California Department of Water Resources (DWR) has released the Delta Conveyance Improvement Studies Summary Report for 2007. The purpose of this summary report is to present key findings for the CALFED programmatic record of decision (ROD) Stage-1 studies and reports prepared by DWR in cooperation with the U.S. Bureau of Reclamation (Reclamation) to evaluate Franks Tract, TDF, and DCC Reoperation project actions. You may find the summary report at the following link:
Table 1
Studies Completed under the Direction of DWR in Support of Project Work |
Title |
Prepared
by and
Date |
Focus Area |
Key Findings Page |
Screening Analysis of Delta Island Reclamation
Alternatives for Ecosystem
Restoration and Salinity
Reduction |
DWR
2000 |
Sherman Lake, Big
Break, and Franks
Tract |
Reclamation of flooded islands such as Franks Tract and Big Break can result in reduced salinity in adjacent channels and in the central and south Delta.
http://www.iep.ca.gov/suisun/modeling/ShermanStudy/Memo.html |
Flooded Islands Feasibility Study, Baseline Report (PDF Download 31.4MB) |
DWR
(EDAW)
2005 |
Franks Tract,
Lower Sherman
Lake, Big Break |
This report characterized baseline conditions in each of the flooded islands and identified design phase data gaps. |
Flooded Islands
Conceptual Alternatives
Report (PDF Download 2.7MB) |
DWR
(NHI)
2005 |
Lower Sherman
Lake, Franks
Tract, and Big
Break |
This report identifies a series of Franks Tract alternatives to be further evaluated based on potential for salinity reduction. |
Flooded Islands Pre-
Feasibility Study Report (PDF Download 22.4MB) |
DWR
(EDAW)
2005 |
Lower Sherman
Lake, Franks
Tract, and Big
Break |
This report identifies Franks Tract as the flooded island with the most potential to achieve goals of the Flooded Islands Project. It identifies and analyzes four alternatives to provide water quality, ecosystem, and recreation benefits. |
Flooded Islands Pre-
Feasibility Study, RMA
Delta Model Calibration
Report (PDF Download 9.8MB) |
DWR
(RMA)
2005 |
Bay-Delta east of
Martinez |
This report describes calibration accuracy of the RMA Delta Model for phase, amplitude, flow, and salinity and identifies areas where further calibration is needed. |
Flooded Islands Pre-
Feasibility Report,
Alternatives Modeling
Report (PDF Download 52MB) |
DWR
(RMA)
2005 |
Franks Tract and
connecting water bodies |
The East Levee and Two Gates Alternative was found to produce the greatest reductions in EC in Old River, but it increased salinity in Middle River. |
Flooded Islands Pilot
Project Study, Alternatives
Modeling Report (PDF Download 3.5MB) |
DWR
2006 |
Franks Tract
Region and south
Delta export
locations |
Modeling results indicate that salinity reduction benefits of the project would be greatest in dry water years when Suisun Bay is the dominant EC source. |
Technical Memorandum:
Analysis of an Adaptive
Management Framework to the Flooded Island Pre-
Feasibility Study (PDF Download 0.2MB) |
DWR
(NHI)
2006 |
Lower Sherman
Lake, Franks
Tract, and Big
Break (Flooded
Islands) |
This technical memorandum characterizes the flooded islands pre-feasibility study’s status relative to the adaptive management framework and provides a list of needed information for successful adaptive management. |
Technical Memorandum:
Hydrodynamic and Water
Quality Modeling for
Franks Tract Project
Alternatives (PDF Download 3.3MB) |
DWR
2007 |
Franks Tract,
adjacent channels,
and the central and south Delta |
Of the four alternatives modeled, only the Threemile Slough and the West False River alternatives provide salinity reduction in Victoria Canal in addition to other locations in the central and south Delta. |
Franks Tract Value
Engineering Study (PDF Download 1.6MB) |
DWR
2007 |
Franks Tract,
including
Threemile Slough
and False River |
This summary report recommends the West False River and Threemile Slough alternatives for further analyses. |
Technical Memorandum:
Long Term Water Quality
Modeling for Franks Tract
Project (PDF Download 0.2MB) |
DWR
2007 |
Franks Tract
region, central and
south Delta |
Modeling results show that the Threemile Slough alternative provides greater salinity reduction at the south Delta export facilities than the West False River alternative. |
Through-Delta Facility
White Sturgeon Passage
Ladder Study (PDF Download 1.3MB) |
DWR
(UC
Davis)
2007 |
North Delta |
The study resulted in the development of design criteria of a passage structure that helps wild adult white sturgeon to successfully migrate. |
Technical Memorandum:
Debris Rack Capture
Efficiency and Fish Passage (PDF Download 1.4MB) |
