LIBRARY : CA
LAYER NAME : RWQCBDIST
COVERAGE NAME : RWQCBNDA
COVERAGE DESCRIPTION:
The 'RWQCBDIST' layer shows the boundaries of the Regional Water Quality
Control Boards (9) in California. These district boundaries coincide
with the boundaries of some of the hydrologic study areas delineated
by the Department of Water Resources. See the 'GRDWATERBASIN' layer
documentation for a fuller explanation of ground water basins and
hydrologic study areas.
VITAL STATISTICS:
Datum: NAD27
Projection: Albers
Units: Meters
1st Std. Parallel: 34 00 00 (34.0 degrees N)
2nd Std. Parallel: 40 30 00 (40.5 degrees N)
Longitude of Origin: -120 00 00 (120.0 degrees W)
Latitude of Origin: 00 00 00 (0.0 degrees)
False Easting (X Shift): 0
False Northing (Y Shift): -4,000,000
Source: Department of Water Resources
Division of Mines and Geology
Source Media: Mylar Maps
Source Projection: Lambert
Source Units: Meters
Source Scale: 1:250,000
Capture Method: Hand digitized
Conversion Software: ARC/INFO Rev. 5.0.1
Data Structure: Vector
ARC/INFO Coverage Type: Polygon
ARC/INFO Precision: Double
ARC/INFO Tolerances: 10 meters
Number of Features: 9,224
Layer Size: 12.385 MB
Last Updated: Summer 1994
DATA DICTIONARY:
DATAFILE NAME: RWQCBNDA.PAT
RECORD LENGTH: 56
Non-standard POLYGON attribute fields:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC
-------------------------------------------------------------
25 REGION 2 2 I -
27 NAME 30 30 C -
NOTE: Items common to all POLYGON coverages: AREA, PERIMETER,
RWQCBNDA# and RWQCBNDA-ID are not described here.
REGION = region number
NAME = region name
DATA QUALITY ASSESSMENT:
The following are subjective comments regarding this data.
These district boundaries are formed from groundwater basin boundaries
found in the 'GRDWATERBASIN' layer. The following comments come from the
documentation for the 'GRDWATERBASIN' layer:
"The State Water Resources Control Board traced selected formations from
250K USGS geologic maps onto mylar sheets. Because the USGS maps are
regarded as high-quality maps and because of the integrity of mylar, it
could be said that the resulting digitized coverage maintains good accuracy.
Some of the tracings on the mylar, however, seemed a bit jagged and, in
some cases, problems with horizontal rectification between USGS quads and
the mylars were solved by repositioning tics. The coverage is, therefore,
only of moderate quality."
Coding of Board names and numbers is complete and accurate.
DATA CONTACT:
Contact Name: Chet Egbert or Steve Flatt
Contact's Phone: 916-263-1649 / 916-263-1499