chain
• Communication of decision externally – Who, how and when notification of decision is provided to reservoir users and downstream stakeholders
• May include flow charts and check lists• What documentation is required and where it is to be
filed
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Process for Lake Diefenbaker ROM• Revise existing into new ROM format• Develop suite of alternative Operating Plans
• 2010/11 Review• Stakeholder Engagement report• Internal consultation and buy-in
• Develop reservoir performance measures• Assessment of alternative Operating Plans
• WRM modeling for water supply and seasonal and inter-annual variability
• Flood routing assessment, reservoir peak levels and duration, downstream flows and levels
• Simple economic assessment
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Process for Lake Diefenbaker ROM• Selection of preferred alternative
• Compile assessment results• Internal review and selection• Finalize documentation of assessments and process
• Preferred draft ROM and supporting documentation available for government approval
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Questions?