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Presenter #1 Presenter #2

Bay Delta Science Conference 2014

Jai Singh, BS Chris Bowles, PhD, P.E. Chris Campbell, MS

Yolo Bypass Widening into the Elkhorn Basin: A Multi-Benefit Opportunity for Flood Control, Floodplain Habitat and Fish Passage

Acknowledgements

• DWR

• USBR

• SAFCA

• Yolo County

• Knaggs Ranch

• CalTrout

• HDR

• MBK Engineers

• American Rivers

• Douglas Environmental

• AECOM

• ICF International

• Sacramento County

• Mick Klasson

• 2014 BiOp Hydrodynamic Modeling

• 2014 SAFCA Hydrodynamic Modeling

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Elkhorn Basin Site Location

Elkhorn Basin and Yolo Bypass Topography

Elevation (ft, NAVD88)

LJ S.019

c::::J s.02 - 10

0 10.01-1 2

LJ 12.01-14

- 14.01 - 16

- 16.01- 18

- 18.01 - 20

- 20.01 - 22

- 22.01-24

- 24.01- 26

- 26.01 -28

- 28.01-30

- 30.01 - 32

- 32.01 -34

- 34.01 - 36

LJ36.01 - 38

LJ 38.01 - 40

Elevation (ft, NAVD88)

D 8_019

D 8_02-10

D 10_01 - 12

D 12_0 1 - 14

- 14.0 1 - 16

- 16 .0 1 - 18

- 18.01 -20

26.01 -28

- 28.0 1 - 30

- 30.0 1 - 32

- 32.01 - 34

D 34 .01 - 36

D 36.0 1 - 38

D 38.0 1 - 40

Elkhorn Basin Historical Habitat SFEI Historical

Ecology

fluvial open water

tidal freshwater emergent wetland

non-tidal freshwater emergent wetland

wet meadow/seasonal wetland

vernal pool complex

Site Overview

Site Overview

View South from Fremont Landing

Orchards on Eastern Side of Northern Elkhorn Basin

Elkhorn Concept Development - April 2014 Photo by Mick Klasson

Mitigation Site

Elkhorn Basin and Yolo Bypass Land Ownership .. Land Ownership

c::::J Conoway Ranch Preservation Group, LLC

c::::J Heer Pistachio Farms Inc.

~ Knaggs Ranch LLC

c::::J Lang Fam Partnership

c::::J Riparian Ranch LLC

[ZZJ Sacramento River Ranch LLC

LJ Sacramento Valley Conservancy

LJ Siddiqui Family Partnership

D Stanley Trust

LJ Te Velde Trust

[;52.J Woodland Development Co. LLC

c::::J Yolo Land Trust

Benefits of Yolo Bypass Expansion into Elkhorn

• Flood relief

– Decreased peak flood stage at Verona and reduced backwater effects on Natomas Cross Canal tributaries

– Decreased peak flood stages along Sacramento River further downstream (Sacramento metro area)

• Floodplain habitat creation

– Increased acreage of juvenile salmonid rearing habitat

– Increased duration and improved timing of inundation

• Fish passage

– Improved upstream passage for sturgeon and salmonids

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Elkhorn Basin Site Constraints

• Existing land use

– Agriculture

• Orchards

• Annual crops

• Agricultural structures

– Residences

– Mitigation banks

• Project compatibility with agriculture

• Existing levee under-seepage

• Discharges into Yolo Bypass

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Elkhorn Basin and Yolo Bypass Topography

Elevation (ft, NAVD88)

~8.019

0 8.02 - 10

~ 10.01 - 12

O 12.01 - 14

11111 14.01 - 16

- 16.01 - 18

11111 18.01 - 20

20.01 - 22

11111 22.01 - 24

- 24 .01 - 26

11111 26 .01 -28

- 28 .01 -30

11111 30.01 - 32

11111 32.01 - 34

0 34.01 - 36

0 36.01 -38

O 38.01 - 4o

Elkhorn Basin Site Constraints

• Existing land use

– Residences

– Agriculture

• Orchards

• Annual crops

• Agricultural structures

– Mitigation banks

• Project compatibility with agriculture

• Existing levee under-seepage

• Discharges into Yolo Bypass

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Elkhorn Concept Development

• Site visits

• Hydrologic and hydraulic analyses

• Concept-development charrette

• TAC meetings

• Meetings with landowners

• Hydrodynamic modeling

Initial Elkhorn Conceptual Design

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Elevation Ill, NAVD88) c:::J 8.01Q

c:::J s .02-10

0 10.01-12

0 12.01.14

- 14.01 - 18

- 18.01-18

- 18.01-20

. 20.01· 22

. 22.01-24

- 24.01-28

. 28.01·28

- 28.01·30

. 30.01· 32

- 32.01·34

. 34.01-Je

LJ3e.ol·38

c:::J 38.01· 40

5,000 7,500 10,000

Model Animations

• Animations for WY 2005 (wet conditions) and WY 2007 (dry conditions)

