WSPC02908

• File Number: 8282.750
• Description: Colorado River Operations And Accounting - California 4-4 Plan
• State: CA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1998
• Author: Unknown
• Title: Colorado River Board 4-4 Plan - California Water Update Plan - Bulletin 160-98 - Public Review Draft - Volume I - Part II
• Water Supply Pro - Doc Type: Report/Study

Bulletin 160-98 Public Review Draft

OGJ181

California Water Plan

Factors Affecting Urban Per Capita Water Use .......... . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Urban Water Conservation Actions. ...................................... 4-13

Effects of Droughts on Water Use. .. .. .. . . .. .. . . . . . . . . . ... . . . . . .. .. .. . . . . 4-16

Urban Water Use Planning Activities. ... ... .. .. . . .. ... .. . . . . . . ... . . .. . .. .. .. ... . 4"18

Urban Water Use Forecasting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

1995 per capita water use. ........... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

Per capita water use forecast for 2020. .................................... 4-21

Summary -- Urban Water Demands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-25

Agricultural Water Use ............................................................. 4-29

Crop Water Use ............................................................ 4-29

Factors Influencing Crop Water Use ............................................ 4-33

Agricultural Water Conservation Programs. ............................... 4-33

Irrigation Efficiencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4"35

Agricultural Acreage Forecasting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37

Quantifying Present Irrigated Acreage ................................... 4-37

Forecasting Future Irrigated Acreage ..................................... 4"43

Other Factors Affecting Forecasted Irrigated Acreage . . . . . . . . . . . . . . . . . . . . . . . . 4-46

Results of2020 Acreage Forecast. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4"49

Agricultural Water Demands .................................................. 4"51

Environmental Water Use ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-52

Flows in Wild and Scenic Rivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4"52

Instream Flows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55

Factors Affecting Future Instream Flows .................................. 4-57
Instream Flow Summary .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59
Bay-Delta Outflow ............... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60
Hydrologic Setting. ................................................... 4-62
Delta Fish Species of Special Concern .. Anadromous and Resident Delta

Species ...................................................... 4-64

Quantifying Delta Outflow Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-67

Wetlands. . . ... .. . . . . . . . . . .. . ... . .. . . . . . . .. . .. . . . . . . ... . . ... . . . . . . . . . .. . .. . 4-68

Wetlands Policies and Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68
Refuge Water Conservation Programs .................................... 4-72
Wetlands Water Demands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72
Summary of Environmental Water Demands ............................................ 4-74

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