jim brown, wdfw kahler’s (douglas pud) presentation to the ......okanagan river at oliver -...

2019

Jim Brown, WDFWPresentation Adapted from Tom Kahler’s (Douglas PUD) Presentation to the

Icicle Steering Committee on April 11, 2019

Challenge 1:Large Variation in Annual Inflow

Challenge 2:

Water managers required to balance multiple competing objectives & trade-offs

Over space and time

Across multiple entities

Using incomplete or uncertain information

Okanagan Lake

Okanagan River at Penticton

Okanagan River at OK Falls

Okanagan River at Oliver

Osoyoos Lake

Okanagan Lake

Skaha Lake

Vaseaux Lake

Osoyoos Lake

· Flood control (< 342.75m)

· Shore spawning kokanee incubation

(lake draw-down from Oct-15 to Apr

less than 0.2 m)

· Domestic & agricultural water intakes

· Recreational navigation

· Flood control (< 60 m3.sec

-1)

· River recreation (> 10 m3.sec

-1,

Jul-Aug)


-1)


-1)

· Sockeye incubation (flows less than

30 m3.sec

-1 Nov - Apr/May)

· Domestic & agricultural water

intakes (> 6 m3.sec

-1)

· Recreational navigation

· Sockeye juveniles, temperature-

oxygen squeeze mitigation

(cumulative Jul 1 - Sep 30 inflows

~ 145 to 167 million m3+)

Okanagan Lake

Dam

Challenge 3:Low Level of Trust Between PartiesLimited 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.R

IVER

FLO

W (

CM

S)

PREFERRED RANGE

From 1982-1997 river discharge exceeded OBIA fishery flows in:

(a) 13 of 16 yrs for adult migration

(b) 9 of 16 yrs for spawning and

(c) 7 of 16 yrs for egg incubation & fry migration

RIV

ER F

LOW

(C

MS)

RIV

ER F

LOW

(C

MS)

OBA preferred flow range

Observed flow range

(a) migration (b) spawning

(c) incubation

Figure by ESSA Technologies Ltd., 2014

Fish-Water

Management Tool

Decision Makers (Multidisciplinary Team)

Satellite

Snow Pack

Okanagan Lake

Okanagan River

Osoyoos Lake

Dam

OKANAGAN FISH & WATER MANAGEMENT TOOL

Adapted from presentation by Brian Symonds, Adaptive Management for Large-scale Water Infrastructure, New Orleans, LA, 26 July 2018

Flood risk

Resident fish

Recreation

Anadromous salmon

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…

Optimal Policy

(decision point)

Multiple Objectives

Scientific

Uncertainty

Value Differences

Base-case

Assumptions

Performance Measures

& Hazard ThresholdsAgree on…Inflow

Estimates

Individual analysis…

Group analysis…

Best Dam-release Policy: Point-of-view “X”

Adapted from presentation by Brian Symonds, Adaptive Management for Large-scale Water Infrastructure, New Orleans, LA, 26 July 2018

0

10

20

30

40

50

60

70

80O

ct-

01

Oct-

15

Oct-

29

Nov-1

2

Nov-2

6

Dec-1

0

Dec-2

4

Jan-0

7

Jan-2

1

Feb-0

4

Feb-1

8

Mar-

04

Mar-

18

Apr-

01

Apr-

15

Apr-

29

May-1

3

May-2

7

Jun-1

0

Jun-2

4

Jul-08

Jul-22

Aug-0

5

Aug-1

9

Sep-0

2

Sep-1

6

Sep-3

0

Oliv

er

dis

charg

e (

m3.s

-1)

AVG

HIGH

LOWSockeyeSpawning

Incubation

Emergence

Manage flood risk

scour threshold

desiccation threshold

Manage drought risk

Event timing & natural variations determine whether fish and water managers satisfy OBA rules & competing objectives

Hyatt et al. 2011

Okanagan River at Oliver - Average

Flood control

Domestic intakes

Ag. intakes

Sockeye Eggs

Sockeye Alevins

-5.0

5.0

15.0

25.0

35.0

45.0

55.0

65.0

75.0

85.0

95.0

105.0

115.0

125.0

135.0

145.0

155.0O

ct-

07

Oct-

21

Nov-0

4

Nov-1

8

Dec-0

2

Dec-1

6

Dec-3

0

Jan-1

3

Jan-2

7

Feb-1

0

Feb-2

4

Mar-

09

Mar-

23

Apr-

06

Apr-

20

May-0

4

May-1

8

Jun-0

1

Jun-1

5

Jun-2

9

Jul-13

Jul-27

Aug-1

0

Aug-2

4

Sep-0

7

Sep-2

1

OK

Riv

er (

m3.s

ec

-1)

Okanagan Basin Agreement target to minimize redd scour

BC-Washington Co-Operative Plan minimum flow targets

Sockeye biologist’s rule of thumb to avoid de-watering

Multi-objective indicators from screen-capture in FWMT software


Flood control

Domestic intakes

Ag. intakes

Sockeye Eggs

Sockeye Alevins

-5.0

5.0

15.0

25.0

35.0

45.0

55.0

65.0

75.0

85.0

95.0

105.0

115.0

125.0

135.0

145.0

155.0

Oct

-07

Oct

-21

Nov-0

4

Nov-1

8

Dec-

02

Dec-

16

Dec-

30

Jan-1

3

Jan-2

7

Feb-1

0

Feb-2

4

Mar-

10

Mar-

24

Apr-

07

Apr-

21

May-0

5

May-1

9

Jun-0

2

Jun-1

6

Jun-3

0

Jul-

14

Jul-

28

Aug-1

1

Aug-2

5

Sep-0

8

Sep-2

2

OK

Riv

er

(m3.s

ec

-1)


Flood control

Domestic intakes

Ag. intakes

Sockeye Eggs

Sockeye Alevins

-5.0

5.0

15.0

25.0

35.0

45.0

55.0

65.0

75.0

85.0

95.0

105.0

115.0

125.0

135.0

145.0

155.0

Oct

-07

Oct

-21

Nov-0

4

Nov-1

8

Dec-

02

Dec-

16

Dec-

30

Jan-1

3

Jan-2

7

Feb-1

0

Feb-2

4

Mar-

10

Mar-

24

Apr-

07

Apr-

21

May-0

5

May-1

9

Jun-0

2

Jun-1

6

Jun-3

0

Jul-

14

Jul-

28

Aug-1

1

Aug-2

5

Sep-0

8

Sep-2

2

OK

Riv

er

(m3.s

ec

-1)

(A) Actual and predicted flows at Oliver (sockeye spawning grounds) 9-Feb-06

(B) Final outcome at Oliver (sockeye spawning grounds) 30-Sep-06

OKANAGAN FWMT 2005-2006 WATER

MANAGEMENT YEAR

Decision Point – Hydrograph Trending Toward Exceedance of Rules #8 & #9

Model Accurately Predicts Event

Okanagan Lake Kokanee Emergence Timing

Annual Sockeye Passage at Wells Dam, 1977 - 2018

Annual Sockeye Counts at Tumwater and Wells Dams 1977 - 2018

Questions?

jim brown, wdfw kahler’s (douglas pud) presentation to the ......okanagan river at oliver -...

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