Download - 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
