Status Reports
on
Technical Studies
for the
Storage and Conveyance Refinement Process
Alternatives 3A, 3B

Delta Modeling Section
DWR Modeling Support Branch
October 2, 1997

Introduction

DWR Modeling Support Branch has been conducting computer modeling studies to support CALFED. Using DWRDSM1, Delta simulations of two of CALFED's alternatives have been completed. The purpose of this report is to present and describe recent results related to this process.

Presented first is a brief description of the new alternatives modeled, a description of the Delta hydrology used, and a summary of the operating assumptions used. The format of the presentation is intended to be consistent with that shown in Status Report on Technical Studies for the Storage and Conveyance Refinement Process: Delta Simulation Model Studies of Alternatives 1A, 1C, 2B, 2D, 2E, 3E, August 4, 1997.

Alternative 3A assumed a 5,000 cfs isolated facility with an intake on the Sacramento River at Hood. North Delta channel improvements were assumed the same as in Alternative 3E and south Delta facilities were the same as in Alternative 1C (Figure 1).

Alternative 3B assumed the same features as Alternative 3A but also included the in-Delta storage component. This component assumed the use of flooded Bacon Island, Woodward Island, and Victoria Islands as storage and conveyance to Clifton Court Forebay (Figure 2). Diversion pumps of 5,000 cfs capacity were assumed installed on Middle River at the northeast corner of Bacon Island, Middle River at Woodward Canal, and Old River at Woodward Canal.

The hydrology, boundary tide, and forebay intake gate operation used for there studies were described in the earlier report of August 4, 1997, namely the hydrology from study 472B and the 19-year mean tide at Martinez were used. Table 1 lists the monthly average Delta inflows and Table 2 lists the monthly average salinity at the Delta boundaries. Table 3 & Table 3A summarizes the operation of the Delta Cross Channel and the south Delta flow control and fish control structures. The strategy of operating the isolated facility and the in-Delta storage component is shown in Figure 3 and the monthly flow in the isolated facility is listed in Table 4.

Following this brief summary of the assumptions used in this study, Delta modeling results are then presented with respect to four parameters: Delta flows and velocities, Delta circulation patterns, Delta salinity, and water levels in the south Delta. Delta circulation patterns are presented using average flow directions and mass tracking studies. Delta salinity is shown using end of month total dissolved solids and the X2 location.

DELTA FLOWS

Figure 4

Tables 5 - 24 Monthly average flows for Alternatives 3A, 3B

DELTA CIRCULATION

Figures 5, 6, 7, 8, 9, 10, 11, 12 Alternative 3A flow patterns

Figures 13, 14, 15, 16, 17, 18, 19, 20 Alternative 3B flow patterns

Figure 21 Location of Discrete Injection Points for Mass Tracking Study

Figure 22 Regions for Mass Tracking Studies

Tables 25 - 40 Mass Tracking Results for Alternatives 3A, 3B
(25, 26, 27, 28, 29, 30, 31, 32 )
( 33, 34, 35, 36, 37, 38, 39, 40)

DELTA SALINITY

Figure 23 Output Locations for End of Month Salinity

Tables 41 - 64 End-of-Month Salinity for Alternatives 3A, 3B

Tables 65, 66  End of Month X2 location for Alternatives 3A, 3B

SOUTH DELTA WATER LEVELS

Figure 24 Location Minimum Water Levels Listed

Tables 67 - 76  Minimum Water Levels for Alternatives 3A, 3B