By Steven K. Predmore, Kathryn M. Koczot, and Katherine S. Paybins
U.S. Geological Survey Open-File Report 96-629
BASINS_HU
Description: Hydrologic subunits. Data type: POLYGON. Source: Modified from: (a) California Department of Water Resources, 1964, Names and areal code numbers of hydrologic areas in the Southern District: California Department of Water Resources, Office Report, 57 p., pl. 4. (b) United Water Conservation District, 1991a, Untitled: Unpublished map delineating groundwater basins in the United Water Conservation District: Ventura County, Calif. (on file with United Water Conservation District). (c)Greg Middleton, United Water Conservation District, written commun., 1991. Source scale: (a) 1:260,00 (b) 1:100,000 Source projection: (a) Unknown (b) Base map from U.S. Geological Survey 30- x 60-minute topographic quadrangles. Method of entry: Ground-water basin polygons were manually digitized from paper source maps using an Altek Datatab AC40 digitizing tablet, which has a resolution of 0.002 inch. The geographic features and control points (points of known coordinate locations) were digitized and transformed into real-world coordinates. Quality control: The coverage was plotted and compared with the source maps. Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift -3.5 million meters. Final update: February 1994 Description of variables: BASINS_HU polygon attribute table.
Variable Type Length Definition
BASIN Character 4 California Department of Water Resources identification number. NAME Character 30 Name of hydrologic subunit. BASIN_NAME Character 20 Abbreviated name.
Description: Selected ground-water basins.
Data type: POLYGON.
Source: Modified from:
(a) California Department of Water Resources, 1964, Names
and areal code numbers of hydrologic areas in the Southern
District: California Department of Water Resources, Office
Report, 57 p., pl. 4.
(b) California Department of Water Resources, 1975a,
Compilation of technical information for the Ventura County
cooperative investigation: California Department of Water
Resources, v. II, 234 p., pl. 2.
(c) United Water Conservation District, 1991a, Untitled:
Unpublished map delineating groundwater basins in the
United Water Conservation District: Ventura County, Calif.
(on file with United Water Conservation District).
(d) Greg Middleton, United Water Conservation District,
written commun., 1991.
Source scale: (a) 1:260,000 (b) 1:126,720 (c) 1:100,000
Source projection: (a) Unknown (b) Unknown (c) Base map from U.S. Geological
Survey 30- x 60-minute topographic quadrangles.
Method of entry: Ground-water basins polygons were manually digitized from
source maps using an Altek Datatab AC40 digitizing tablet,
which has a resolution of 0.002 inch. The geographic
features and control points (points of known coordinate
locations) were digitized and transformed into real-world
coordinates.
Quality control: The coverage was plotted and compared with the source maps.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: July 6, 1994
Description
of variables: BASINS_GW polygon attribute table.
Variable Type Length Definition
NAME Character 20 Name of ground-water basin.
BASIN_ID Integer 3 Identification number.
ACRES Floating 9 Acreage.
decimal
Description: Surface-water basins.
Data type: POLYGON.
Source: Modified from:
(a) California Department of Water Resources, 1975a,
Compilation of technical information for the Ventura County
cooperative investigation: California Department of Water
Resources, v. II, 234 p., pl. 2.
(b) California Department of Water Resources, 1964, Names
and areal code numbers of hydrologic areas in the Southern
District: California Department of Water Resources, Office
Report, 57 p., pl. 4.
Source scale: (a) 1:126,720 (b) 1:260,000
Source projection: (a) Unknown (b) Unknown.
Method of entry: Surface-water basin polygons were manually digitized from
the paper source maps using an Altek Datatab AC40
digitizing tablet, which has a resolution of 0.002 inch.
The geographic features and control points (points of known
coordinate locations) were digitized and transformed into
real-world coordinates.
Quality control: The coverage was plotted and compared with the source maps.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: June 15, 1993
Description
of variables: BASINS_SW polygon attribute table.
Variable Type Length Definition
NAME Character 40 Name of surface-water basin from source (a).
SOURCE Character 7 Modifications made to source (a) data.
ID_SOURCE Character 4 Identification number from source (a).
GAGED? Character 2 Identifies basin as gaged or ungaged.
BASIN_ID Integer 3 Identification number.
Description: Location of selected precipitation stations.
Data type: POINT.
