DEPARTMENT OF FISH AND GAME GIS METADATA -- SWRCB GIS Support -- DRAFT -- STATE WATER RESOURCES CONTROL BOARD and REGIONAL WATER QUALITY CONTROL BOARD HYDROLOGIC BASINS AND NAMES COVERAGE NAME: hbasa3 COVERAGE PATH: dfghost:/gdata1/project/calwater METADATA FILE: hbasa3.txt METADATA DATE: December 8, 1995 COVERAGE DESCRIPTION The coverage hbasa3 was prepared by the California Department of Fish and Game (DFG) as a task within an interagency agreement for geographic information system (GIS) support to the California State Water Resources Control Board (SWRCB) Non-Point Source (NPS) Unit. Hbasa3 is a statewide version of the Teale GIS Technology Center (Teale) County Library data layer for hydrologic basins, called hbasa. DFG performed various corrections to the original data, such as basin coding, sliver polygon removal, and digitizing of missing boundaries. The intended use of hbasa3 is as an interim, digital reference map, accurately (but not precisely) corresponding to SWRCB-delineated basins, and as a cross-reference to the following hydrologic basin delineation systems: U.S. Geological Survey, Hydrologic Unit Map--1978, State of California (USGS, 1978), California Department of Water Resources (DWR) Areal Designations map of February 10, 1981, and "Hydrologic Data", Bulletin 130-85 (DWR, May 1988). See the related database swrcbhc.dbf, which contains all Regional Water Quality Control Board (RWQCB) surface hydrologic basin names and codes as published by the SWRCB on the Hydrologic Basin Planning Area (HBPA) map series (1:500,000-scale; SWRCB, 1973, as revised). Documentation (metadata) on this database is contained in the file swrcbhc.txt. See also metadata file calwater.txt for a description of the California Department of Forestry and Fire Protection (CDF) Planning Watersheds (CALWATER), which are further subdivisions of the SWRCB basin delineations. See also California Teale GIS Technology Center (Teale) ARC/INFO coverages and metadata (hbasa.txt) and DFG refinements of federal hydrologic unit codes (USGS HUCs, 1978) (hucdfg1.txt). CALWATER, USGS, SWRCB, and DWR surface hydrologic basin delineations are being reviewed by the California Interagency Hydrologic Basin Map Committee, Chaired by the California Department of Water Resources. Basin names, codes, and boundary delineation reviews are expected to be completed within fiscal year 95/96. This coverage and the 1:500,000- scale SWRCB maps and the Teale GIS library "hbasa" coverages will be superceded by the CALWATER system, digitized on a 1:24,000-scale base (USGS 7.5'-series quadrangles), as modified by DWR and Teale. See also DATA QUALITY ASSESSMENT section below. VITAL STATISTICS Datum: NAD 27 Projection: Albers Conic Equal-Area (Teale Standard) 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: Teale GIS Technology Center "hbasa" Source Media: ARC/INFO coverages, tiled by county Source Projection: as above Source Units: as above Source Scale: 1:500,000 Capture Method: manual digitizing Conversion Software: ARC/INFO rev. 7.0.3 Data Structure: Vector ARC/INFO Coverage Type: Polygon ARC/INFO Precision: Single ARC/INFO Tolerances: N/A Number of Polygons: 990 Number of Arcs: 2886 Layer Size: appx. 3.3 megabytes (uncompressed export) Data Updated: under development (December 1995) DATA DICTIONARY Structure of table HBASA3.PAT (standard ARC/INFO fields AREA, PERIMETER, HBASA3#, and HBASA3-ID are not described here; details on codes follow the table structure) COL ITEM NAME WIDTH TYPE N.DEC DESCRIPTION 17 BASIN 5 I - integer form of SWRCB code (w/o decimal) 22 NHCODE 6 N 2 numeric representation of SWRCB HSA code 28 ADCODE 6 C - DWR Areal Designation code (Bulletin 130-85) 34 CHBPA 2 C - Hydrologic Basin Planning Area code 36 CHUNAME 50 C - SWRCB Hydrologic Unit (HU) name 86 CHANAME 50 C - SWRCB Hydrologic Area (HA) name 136 CHSANAME 50 C - SWRCB Hydrologic Sub-Area (HSA) name 186 CHUCODE 6 C - SWRCB HU code as character string 192 CHACODE 6 C - SWRCB HA code as character string 198 CHSACODE 6 C - SWRCB HSA code as character string 204 R 1 I - integer code for SWRCB Hydrologic Region 205 RU 3 I - integer combining Region and HU codes 208 RUA 4 I - combines Region, HU, and HA 212 RUAS 5 I - combines Region, HU, HA, and HSA (same as BASIN, as present in original Teale "hbasa" coverage) 217 SPLITCU 2 I - Flag indicating that 1, 2, or 3 CUs overlap a given SWRCB HU, HA, or HSA 219 CU 8 I - USGS Cataloging Unit (aka Hydrologic Unit Code, HUC) see below. 