2019 Jim Brown, WDFW Presentation Adapted from Tom Kahler’s (Douglas PUD) Presentation to the Icicle Steering Committee on April 11, 2019
Challenge 1: Large Variation in Annual Inflow
Okanagan Lake Okanagan Lake · Flood control (< 342.75m) · Shore spawning kokanee incubation Challenge 2: (lake draw-down from Oct-15 to Apr less than 0.2 m) Okanagan Lake · Domestic & agricultural water intakes Dam · Recreational navigation Okanagan River at Penticton · 3 .sec -1 ) Flood control (< 60 m Water managers · 3 .sec -1 , River recreation (> 10 m Jul-Aug) required to balance Skaha Lake multiple competing objectives & trade-offs Okanagan River at OK Falls · 3 .sec -1 ) Flood control (< 78 m Vaseaux Lake Over space and time Okanagan River at Oliver · 3 .sec -1 ) Flood control (< 96 m · Sockeye incubation (flows less than 3 .sec -1 Nov - Apr/May) 30 m Across multiple entities · Domestic & agricultural water 3 .sec -1 ) intakes (> 6 m · Recreational navigation Using incomplete or uncertain information Osoyoos Lake Osoyoos Lake · Sockeye juveniles, temperature- oxygen squeeze mitigation (cumulative Jul 1 - Sep 30 inflows 3 +) ~ 145 to 167 million m
Challenge 3: Low Level of Trust Between Parties Limited engagement between water managers, fisheries agencies, and First Nations on operational decisions Perceptions by fisheries agencies and First Nations: • Lack of transparency and inclusion • Water managers giving greater weight to human- system concerns at the expense of ecosystem concerns
Compliance with OBIA Fishery Flows was low prior to 1998. (b) spawning (a) migration RIVER FLOW (CMS) RIVER FLOW (CMS) OBA preferred flow range (c) incubation Observed flow range From 1982-1997 river discharge RIVER FLOW (CMS) exceeded OBIA fishery flows in: (a) 13 of 16 yrs for adult migration (b) 9 of 16 yrs for spawning and PREFERRED RANGE (c) 7 of 16 yrs for egg incubation & fry migration
Figure by ESSA Technologies Ltd., 2014
OKANAGAN FISH & WATER MANAGEMENT TOOL Snow Pack Satellite Dam Okanagan Lake Okanagan River Fish-Water Management Tool Osoyoos Lake Decision Makers (Multidisciplinary Team) Adapted from presentation by Brian Symonds, Adaptive Management for Large-scale Water Infrastructure, New Orleans, LA, 26 July 2018
Resident fish Anadromous salmon Recreation Flood risk Rule 1 : Don’t fill Okanagan Lake above 342.56 meters (i.e. 10 cm rise above 342.56 incurs $5- $10 million in “property” losses!) Rule 2: Try to avoid drafting to lake levels below 341.50 meters. (i.e. problems with docks, water intakes, & vessel navigation become severe). Rule 3: Minimize draw-down of Okanagan L. between the time of kokanee spawning and 100% fry emergence (i.e. minimize dewatering kokanee eggs & fry, but don’t risk violation of “rules” 1, 6, 7, 8, & 9) Rule 4: Minimize the number of buildings flooded at Penticton Rule 5: Provide summer flows for recreation if possible Rule 6: Sockeye Migration – maintain flows (@ Oliver) between 8.5 & 12.7 cms during Aug 1 to Sept 15 to allow “easy” passage of VDS. Rule 7: Sockeye Spawning – maintain flows between 9.9-15.6 cms during Sept 16-Oct 31 to maximize “good” spawning habitat. Rule 8: Sockeye Incubation- flows at 5.0- 28.3 cms during Nov 1-Feb 15, i.e. egg incubation flows greater than or equal to 50 % of spawning flows & must not exceed 28.3 cms to avoid redd desiccation & scouring. Rule 9: Sockeye Fry emergence-migration flows during Feb 16-Apr 30 at 5.0-28.3 cms.
