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