Dudley Reiser, Eric Jeanes, Stuart Beck, Catherine Morello R2 … · 2018. 6. 26. · Dudley...
Transcript of Dudley Reiser, Eric Jeanes, Stuart Beck, Catherine Morello R2 … · 2018. 6. 26. · Dudley...
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Dudley Reiser, Eric Jeanes, Stuart Beck,Catherine MorelloR2 Resource Consultants
and Dwayne Paige and Heidy BarnettSeattle Public Utilities
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Chester Morse Lake –major water supply for City of Seattle – also some limited hydropower generation
Major tributaries –Cedar and Rex rivers
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Rex River
Cedar River
Chester Morse Lake
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Cedar watershed supports Adfluvial populations of bull trout (“threatened” under ESA)
Estimated population
of bull trout: 3100 adults
Pygmy whitefish (native) and rainbow trout (introduced) also present
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Reservoir levels fluctuate seasonally
Low levels create riverine habitats in lower reaches of rivers –conducive for spawning
Higher levels –progressive upstream shift from riverine to lacustrine habitats –potential reddinundation
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Redd inundation
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1/1 4/1 7/1 10/1 1/1
Flo
w (
cfs)
0
1000
2000
3000
4000
5000
6000
7000
Maximum
Median
Minimum
Cedar River Upstream
from Chester Morse Lake
1946 to 2006
Spawning
Incubation
Incubation
Bull trout spawning on rising limb of hydrograph
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1/1 4/1 7/1 10/1 1/1
Wate
r S
urf
ace
Ele
vati
on
(fe
et)
1520
1530
1540
1550
1560
1570
1580
Maximum
Median
Minimum
Chester Morse Lake
1979 to 2006
Spawning
Incubation
Incubation
Bull trout spawning when reservoir levels low
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Suitable depths and velocities
Intragravel velocities &
downwelling
Clean gravels = low fine
sediments (
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Lower redds 10-15 ft deep
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Assessment of potential bull trout “take” required in HCP
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ENDANGERED SPECIES ACT
- SECTION 7
BIOLOGICAL OPINION
UNLISTED SPECIES
ANALYSIS, AND SECTION 10
FINDINGS
for proposed issuance of a
Section 10 Incidental Take
Permit to the City of Seattle,
Seattle Public Utility, for the
Cedar River Watershed
Habitat Conservation Plan
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Effects of reservoir fluctuations on bull trout spawning and egg survival: SPECIFICALLY – effects of redd inundation Ho – Higher egg mortality related to longer periods of
redd inundation
Estimate potential “take” (if possible)
Define causal mechanisms of take
Integrate results into “risk-averse” operational plan
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Remote spawning of bull trout Artificial redds constructed within zone of reservoir
influence Monitor redds and “controls” for survival and
emergence Collect ancillary data Sediment Water temperature DO
Comparisons of Survival to emergence (STE) vs Days of inundation
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Capture
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Spawn – Fertilize – Water Harden
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Cedar River
5 females spawned (400-528 mm FL)
2 males (460-520 mm FL)
Rex River
5 females spawned (453-563 mm FL)
1 male (546mm FL)
Weights – range 650 – 1500 gm
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Egg Planting
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• Filled with clean gravel
•Duct tape on bottom
•50 embryos per box
•4 boxes per redd
•Colored string attached
for relocation
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N=23
Approximate upper
extent of inundation
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Approximate upper
extent of inundation
N=17
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CONTROLS
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9/1/06 10/1/06 11/1/06 12/1/06 1/1/07
Ch
este
r M
ors
e L
ak
e
Wate
r S
urf
ace
Ele
vati
on
(fe
et, N
GV
D29
)
1520
1530
1540
1550
1560
1570
1580
Ced
ar
Riv
er
Dail
y-A
ver
ag
ed F
low
(cfs
)
0
1000
2000
3000
4000
5000
6000
7000
Water surface elevation (reported at 8:00 AM)
Flow at USGS Gage 12115000
100 YEAR
FLOOD
Eggs
planted
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Scour and dislodgement
Deposition and covering
Channel re-alignment
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TESTS COMPROMISED
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N=23
Approximate upper
extent of inundation
76% survival
Not Found/Recovered
4% survival
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Approximate upper
extent of inundation
N=17
Not Found/Recovered
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PRELIMINARY POSTULATES:
•Observations
•Some physical data
•Some biological data
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OBSERVATIONS
Surficial sediment
deposition noticeable
at reservoir – river interface
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Site
1 2 3 4 5 6 7 8 9
Per
cen
t F
ines
les
s th
an
0.8
4 m
m
0
10
20
30
40
UPSTREAM
Patterns of Sediment Deposition
PHYSICAL DATA ?
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Riverine - Low sediment levels = high egg
survival
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Lacustrine - High sediment levels = low egg survival
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Operations - Static
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Operations - Dynamic
RISK
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Risk of DEPOSITION
& ENTOMBMENT
Risk of low DO
& App Vel
Combinations of River Flow and
Reservoir Levels are complicated
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9/1/06 10/1/06 11/1/06 12/1/06 1/1/07
Ch
este
r M
ors
e L
ak
e
Wate
r S
urf
ace
Ele
vati
on
(fe
et, N
GV
D29
)
1520
1530
1540
1550
1560
1570
1580
Ced
ar
Riv
er
Da
ily
-Av
era
ged
Flo
w (
cfs
)
0
1000
2000
3000
4000
5000
6000
7000
Water surface elevation (reported at 8:00 AM)
Flow at USGS Gage 12115000
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QUESTIONS