Procedure for In- season Use… Base-case Performance Measures Inflow Agree on… Assumptions & Hazard Thresholds Estimates Individual analysis… Best Dam-release Policy: Point-of- view “X” Group analysis… Multiple Objectives Scientific Optimal Policy Uncertainty (decision point) Value Differences Adapted from presentation by Brian Symonds, Adaptive Management for Large-scale Water Infrastructure, New Orleans, LA, 26 July 2018
Event timing & natural variations determine whether fish and water managers satisfy OBA rules & competing objectives AVG 80 Manage drought risk Manage flood risk HIGH Sockeye 70 LOW Spawning -1 ) Incubation 60 3 .s Emergence Oliver discharge (m 50 40 scour threshold 30 20 desiccation threshold 10 0 May-13 May-27 Nov-12 Nov-26 Jan-07 Jan-21 Mar-04 Mar-18 Apr-01 Apr-15 Apr-29 Jun-10 Jun-24 Jul-08 Jul-22 Aug-05 Aug-19 Oct-01 Oct-15 Oct-29 Dec-10 Dec-24 Feb-04 Feb-18 Sep-02 Sep-16 Sep-30 Hyatt et al. 2011
Okanagan River at Oliver - Average Multi-objective indicators from screen-capture in FWMT software 155.0 145.0 Flood control 135.0 Domestic intakes 125.0 Ag. intakes -1 ) 115.0 Sockeye Eggs 3 .sec 105.0 Sockeye Alevins OK River (m 95.0 85.0 75.0 65.0 55.0 45.0 35.0 25.0 15.0 5.0 -5.0 Nov-04 Nov-18 Mar-09 Mar-23 Apr-06 Apr-20 May-04 May-18 Sep-07 Sep-21 Oct-07 Oct-21 Dec-02 Dec-16 Dec-30 Jan-13 Jan-27 Feb-10 Feb-24 Jun-01 Jun-15 Jun-29 Jul-13 Jul-27 Aug-10 Aug-24 Sockeye biologist’s Okanagan Basin BC-Washington Co- rule of thumb to avoid Agreement target to Operative Plan de-watering minimize redd scour minimum flow targets
OKANAGAN FWMT Okanagan River at Oliver - Average 2005-2006 WATER 155.0 145.0 Flood control MANAGEMENT YEAR 135.0 Domestic intakes 125.0 Ag. intakes -1 ) 115.0 Sockeye Eggs 3 .sec 105.0 Sockeye Alevins 95.0 (A) Actual and OK River (m 85.0 Decision Point – Hydrograph Trending predicted flows at 75.0 Toward Exceedance of Rules #8 & #9 65.0 Oliver (sockeye 55.0 spawning grounds) 45.0 35.0 9-Feb-06 25.0 15.0 5.0 -5.0 Oct-07 Oct-21 Nov-04 Nov-18 Dec-02 Dec-16 Dec-30 Jan-13 Jan-27 Feb-10 Feb-24 Mar-10 Mar-24 Apr-07 Apr-21 May-05 May-19 Jun-02 Jun-16 Jun-30 Jul-14 Jul-28 Aug-11 Aug-25 Sep-08 Sep-22 Okanagan River at Oliver - Average 155.0 145.0 Flood control 135.0 Domestic intakes 125.0 Ag. intakes -1 ) 115.0 Sockeye Eggs 3 .sec 105.0 Sockeye Alevins (B) Final outcome 95.0 OK River (m 85.0 at Oliver (sockeye Model Accurately 75.0 spawning grounds) 65.0 Predicts Event 55.0 30-Sep-06 45.0 35.0 25.0 15.0 5.0 -5.0 Oct-07 Oct-21 Nov-04 Nov-18 Dec-02 Dec-16 Dec-30 Jan-13 Jan-27 Feb-10 Feb-24 Mar-10 Mar-24 Apr-07 Apr-21 May-05 May-19 Jun-02 Jun-16 Jun-30 Jul-14 Jul-28 Aug-11 Aug-25 Sep-08 Sep-22
Okanagan Lake Kokanee Emergence Timing
Annual Sockeye Passage at Wells Dam, 1977 - 2018
Annual Sockeye Counts at Tumwater and Wells Dams 1977 - 2018
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