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Wetted Acres Comparison – 2005 (Wet Conditions)

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

7,000 6,000

.--. 5,000 tf) 4-u

4,000 .__,

:? 0 3,000

LL 2,000 1,000

35,000

30,000

25,000

Q)

b 20,000 ro ro ~ 15,000 <(

10,000

5,000

Oct 2004

t-

t-

t-

t-

t-

-- GATE ELKHORN FLOW

Dec Jan Feb Mar

- WETIED AREA ELKHORN2 AREA

_j t- t-

+ t-

+ t-

- WETIED AREA EXG AREA

Jun 2005

Wetted Acres Comparison – 2007 (Dry Conditions)

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

6,000

5,000 ~

(f) 4,000 ,._ u -$ 0

3,000 LL 2,000

1,000

0

14,000

12,000

10,000

~

Q)

8,000 ,_ u (I) -(I) Q) 6,000 ,_ <(

4,000

2,000

0

-

--

-

-

-

-

-

-

-

-

-

--

Oct

2006

I

- GATE ELKHORN FLOW

Nov

)\ I\

I

~ J~ r{ --- I

- -

I Dec I Jan I

- WETTED AREA ELKHORN2 AREA

-\}\ A

>-- +

-

I ...

... I

(\ v ~ I

Feb I Mar I Apr I May 2007

- WETTED AREA EXG AREA

Summary of Preliminary Results

• Floodplain habitat generation

– Elkhorn offers a highly connected floodplain area

– Site management can provide greater late season inundation

• Flood relief

– WS elevations at Verona reduced by more than 2 ft during the 1997 flood

– Greater reductions when coupled with other Bypass improvements

• Likelihood for phasing habitat improvements and flood relief improvements at Elkhorn

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Thank You

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

Questions? Jai Singh: [email protected] Chris Bowles: [email protected]

Impact of Different Post-Gate Closure Flow Rates

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

1,600

- 1,200 (J) ,._ (_) -s 0 U:

800

400

35,000

30,000

25,000

-b 20,000 (U

(U

~ 15,000 .:!:

10,000

5,000

22

May2005

- GATE ELKHORN FLOW

---+

29

- WETIED AREA ELKHORN2 1 OOOCFS AREA

~

... ~

.. ...

...

5 12 19 Jun2005

- GATE ELKHORN 1 OOOCFS FLOW - W ETIED AREA ELKHORN2 AREA

- WETIED AREA EXG AREA

Wetted Acres Comparison – 1997 (Wet Conditions)

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

7,000

6,000

~ 5,000 ~ 4,000 ;$: 0 3,000 u:::

2,000

1,000

0

50 ,000

40,000

Q) u 30,000 ~ ('\)

~

<{ 20,000

10,000

Oct 1996

..

...

...

- GATE ELKHORN FLOW

Nov

"" ~ -~

I -

.. -

~ A-~ ...

J

Dec Jan Feb Mar Apr May

1997

- W ETTED AREA ELKHORN2 AREA - WETTED AREA EXG AREA

Wetted Acres Comparison – 2004 (Moderate)

Yolo Bypass Widening into the Elkhorn Basin – BDSC 2014

7,000

6,000

c.n 5,000 ~ 4,000 s 0 3,000 u:::

2,000

1,000 0

50,000

40,000

Q)

b 30,000 ~ l.U Q)

~ 20,000

10,000

Oct

2003

...

..

..

-- GATE ELKHORN FLOW

... ...

.. ..

..

+

Nov Mar Apr May

2004

- WETIED AREA ELKHORN2 AREA - WETIED AREA EXG AREA

Floodplain Habitat Extents and Duration Inundation Mapping for EFM Analysis of Modeled Stage 2 of 3 Years from 12/1 to 5/15

Cont inuous Inundat ion Exceedance Every 2 of 3 Years from 12/1 to 5/15

Inundation Duration .. 4Weeks

.. 3 Weeks

- 2 Weeks

D 1 Week

Integrating Elkhorn Expansion with Other Bypass Improvements

• DWR/Bureau improvements for YB BiOp

• Yolo Bypass east levee setbacks further south

• Enhanced Tule Corridor

Yolo Bypass Widening into the Elkhorn Basin – FMA 2014