Ponds 6, 7 & 8 Design UpdatePonds 6, 7 & 8 Design UpdateNapa Sonoma Marsh Napa Sonoma Marsh

Restoration Group MeetingRestoration Group Meeting

USGS San Pablo Field Station Office, Building 505, Mare IslandUSGS San Pablo Field Station Office, Building 505, Mare Island

April 17, 2008April 17, 2008

Presentation Presentation• Schedule• Project Design Overview• Mixing Chamber Design• Water Quality Sampling

• 50% Design Submitted April 2007• 90% Design Submitted February 2008• Waiting on USACE Input for Design• Permitting Ongoing

ScheduleSchedule

Location MapLocation Map

Ponds 6/6A Project ObjectivesPonds 6/6A

Project Objectives

• Maximize Habitat for Shorebirds and Waterfowl

• Improve Management Flexibility

• Improve Levees

6A Donut

6 Donut

POND 6A

POND 6

CANAL

NAPA SLOUGH

CHINA SLOUGH

DE

VIL

’S S

LO

UG

H

NAPA SLOUGH

Abandon Siphon

48”Inlet/Outletwith

Gate

2-36” Inlet/Outlet with Gates

4-36” Outfalls with Gates

LITTLE ISLAND FARM

4 - 36” Inlet/Outlet with Gates

48” Siphon

4 - 36” Culverts with Gates

2 - 36” Inlet/Outlet with Gates

48” Siphon

Upper Ponds Project ObjectivesUpper Ponds

Project Objectives• Pond 7 Bittern Reduction in 8 years• New Outfall to Napa Slough• Demolish Siphon to Ponds 6/6A• Improved Pond Management Flexibility

POND 7A

POND 7

POND 8

NA

PA

RIV

ER

MU

D SLO

UG

H

NAPA SLOUGH

HU

DE

MA

N

SL

OU

GH

CANAL

CANAL

2-30” Culverts

3-36” Culverts

36” Siphon

36” Siphon

Donut

Mixing Chamber - General Setting

Mixing Chamber - General Setting

Design Criteria for the Mixing Chamber are:

• Mixing chamber inflow of ambient ~ 14,000 afy

• Initial bittern release = 1% of Mixing chamber inflow = 140 afy

• Design to provide flexibility for future increase in bittern release

• Provide complete mixing

General SettingGeneral Setting

Pond 7APond 8

Pond 7 (Bittern)

Mixing Chamber

CANAL FROM POND 8

INTERNAL LEVEE

POND 7

POND 7A

36” WIDE SLUICE GATE

POND 7/7A DONUT (MIXING CHAMBER)

NEW CONTROL STRUCTUREINVERT AT 2.5 FT

NEW 36” INLET WITH GATEINVERT AT 2.5 FT

2 NEW 36” CULVERTS WITH GATES

INVERT AT 2.5 FT

2 NEW 48” OUTFALL WITH GATEINVERT AT 0 FT

Design SchematicDesign Schematic

DREDGE CANAL TO EL. 0 FT

2 NEW 48” OUTFALL WITH GATES

INVERT AT 0 FT

DREDGE MIXING CHAMBERTO EL. 0 FT

Automated SystemAutomated SystemAutomated System was Selected:

• Highest Flexibility – given design uncertainties, provides flexibility for post-construction calibration and adjustments to meet field conditions

• Data collection & reporting capabilities

• Emergency notifications

• Standard gates available for future habitat pond management

• Less long-term infrastructure to demo

Level Sensor

Flow Sensor

Gate Actuator

Water Quality

DB Cables

Control System ConceptControl System Concept

Mixing Chamber

TerminalBuilding

PowerCommunications

Pond 7

Pond 7 Channel

Pond 8 ChannelPond 7A

Mixing Power RequirementMixing Power Requirement

Elevation, z [m]

Density, [kg/m3]

zm

z0

zb

ambient

1,010.6

fully-mixed

1,023.6

bittern

1,256.9

Fully-mixed density profile

Stratified density profile Mixing chamber

bathymetry

Thickness of bittern layer

The energy required to mix the water column completely depends on:

