CONTENTS

Abstract
Introduction
Geographic Information System
Description of Spatial Data Base Documentation
Data-Base Contents

Geography

BENCHMARK
CANALS1912 (Fresh-water canals and pipelines, 1912)
CITIES (Cities)
DIVERSION1912 (Surface-water canal and pipeline diversions, 1912)
Land Use

LU1912 (Land use in 1912)
LU1927 (Land use in 1927)
LU1932 (Land use in 1932)
LU1950 (Land use in 1950)
LU1969 (Land use in 1969)
LUOX1988 (Land use in 1988)

PIPELINE (Pipelines)
Public Land Survey System

PLSS (Section lines)
PLSS_TR (Township and range lines)

QUADS_BND (7.5-Minute Quadrangle Boundaries)
ROADS (Roads)
WWTP_SITES (Wastewater-Treatment Facilities)

Geology

Aquifer Tops and Bases

OXN_TOP (Elevation contours of the top of the Oxnard aquifer)
OXN_BOT (Elevation contours of the bottom of the Oxnard aquifer)
MUGU_TOP (Elevation contours of the top of the Mugu aquifer)
MUGU_BOT (Elevation contours of the bottom of the Mugu aquifer)
LAS_TOP (Elevation contours of the top of the lower aquifer system)
LAS_BOT (Elevation contours of the base of the groundwater system)

BATHY (Offshore bathymetry)
FAULTS (Faults)
FOLDS (Synclines, anticlines, and monoclines)
GEOLOGY (Surficial geology)
SOILS (Soils)

Hydrology

Basins

BASINS_HU (Hydrologic subunits)
BASINS_GW (Ground-water basins)
BASINS_SW (Surface-water basins)

Gaging Stations

PRECIP_GAGE (Precipitation data collection stations)
STREAM_GAGE (Stream-gaging sites)

LAGOONS (Lagoons in 1904 and 1915)
STREAMS (Streams and lakes)

Well Information

CONSTRUCTION (Well-construction information)
QW.MASTER (Water-quality information)
MASTER.WL (Water-level information)
PUMP.ALL (Well-pumpage information)
WELLS_ALL (Wells locations)

WL1931 (Ground-water level, autumn 1931)

FIGURES
1-37. Maps showing:

1. Location of the Santa Clara-Calleguas Basin, and of the Southern California Regional Aquifer-System Analysis study area
2. Santa Clara-Calleguas Basin
3. Location of selected bench marks
4. Selected fresh-water canals and pipelines, 1912
5. Locations of selected cities
6. Location of selected surface-water canal and pipeline diversions, 1912
7. Selected land use in 1912
8. Selected land use in 1927
9. Selected land use in 1932
10. Selected land use in 1950
11. Selected land use in 1969
12. Selected land use in 1988 for the Oxnard quadrangle
13. Selected United Water Conservation District pipelines
14. Public Land Survey System lines in Santa Clara-Calleguas Basin
15. Township and range lines in Santa Clara-Calleguas Basin
16. 7.5-minute quadrangle boundaries
17. Selected roads
18. Discharge locations of selected wastewater-treatment facilities
19. Elevation contours of the top of the Oxnard aquifer
20. Elevation contours of the bottom of the Oxnard aquifer
21. Elevation contours of the top of the Mugu aquifer
22. Elevation contours of the bottom of the Mugu aquifer
23. Elevation contours of the top of the lower aquifer system
24. Elevation contours of the base of the ground-water system
25. Offshore bathymetry
26. Selected faults
27. Selected synclines, anticlines, and monoclines
28. Selected surficial geology
29. Selected soils
30. Hydrologic subunits
31. Selected ground-water basins
32. Surface-water basins
33. Location of selected precipitation stations
34. Selected locations of Ventura County and U.S. Geological Survey stream-gaging sites and miscellaneous measurement sites
35. Selected lagoons in 1904 and 1915
36. Selected streams and lakes
37. Wells used in Regional Aquifer-System Analysis study
38. Selected ground-water levels for autumn 1931 from State of California Department of Public Works

CONVERSION FACTORS AND VERTICAL DATUM

                                Multiply     By        To obtain

                      acre-foot (acre/ft)    0.4047    hectare
                                foot (ft)    0.3048    meter
gallon per minute per foot [(gal/min)/ft]    0.2070    cubic meter per second per meter
                                mile (mi)    1.609     kilometer
                        square mile (mi²)    2.590     square kilometer

Temperature is given in degrees Fahrenheit (°F), which can be converted to degrees Celsius (°C) by the following equation:

                               °C=5/9 °F-32).

Vertical Datum
Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)-a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929.

Abbreviation

mg/L     Milligram per liter

Copies of this report are available from:

U.S. Geological Survey
Branch of Information Services
Box 25286
Denver Federal Center
Denver, CO 80225