County lines (a separate Teale data layer) and hydrography lines are not reconciled with each other and discrepancies between the two will occur when a county boundary follows a water feature.
-----
SUPPLEMENTARY INFORMATION (courtesy of Calif. Department of Fish and Game)
In 1993, US EPA changed the Reach File table DS2 to DS3 and changed
the MILE and related items from numeric type to character type.
No data content changes were made. DFG compiled over 150 US EPA
National Computer Center (NCC) CU-based DS3 tables into a set of
33 Teale tile-based tables in October 1996. DFG and cooperators
have also made extensive corrections and additions of primary names/name
codes in the DS3 tables. Forwarding
of these updates is expected in October 1996 to US EPA for inclusion
in RF3 final processing.
The DS3 item UPDTSRC1 concatenates HYSNUM and HSCKEY (in that order)
for those records that have a corresponding AAT record. UPDTSRC1
contains the value 9999 for DS3 records created by US EPA that have
no corresponding record in the hydrography layer. UPDTSRC1 contains
leading zeroes for
single-digit HYSNUM values. The Teale primary key, TDCKEY, is similar
to UPDTSRC1 except that the concatenation order is HSCKEY + HYSNUM."
"The hydrography layer was assembled from data originally published
by the U.S. Geological Survey (USGS) in Digital Line Graph (DLG-3)
format. DLG-3 data were generated by USGS from 1:100,000-scale maps
by manual digitizing and raster scanning. Approximately 3200 original
USGS DLG files were processed by Teale to create the statewide hydrography
data layer.
Edits to the original linework have been made during the data conversion
by Teale from the original DLG-3 format to the ARC/INFO(tm) GIS
format. Such changes include line movements (due to the map edge-matching
process), minor corrections of attribute coding, and the closing
of open polygons. Flow
direction for streams (feature type line) has also been added. Stream
arcs are flagged (where item FLOW = 1) to indicate whether or not
the direction of a given stream (line) has been defined and/or verified
by Teale.
Hydrography of the entire state is stored in 2 statewide coverages
and in 33 separate ARC/INFO coverages or tiles. Statewide coverage
names HYDRARCA (arc feature type) and HYDROPOLA (polygon feature
type). The tiles coverages whose individual boundaries correspond
to the USGS 1:250,000-scale quad series (see index coverage called
hydroindexa and index diagram below). Coverage
names consist of two unique characters plus a suffix -JHYSA. Most
of the two-letter codes abbreviate a quad name, for example: RDJHYSA,
for the Redding quad. The tiles are also numbered from 1 to 33,
northwest to southest, and this numeric code is contained in the
item HYSNUM. A separate item, HSCKEY,
contains a number unique to each arc within a tile. HSCKEY and HYSNUM
are combined to form a primary key item, TDCKEY, which uniquely
identifies every hydrography arc record statewide.
In 1992, the Teale hydrography data layer was sent upon request
to the U.S. Environmental Protection Agency (US EPA) Office of Water
for use as a basemap for the River Reach File version 3-alpha, also
known as Reach File 3 or RF3-alpha. RF3 is US EPA's national hydrographic
addressing system which contains unique water feature identification
codes, names, and update documentation. RF3 was developed by Horizon
Systems Corporation, under contract to the US EPA Office of Water.
RF3 as archived at Teale consists of
a separate data table for each of the 33 Teale hydrography coverages,
designated by the filename extension .DS3 (for example: RDJHYSA.DS3).
Hydrographic feature records in Teale's arc attribute tables (AAT) may be related (linked or joined) with corresponding RF3 records in DS3 tables on the item TDCKEY, which is present in both tables. Users are cautioned to verify the integrity of AAT - DS3 relations, as instances of many DS3 records relating to one AAT record are known to occur. Use of the relate item RF3RCHID in older versions of Teale AATs has been discontinued.
Statewide hydrographic feature records in Teale's polygon attribute table (PAT) may be related (linked or joined) with corresponding WRCB records in DAT table on the item wrcblakes, which is present in both PAT and DAT tables.