227 CUNAME 48 C - Descriptive basin name of USGS CU 275 CU2 8 I - Secondary CU overlapping a given SWRCB basin 283 CU3 8 I - Tertiary CU overlapping a given SWRCB basin Structure of table HBASA3.AAT (standard ARC/INFO fields are not described here) COL ITEM NAME WIDTH TYPE N.DEC DESCRIPTION 29 ARCID 4 B - Unique identifier of each arc; used for edits 33 LEVEL 1 I - Flag indicating highest level of basin that arc delineates: 0 = state boundary (same as CALBY = 1) 1 = Hydrologic Region 2 = Hydrologic Unit 3 = Hydrologic Area 4 = Hydrologic Sub-Area 34 CALBY 1 I - Flag indicating arc is part of state boundary (including Channel Islands and others) SWRCB HYDROLOGIC BASIN CODES (items ..HSA.. etc.) SWRCB Hydrologic codes are 6-byte strings composed of numbers and a decimal point. The meanings associated with each byte position and the decoding of a typical code are shown below. Allowable value ranges shown in parentheses. The first byte (first position in the code string) indicates the Hydrologic Region (there are 9 statewide). Other byte positions are described below. A code ending in .00 indicates an entire major river basin, called a Hydrologic Unit (HU) (e.g. 105.00 - KLAMATH RIVER HYDROLOGIC UNIT). Large tributaries of major rivers are designated as Hydrologic Areas (HA), and their codes end in a single zero. In turn, HAs are subdivided into Hydrologic Sub-Areas (HSA), and a single digit replaces the last zero in the HA code. HSA codes ending in zero or double zeroes indicates that that the HA or HU is not subdivided (see further explanations under CHSANAME below). Byte(s) Meaning Value Range 1 Hydrologic Region (R) (1 <= R <= 9) 2,3 HYDROLOGIC UNIT (HU) (00<= HU <=59);(=81)* 4 always a decimal point (.) 5 Hydrologic Area (HA) (0 <= HA <= 9) 6 Hydrologic Sub-Area (HSA) (0 <= HSA<= 9) Example: Scott Bar HSA (105.41) 1 = North Coast 05 = KLAMATH RIVER (1-digit HUs include leading zero) 4 = Scott River Hydrologic Area 1 = Scott Bar NOTE: Regions 4 and 8 use county lines to "split" some of their HUs. * See 481.21, 845.15, etc and REMARKS(4). In Region 5, HU values 28, 29, 30, 46 thru 50 inclusive, are skipped. Normally, HUs and HAs are subdivided into lower categories (HUs are divided into HAs, HAs are divided into HSAs). Some HUs and HAs are not subdivided. Examples: Name Code Name Code LUCERNE LAKE HU 701.00 Blue Lake HA 109.10 JOHNSON HU 702.00 Ruth HA 109.40 BESSEMER HU 703.00 Suisun Bay HA 207.10 Byte position 1 contains the numeric code of the SWRCB Hydrologic Regions: R Hydrologic Region Name CHBPA (Hydrologic Basin Planning Area) --- ------------------------ --------------------------------------- 1 = North Coast NC 2 = San Francisco Bay SF 3 = Central Coast CC 4 = Los Angeles LA 5 = Central Valley SB = Sacramento 5 = Central Valley SJ = San Joaquin 5 = Central Valley TL = Tulare Lake 6 = Lahontan NL = North Lahontan 6 = Lahontan SL = South Lahontan 7 = Colorado River Basin CR 8 = Santa Ana SA 9 = San Diego SD Note: The Central Valley and Lahontan Hydrologic Regions are subdivided into Hydrologic Basin Planning Areas (HBPA), each with separate names and maps. All other HBPA names are the same as Hydrologic Region names. The numeric sequence of Hydrologic Unit (HU) codes is continuous across Central Valley HBPAs, except for skipped values 528, 529, 530, and 546 through 550 inclusive. HUs 535 and 545 have the same name (San Joaquin Valley Floor), as do HUs 551, 557, and 558 (South Valley Floor). DWR AREAL DESIGNATION CODES (item ADCODE) Areal Designation codes used in coverage hbasa3 were copied from a hardcopy DWR map dated February 10, 1981. The map codes were cross-checked with those contained in "Hydrologic Data", DWR Bulletin 130-85 (DWR, May 1988). Other versions of the DWR system