DWR
(UC
Davis)
2007 |
North Delta |
The study found that debris capture efficiency of trash racks is directly related to rack bar spacing and their installation angle. |
Through-Delta Facility
Prefeasibility Study, Draft
Memorandum (PDF Download 1.2MB) |
DWR
2007 |
Sacramento River
between Hood and
the Mokelumne
River |
A 4,000-cfs TDF project from Hood to the South Fork Mokelumne River would require a 12-mile-long unlined canal; an intake facility with a floating trash deflector, floodgates, a service bridge, a service road, a fish screen, a fish bypass canal, and a pumping plant; five bridges; and an outlet structure. It would cost $360 million. |
Through-Delta Facility
Value Engineering Study,
Final Report (PDF Download 4.1MB) |
DWR
2007 |
Sacramento River
between Hood and
Ryde |
This report presents TDF designs and analyzes them for cost and potential water quality benefits. Several alternatives are recommended for further consideration. Increasing DCC capacity may be the most cost-effective alternative to convey Sacramento River water to the central Delta. |
Technical Memorandum:
Modeling of Value
Engineering Study
Alternatives for the
Through-Delta Facility (PDF Download 0.2MB) |
DWR
2007 |
Sacramento River
between Hood and
Ryde and the
Mokelumne River |
Hood to the South Fork Mokelumne River and Sacramento River below Georgiana Slough to the South Fork Mokelumne River alignments produce the greatest modeled salinity reductions at Clifton Court Forebay. |
Technical Memorandum:
Modeling of a Delta Cross
Channel Gate Extension (PDF Download 0.3MB) |
DWR
2007 |
Sacramento River
at Hood |
A combination of the expansion of the DCC gate and the opening of constricted channels in the lower Mokelumne River would provide substantial water quality improvements in the south Delta. |
Table 2
Other (Non-DWR–Directed) Studies Relevant to Project Work |
Title |
Prepared
by and
Date |
Focus Area |
Key Findings Page |
Acoustic Tracking of Juvenile
Chinook Salmon Movement in
the Vicinity of the Delta Cross
Channel, Sacramento River,
California(PDF Download 80.7MB) |
USGS
2001 |
Sacramento River,
DCC |
The study showed that both diurnal and tidal cycles influence fish migration. |
Acoustic Tracking of Juvenile
Chinook Salmon Movement in
the Vicinity of Georgiana
Slough, Sacramento River,
California(PDF Download 66.7MB) |
USGS
2003 |
Sacramento River at
the confluence with
the DCC and
Georgiana Slough |
Study results indicate that the location of fish entering a confluence below a bend is influenced by the strength of secondary circulation patterns upstream of the confluence. |
Comparison of Relative
Abundance of Adult Chinook
Salmon in the Delta Cross
Channel, Georgiana Slough,
and Sacramento River (PDF Download 5MB) |
USFWS
2004 |
Sacramento River at
the DCC and
Georgiana Slough |
Returning adult chinook salmon use the DCC as a migration corridor less than either Georgiana Slough or the Sacramento River, and Georgiana Slough less than the Sacramento River. |
Movement of Juvenile Chinook
Salmon in the Vicinity of the
Delta Cross Channel, Fall
2001: Coded Wire Tag
Recovery Component (PDF Download 2.6MB) |
USFWS
2004 |
Sacramento River at
the DCC |
Proportions of CWT chinook salmon recovered in the Sacramento River and DCC were significantly different, with an average of 10% recovered in the DCC. |
Repeated Surveys by Acoustic
Doppler Current Profiler for
Flow and Sediment Dynamics in a Tidal River (PDF Download 12MB) |
USGS
2005 |
Sacramento River at
the confluence with
the DCC |
ADCP mapping of flow vectors and river bathymetry was conducted to help understand juvenile chinook salmon movement in the vicinity of the DCC. |
Relationship of Delta Cross Channel Gate Operations to
Loss of Juvenile Winter-Run Chinook Salmon at the CVP/SWP Delta Facilities (PDF Download 0.4MB) |
DFG
2006 |
Sacramento River,
DCC, and Georgiana
Slough |
The proportion of Sacramento River water diverted into the interior Delta via the DCC and Georgiana Slough is correlated with the proportion of juvenile winter-run chinook entrained at the pumps. |
Estimating the Abundance of Sacramento River Juvenile Winter-Run Chinook Salmon with Comparisons to Adult
Escapement (PDF Download 3.4MB) |
USFWS
2001 |
Sacramento River at
Red Bluff |
Estimates of escapement from carcass surveys were found to be a satisfactory replacement for Red Bluff Diversion Dam ladder counts. |
Draft Summary of Delta Hydrology Data, Water Years 1985–2004 (PDF Download 2.1MB) |
USGS
2004 |
Delta |
The Sacramento River contributed 84.5% of the fresh water to the Delta during the period examined. |