Source: Modified from:
County of Ventura Public Works Agency, 1990, Quadrennial
report of hydrologic data. 1985-1988: County of Ventura
Public Works Agency, variously paged.
Source scale: Not applicable.
Source projection: Geographic.
Method of entry: Data were obtained in latitude-longitude coordinates,
converted to a coverage, and transformed to Universal
Transverse Mercator projection coordinates.
Quality control: The coverage was verified with other information when
possible but was generally assumed to be without error.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: February 1, 1994
Description
of variables: PRECIP_GAGE point attribute table.
Variable Type Length Definition
GAGEID Integer 4 Gaging station numeric identification number.
LAT Integer 6 Latitude in degrees, minutes, and seconds.
LONG Integer 8 Longitude in degrees, minutes, and seconds.
ALT Numeric 5 Land-surface elevation, in feet above sea level.
LOCALID Character 8 Township, range, and section location of the station.
FIRSTYEAR Integer 5 The first year the precipitation station was in
operation.
STA.NAME Character 40 Name of each precipitation station.
Description: Selected U.S. Geological Survey and Ventura County
stream-gaging sites and miscellaneous measurement sites.
Data type: POINT.
Source: Modified from:
County of Ventura Public Works Agency, 1990, Quadrennial
report of hydrologic data. 1985-1988: County of Ventura
Public Works Agency, variously paged.
Source scale: Not applicable.
Source projection: Geographic.
Method of entry: Data were obtained in latitude-longitude coordinates,
converted to a coverage, and transformed to Universal
Transverse Mercator coordinates.
Quality control: The coverage was verified with other information when
possible but was generally assumed to be without error.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: February 1, 1994
Description
of variables: STREAM_GAGE point attribute table.
Variable Type Length Definition
GAGEID Integer 15 Station number.
VCFCD_ID Integer 3 Ventura County identification number.
LAT Integer 7 Latitude in degrees, minutes, and seconds.
LONG Integer 8 Longitude in degrees, minutes, and seconds.
ALT Numeric 8 Land-surface elevation, in feet above sea level.
DATA_TYP Character 1 Data collection instrumentation.
DATA_PER Character 15 Frequency of data collection.
DATE Character 9 Installation date.
GAGE_TYPE Character 3 Recording device or method.
DRAIN_AREA Numeric 8 Drainage basin area upstream from the gaging
station.
STATION_NAME Character 50 Descriptive station name, including stream name.
Description: Selected lagoons in 1904 and 1915.
Data type: POLYGON.
Source: Modified from:
Weber, F.H., Kiessling, E.W., Sprotte, E.C., Johnson, J.A.,
Sherburne, R.W., and Cleveland, G.B., 1976, Seismic hazards
study of Ventura County, California: California Department
of Conservation, California Division of Mines and Geology
Open-FileReport 76-5, 396 p., pl. 3A.
Source scale: 1:48,000
Source projection: Based on U.S. Geological Survey 7.5-minute topographic
quadrangles.
Method of entry: Lagoon polygons were manually digitized from a mylar source
map using an Altek Datatab AC40 digitizing tablet, which
has a resolution of 0.002 inch. The geographic features and
control points (points of known coordinate locations) were
digitized and transformed into real-world coordinates.
Quality control: The coverage was plotted and compared with the source map.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: April 2, 1992
Description
of variables: No variables were added.
Variable Type Length Definition
-- -- -- --
Description: Selected streams and lakes.
Data type: LINE.
Source: Modified from:
U.S. Environmental Protection Agency, 1994, EPA reach file
version 3.0 Alpha Release (RF3-Alpha): U.S. Environmental
Protection Agency (Computer tape available from the U.S.
Environmental Protection Agency, 401 M Street SW (4503F),
Washington, DC 20460).
Source scale: 1:100,000
Source projection: Geographic.
Method of entry: Data were obtained in ARC/INFO interchange-file format and
imported into a coverage. Source digital data were provided
in latitude and longitude coordinates in decimal degrees.
Quality control: The coverage was verified with other information when
possible but was generally assumed to be without error.
Projection of data: Universal Transverse Mecator projection: Zone 11, Y-shift
-3.5 million meters.
Final update: October 6, 1992
Description
of variables: STREAMS line attribute table.
Variable Type Length Definition
NAME Character 20 Stream name.