Reach File data, documentation, and technical support are provided through the US EPA Office of Water's STORET User Assistance Group at 800-424-9067. STORET is the US EPA's national water quality information system.
-----
UPDATES
December 1998
------------
Added in statewide polygon and line coverages, areas that were
removed from Nevada and Arizona. The "STATECODE" attribute
is also added to identify features
are:
1- Completely within CA
2- Partially with CA
3- Completely outside CA
PNAME and PNMCD attributes are added to the statewide line
feature coverage.
attributes were extracted from the Reach File DS3 table.
NAME attribute is added to the STATEWIDE and the TILE (250K
quad) polygon
coverages. Features included lakes, ponds, reservoirs, etc.,
the names were
manually entered based on the USGS's 100K quad maps. Names from
the 24K quad
maps and the DFG's lakes coverage were used respectively to
populate names
where names were not found on the USGS's 100K quad maps.
An additional database of lakes species/environment quality
and ecological
factors was attached to the statewide polygon coverage. New
item WRCBLAKES
in the PAT table will be is used to relate records to the HYDRPOLA.DAT
table.
The DAT table came from DFG's lakes coverage lakes.DAT table.
See table
description below for detail.
Added Appendix A (EPA River Reach File detail attribute descriptions)
to the
documentation.
November 1998
-------------
Posted current version of DS3 table with DFG's updates. Approximately
3400
records were updated. Names, name codes and RF3 identifiers
were entered and
corrected by DFG in cooperation with the CA Rivers Assessment
(CARA) program
at UC Davis. Updates were flagged in the item UPDTSRC2 in each
DS3 table.
Lookup tables contain descriptions of the hydrographic features
in the polygon
and line coverages. Tables are available for each of the 33
tile coverages and
the statewide Teale hydrography coverages. These separate lookup
tables carry
all the MINOR codes and a description for each. Lookup tables
are named
with an .LUT file name extension (for example: WEJHYSA.LUT).
May 1998
--------
Attribute updates in 6 quad coverages and in the statewide
polygon coverage.
Enhanced MINOR1 and MINOR2 codes.
ACJHYSA
SJJHYSA
SOJHYSA
FOJHYSA
ZPJHYSA
MZJHYSA
April 1997
----------
New edition of River Reach (DS3) files. DFG and UC Davis enhanced
RF3
attributes (primarily stream names and unique codes).
February 1997
-------------
DFG reported inconsistency in DLG MINOR1 coding in Amboy (100k
quad name),
99% of arcs were coded as WASHES. Apparently localized in a
single 100K
quad. Modification were made so the coding consistent with the
adjacent
quads. The changes were made to 2 coverages: NEJHYSA and KIJHYSA.
1996
----
The California Department of Fish and Game (DFG) assembled
the most current
RF3 tables from copies downloaded directly from US EPA's National
Computer
Center (NCC) in September 1996. These DS3 tables, organized
by hydrologic
basins, were appended and Teale tile-based tables extracted
from them.
A significant volume of water feature names/name codes and RF3
identifiers were input and corrected by DFG in cooperation with
the
California Rivers Assessment (CARA) program at UC Davis. All
such updates
are flagged in the item UPDTSRC2 in each DS3 table."
Statewide file, sorted in WRCBLAKES sequential order.
