January 29, 2013 Lake Diefenbaker Reservoir Operation Proposed Operating Manual Development
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
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.
Lake Diefenbaker Specifications Reservoir Design Full Supply Level (FSL) Effective drainage area 556. 87 metres Maximum depth 58 metres at FSL Length 225 km at FSL Area 43, 000 hectares at FSL Storage at FSL 9, 400, 000 dam 3 (total) 4, 300, 000 dam 3 (live) 126, 000 km 2
Operation Targets for Lake Diefenbaker
Recorded Lower Quartile Median p Au g Se 1, 1, 11 20 1 01 , 2 11 20 1 01 11 20 , 2 1, l 1 Ju n M ay Ju 1, 1, 0 0 01 , 2 r 1 Ap ar M b Fe Ja n c 1 De 01 , 2 v 1 No 10 20 , 2 1, t 1 Oc p Se Elevation - m Diefenbaker Lake Levels 557 556 555 554 553 552 551 550 549 Upper Quartile
3500 Discharge - m 3/s 3000 2500 1: 10 year Peak Inflow 2000 1500 1000 500 0 Inflow Apr 1, 2011 May 1, 2011 Outflow Elevation FSL Jun 1, 2011 Jul 1, 2011 Aug 1, 2011 558 557 556 555 554 553 552 551 550 549 548 547 546 545 544 Elevation - m Diefenbaker Flows and Levels
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.
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-Planfor-Lake-Diefenbaker/
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 background 2. Objectives (purposes and priorities) 3. Constraints (dam safety, physical, legal) 4. Operating Zones and Rule Curves 5. Operating Plans 6. Protocol to determine operating recommendation 7. Procedure to execute decision
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) Emergency Situation in which the dam is potentially threatened Refers to Emergency Response Plan if available
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)
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
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 interannual variability • Flood routing assessment, reservoir peak levels and duration, downstream flows and levels • Simple economic assessment
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
Questions?
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