ecological importance of fall and summer flows in the yolo...
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Ecological Importance ofFall and Summer Flows in the
Yolo Bypass
Jared Frantzich, Ted Sommer, and Brian SchreierDepartment of Water Resources
Division of Environmental Services
WinterSpring
Summer Fall
Typical Net Flow
Known Region with Enriched Plankton
Willow Slough Bypass
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
.
Toe Drain +Floodplain
Toe Drain
Fall 2012 Unprecedented Delta Phytoplankton Bloom
No comparable Delta bloom for over 20 years!
Willow Slough Bypass
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
.
0
5
10
15
20
-200
0
200
400
600
800
1000
1-Jul 1-Aug 1-Sep 1-Oct 1-Nov
Chlorophyll (µg/L)
Net
Flo
w (c
fs)
Lisbon Flow (cfs)
Rio Vista SondeChlorophyll
10 µg/L
So what have we been up to since 2012?2013 – 2016 Summer/Fall Flow Special Studies
WQ MonitoringNutrients Phyto/ZoopWillow Slough Bypass
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
.
Key Findings from Fall Flow Special Studies
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
.
WWTP
DWTP
1.) Nutrient Transport
2.) Phytoplankton Transport
3.) Improved Zooplankton Abundance
Positive Downstream Food Web Benefits
Cladocerans Calanoid copepods
69% Diatoms 15% Greens
N + P
Willow Slough Bypass
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
.
Key Findings from Fall Flow Special Studies4.) Discharge Volume + Velocity both important for downstream response
0
200
400
600
800
0
5,000
10,000
15,000
20,000
25,000
30,000
2011 2012 2013 2014 2016
cfs
ac-ft
Total Discharge Volume (ac-ft)Max Daily Ave. Net Flow
Toe Drain @ Lisbon Weir
2016 Summer Managed Flow Pulse
Hungry Smelt
Yolo Bypass
Knights Landing Ridge Cut
Reoperation of KLOG
Wallace Weir Coordination
Knaggs Ranch
Increased Keswick Flows
Delivery of Sac River Flow
Additional Pumping
Additional Pumping
2016 Evidence of Downstream Response
-10
0
10
20
30
40
50
60
-200
-100
0
100
200
300
400
500
600
7/1 7/11 7/21 7/31 8/10 8/20 8/30
Chlorophyll (μg/L)Fl
ow (c
fs)
Lisbon FlowRio Vista - Chl Sonde Data
Aulacoseira sp.
0
2000
4000
6000
8000
10000
12000
Diatom - Cymatopleura sp.Diatom - Cyclotella sp.Diatom - Aulacoseira sp.Other GreensOther DiatomsFlagellatesCyanosCryptophytes
During After BloomBefore
Aulacoseira sp. Cyclotella sp.
Summer Flows Transport PhytoplanktonBi
ovol
ume
(µm
³/mL) 44% of BV 20% of BV
Toe
Drai
n
Pros
pect
Low
er C
ache
Rio
Vist
a
Toe
Drai
n
Pros
pect
Low
er C
ache
Rio
Vist
a
Toe
Drai
n
Pros
pect
Low
er C
ache
Rio
Vist
a
Rio
Vist
a
Early July Late July Mid Aug Aug. 22
During – Late July After – Early SeptZooplankton Community Shift to Calanoids
Calanoid copepodids
Bosmina
Cyclopoid copepodids
P. Forbesi adults
4 Most Dominant Zoop Taxa
Summer and Fall Flow Dynamics*DWR DSM2 Flow Model Support
% o
f Par
ticles
(-) Negative % = Landward Flux(+) Positive % = Downstream Flux
Cache Slough Complex
Rio Vista
Summer and Fall Flow Dynamics*DWR DSM2 Flow Model Support
Cache Slough Complex
Rio Vista
% o
f Par
ticles
(-) Negative % = Landward Flux
(+) Positive % = Downstream Flux
Year Lisbon Max Daily Ave Net Flow (cfs)
Lisbon Total Average Net Volume
(ac-ft)2011 412 22,3562012 723 27,2242013 283 11,4372014 239 2,5032015 383 17,9092016 546 12,752
Willow Slough Bypass
Putah Creek
Sacramento
Rio Vista
50 15105Kilometers
Hwy I-80
Bypass
Feather R
. Flow Discharge Volume + Velocity both important for downstream response
*Summer Flow Pulse
Summer and Fall Flow Dynamics
Summer and Fall Flow Dynamics
2012 Fall Particle Release Fate
PTM Study Area Colored by Regions
Wee
k
8/31 9/7 9/14 9/21
*CBEC MIKE21 Historical Flow Modeling
Upper Cache Slough
Cache Slough
Sac River
Little Holland
Toe Drain &Prospect Sl.
LindseySlough
LibertyIsland
Whipple et al. 2012Rio Vista
Yolo Bypass & Cache Slough Complex
Sac River
Flow Pathways Are Important Too
Historical Delta
Future Plans
Increased Project Funds for FY 2017 and 2018
Planning Efforts for 2017 Summer/Fall Flow Pulse
• SFSU Kimmerer Lab: Zooplankton Growth and Reproduction
• SFSU Dugdale/Wilkerson Lab: Measure Primary Productivity and Nutrient Uptake Rates
• Biological Modeling and Contaminants Analysis - USGS
AcknowledgementsKris Tjernell, Project Coordinator
Carl Wilcox & Yolo Wildlife Area Staff
Cindy Messer, Ted Sommer, James Newcomb, & Manny Bahia
Division of Flood Management, Division of Environmental ServicesStaff, & North Central Region Staff
John Brennan, Mike Hall, Darren Cordova, Mike Lear, GlenColusa District Staff, & Reclamation District 108
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