* = see below for unique codes
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC
-----------------------------------------------------
1 AREA 4 12 F 3
5 PERIMETER 4 12 F 3
9 WRCBLAKES# 4 5 B -
13 WRCBLAKES-ID 4 5 B -
17 F_G_CD 1 1 C - Need code
18 OWNER 34 34 C - Owner
52 OWNRTYPE 3 3 C - Owner Type
(Code): BPP, PRV, PUB
55 REC_NUM 40 40 C -
95 MAX_AREA 16 16 I - Maximum Area (Units??)
111 MXAREF 7 7 C - Code??
118 SUM_SURF 16 16 I - Summer Surface area??
134 S_S_REF 7 7 C -
141 MAXDEPTH 16 16 I - Maximum Depth (Units?)
157 M_D_REF 7 7 C -
164 AB_G_F1 20 20 C - something about fish species
184 AB_G_F2 20 20 C - ""
204 AB_G_F3 20 20 C - ""
224 OTH_NAM 25 25 C - Other Lake Name
249 DEP_FL 16 16 I -
265 DP_F_REF 7 7 C -
272 MIN_SURF 16 16 I - Minimum surface area??
288 M_S_REF 7 7 C -
295 PRI_PROD 16 16 I - Primary Productivity
311 L_Q_REF 7 7 C - empty
318 DAM 16 16 I - Dam?? (numeric)
334 D_NAME 25 25 C - Dam name
359 LATITUDE 9 9 C - Latitude
368 LATD 2 2 I - Latitude, Degrees
370 LATM 2 2 I - Latitude, Minutes
372 LATS 4 4 N 1 Latitude, Seconds
376 LONGITUD 10 10 C - Longitude
386 LOND 3 3 I - Longitude, Degrees
389 LONM 2 2 I - Longitude, Minutes
391 LONS 4 4 N 1 Longitude, Seconds
395 TOWNSHIP 13 13 C - Township
408 OPERATOR 25 25 C - Operator of Dam?
433 INFLOW1 15 15 C - Inflow Stream 1
448 INFLOW2 15 15 C Inflow Stream 2
463 INFLOW3 15 15 C - Inflow Stream 3
478 MAX_VOL 16 16 I - Maximum Volume (units)
494 M_V_REF 7 7 C -
501 MIN_VOL 16 16 I - Minimum Volume (units)
517 AV_DPTH 16 16 I - Average Depth (units)
533 A_D_REF 7 7 C -
540 N_G_FSH1 20 20 C - something with fish species
560 N_G_FSH2 20 20 C - ""
580 N_G_FSH3 20 20 C - ""
600 FISH_YLD 16 16 I - Fish Yield ? (units)
616 F_Y_REF 7 7 C -
623 FSH_CROP 16 16 I - Fish Crop?/
639 F_C_REF 7 7 C -
646 EUPHOT 4 4 C -
650 E_Z_REF 7 7 C -
657 THERMO 16 16 I -
673 COUNTY 40 40 C - County
*713 QUAD 12 12 C - Quadcodes?
725 OUTFLOW 15 15 C - Outflow Stream
740 DRN_AREA 16 16 I -
756 D_A_REF 7 7 C -
763 ELEVAT 16 16 I - Elevation of lake in feet
779 ELE_REF 7 7 C -
786 T_S_REF 7 7 C -
793 DOM_FSH1 20 20 C - Dominant Fish 1?
813 DOM_FSH2 20 20 C - Dominant Fish 2?
833 DOM_FSH3 20 20 C - Dominant Fish 3?
853 D_F_REF 7 7 C -
860 NUISANCE 24 24 C - Nuisance - Codes?
884 N_REF 7 7 C -
891 IMP_WTR 16 16 I -
907 I_W_REF 7 7 C - Empty
914 LKNAM_FM 25 25 C - Lake name
939 LAK_NM_F 16 16 I - Lake name code??
955 ACC_FMT 9 9 C - Open/closed/fee/desig
964 LAK_FMT 11 11 C - Lake/reservoir/etc/
975 ACCR_FM 8 8 C - time periods
983 CAL_FM 10 10 C - Empty
993 TRO_FM 12 12 C - trophic level???
1005 FISH_FM 13 13 C - Fish productivity??
1018 FSHRY_FM 7 7 C - Fishery temperature related?
1025 F_PLT_FM 8 8 C - Fish planting
1033 SIGN_FM 3 3 C - No/yes?? Sign for lake name
1036 STRAT_FM 3 3 C - No/yes??
1039 OFLO_FM 3 3 C - No/yes??
1042 N_PK_FM 19 19 C - National Park
1061 N_F_FM 14 14 C - National Forest
1075 W_P_FM 19 19 C - Wilderness area??
1094 DWR_FM 16 16 C - District??
1110 LAK_Q_FM 4 4 C - Lake quality
1114 LAKES 1 1 I - Matched to lakes.pat
1115 WRCBLAKES 4 5 B - Primary key"