• Bittern and ambient water density difference • Water depth in the Mixing Chamber

Mixing Power AvailableMixing Power AvailableMixing Power Required and Available Power as a Function of

Mixing Chamber WSEL During Tide Cycle

0

1

2

3

4

5

6

0.000 0.002 0.004 0.006 0.008 0.010 0.012

Mixing Power (Watts/m2)

WS

EL

(m

NA

VD

88)

Available Power

Power Required

Ponds 7, 7A, and 8: Water Quality Sampling

Ponds 7, 7A, and 8: Water Quality Sampling

4 Monitoring Locations Pollutants/Parameters

Pesticides/PCBs, volatile organics, semi-volatile organics, metals, mercury, chromium VI, hardness, turbidity

Field Measurements Dissolved oxygen, pH, salinity, water temperature, tidal

stage, weather

Sampling Schedule Two sampling events: Spring and Fall 2008

Ponds 7, 7A, and 8: Monitoring Locations

Ponds 7, 7A, and 8: Monitoring Locations

Questions?Questions?

Terminal BuildingTerminal Building

System Components in the Terminal Building • Controller (PLC) – Gate control• Remote Terminal Unit (RTU) – Data collection• Batteries/Charger – Provides Power• Radio/ Antenna – Offsite Data Communications• Gate Control Master Panel – Local manual gate control• Intrusion Sensors (Door Switch/Motion Sensors)

The hydraulic problem is… The hydraulic problem is…

-2.00

-1.00

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

4/3/01

4/17/01

5/1/01

5/15/01

5/29/01

6/12/01

6/26/01

7/10/01

7/24/01

8/7/01

8/21/01

9/4/01

9/18/01

10/2/01

10/16/01

10/30/01

11/13/01

11/27/01

12/11/01

12/25/01

1/8/02

1/22/02

2/5/02

2/19/02

3/5/02

3/19/02

4/2/02

4/16/02

4/30/02

5/14/02

5/28/02

Fee

t N

AV

D88

Napa Slough @ MC Outlet

Pond 8 Canal @ MC

Pond 7A @ MC

Pond 7 @ MC

Mixing Chamber

Pond 8

Pond 7 WSEL does not allow for continuous gravity flow into MC

4.00

4.20

4.40

4.60

4.80

5.00

5.20

5.40

5.60

5.80

6.00

2/2/2002 19:12

2/3/2002 0:00

2/3/2002 4:48

2/3/2002 9:36

2/3/2002 14:24

2/3/2002 19:12

2/4/2002 0:00

2/4/2002 4:48

2/4/2002 9:36

Time

Ele

veva

tio

n (

ft,

NA

VD

88)

Hudeman Slough

Napa Slough

Pond 8 Canal

Pond 7A

Pond 7

Mixing Chamber

Mud Slough

Pond 8

Pond 7A, Pond 8, and

Mixing Chamber

Pond 7 (Bittern)

The solution to the hydraulic issue

The solution to the hydraulic issue

Issue: Pond 7 WSEL Does Not Allow for Continuous Bittern Gravity Flow into MC

Increase WSEL

Lower WSEL

Maintain Dilution Ratio

Maximum Allowable Water Surface Elevations in Pond 7Maximum Allowable Water Surface Elevations in Pond 7

Top of Levee (7 – 9 ft NAVD88)

Wave runup (0.2 - 0.8 ft)

Emergency (0.5 ft)Storage WSEL (4.7 ft NAVD88)

LEVEEFreeboard (1 ft)

Recommendations• Target WSEL in P7 is 4.7 feet • Target WSEL in the Mixing Chamber < 4.7

feet

Pond Bottom (2-3 ft NAVD88)

Hydraulic simulation results Hydraulic simulation results

MIKE 11 model run Alt02_Iter09.res11

00:00:0015-4-2003

06:00:00 12:00:00 18:00:00 00:00:0016-4-2003

06:00:00 12:00:00 18:00:00 00:00:0017-4-2003

06:00:00 12:00:00 18:00:00

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

[feet] Time Series Water LevelPond 7A

Pond 7

Pond 8

Mixing Chamber

Napa Slough