franks tract project

Franks Tract Project

Ajay GoyalDepartment of Water Resources

August 9, 2007

Project Objective

To improve the water quality of export water and possibly benefit fisheries

Franks Tract Project - Alternatives

• Three Mile Slough

• West False River

West False River Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

Operable Gates

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

Operable Gates

San J

oaquin

Riv

er

Thr

ee M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

FLOOD TIDE

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

EBB TIDE

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

NET FLOW

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

NET FLOW EXPORTS FLOWS

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Three Miles Slough Alternative

FRANKS TRACT

San Joaquin River

False River

Old

R

i v

e r

Sacra

men

to R

iver

Close on EBB Tide

San J

oaquin

Riv

er

Thre

e M

ile S

l.

Obermeyer Gates

Obermeyer Gate - Cross Section

GATE PANEL IN LOWERED

POSITION

GATE PANEL IN RAISED

POSITION

Base ConditionThree Mile Slough - CLOSED

During Portion of Ebb Tide

Base Condition Three Mile Slough- CLOSED

Particle Tracking SummaryJune 1996

3000 Particles Released - Near Rio Vista

Net Daily Average Flow Diversion = 3000 cfs for July

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Jun1996

Count

0

1

2

3

4

5

6

7

CVP - BaseSWP - Base CVP - TMS Gate ClosedSWP - TMS Gate Closed

Possible Operations of Three Mile Slough Gate• Closed during portion of ebb tide

– Benefit Fisheries– Improve WQ– Can be used in lieu of DCC gates

• Complete closure for some time– Benefit Fisheries– Degrade WQ

• Closed on Portion of Flood Tide– ???

Important Points

• Strategically located between Sacramento River and San Joaquin River

• Capability to move net flows INWARD or OUTWARDS

• Three Mile Slough much smaller than Sacramento River

– Sacramento River - 2500 ft wide– Three Mile Slough - 550 ft wide

Discussion

Ajay Goyal

916-651-9823

agoyal@water.ca.gov