may be in use (see DWR Bulletin 230 and other series). Discrepencies between the above two sources are listed in the APPENDIX below. DWR uses one letter to designate a "Hydrologic Basin" (HB) in byte position 1 of item ADCODE. These letter codes correspond to the SWRCB Hydrologic Regions (HR) and Hydrologic Basin Planning Areas (HBPA, see table below). As with the SWRCB system, the DWR Areal Designation codes ending in .00 indicate entire Hydrologic Units (HU) (e.g. W14.00 - CHEMEHUEVIS HYDROLOGIC UNIT), and codes ending in double or single zeroes indicate undivided Hydrologic Units or Areas. DWR Areal Designation Byte(s) Meaning Value Range 1 Hydrologic Basin (HB) (A <= HB <= Z) see below 2,3 Hydrologic Unit (HU) (00<= HU <=??) 4 always a decimal point (.) 5 Hydrologic Area (HA) (0 <= HA <= Z) 6 Hydrologic Sub-Area (HSA) (0 <= HSA<= 9) DWR SWRCB SWRCB HB HR HBPA HR / HBPA Name F 1 NC North Coast E 2 SF San Francisco Bay T 3 CC Central Coast U 4 LA Los Angeles A 5 SB Central Valley / Sacramento Basin B 5 SJ Central Valley / San Joaquin C 5 TL Central Valley / Tulare Lake G 6 NL Lahontan / North Lahontan W 6 SL Lahontan / South Lahontan X 7 CR Colorado River Basin Y 8 SA Santa Ana Z 9 SD San Diego Examples: DWR SWRCB ADCODE HSA HSA Name F05.D1 = 105.41 = Scott Bar HSA A07.B1 = 520.21 = Colusa Trough HSA B06.B0 = 541.20 = Los Banos HA C01.T0 = 558.80 = North Kern HA Z07.D3 = 907.43 = Cuyamaca HSA Byte positions 2 and 3 of the Areal Designation do not always match in numeric value to the corresponding SWRCB HU codes. In byte position 5 of the DWR code, the letters A, B, C, etc sometimes correspond with SWRCB HA codes 1, 2, 3, but not always. See the table in the APPENDIX showing the discrepencies discovered to-date among these various coding systems. Additional metadata on the Areal Designation system may be available from DWR. USGS HYDROLOGIC UNIT CODES (items CU and CUNAME) Hydrologic Unit Codes were developed nationwide by the U.S. Geological Survey (USGS). The codes are associated with delineations of hydrologic divides between major river basins defined above river confluences, state boundaries, and long-term gaging stations. California encompasses approximately 160 coded basins, which are used for reporting of federal water and agricultural statistics. These basin delineations are designed to be used as administrative reporting units only. These delineations should not be used to define authoritative drainage area above a given point as a portion of their definition includes non-physical boundaries. USGS Hydrologic Unit Codes (HUC) consist of a hierarchy of numeric basin identifiers. The most detailed level in the system is the Cataloging Unit, an 8-byte integer. The meanings associated with each byte position and the decoding of a typical code are shown below. Allowable value ranges in California and neighboring states are shown in parentheses. Byte Meaning Value Range 1,2 Hydrologic Region (18-CA, 17-OR, 16-NV, 15-AZ) 3,4 Sub-Region (01 thru 10, plus 1712) 5,6 Accounting Unit (00, 01, 02, 03) 7,8 Cataloging Unit (CU) (01 thru 29) Example: 18 California Region 1802 Sacramento Sub-Region 180200 Upper Sacramento Accounting Unit 18020004 McCloud Cataloging Unit (CU) Coverage hbasa3 items CU and CUNAME, the USGS codes and names in California and in portions of neighboring states, were compiled from the following sources: Hydrologic Unit Maps. Water Supply Paper 2294. USGS 1986. 63 pp. Hydrologic Unit Map--1978, State of California. (1:500,000--2 sheets). See also ARC/INFO coverage hucdfg1, developed by the California Department of Fish and Game, for USGS CU boundaries compatible with the 1:100,000- scale digital hydrography distributed by Teale. DATA QUALITY ASSESSMENT The following comments regarding the data quality of coverage hbasa3 are a mixture of quantitative and subjective, qualitative statements. Coverage hbasa3 attribute tables of watershed basin codes and names are very accurate. Basin boundary delineations, however, are not precise with respect to lines representing river networks, such as the 1:100,000 USGS Digital Line Graphs (DLG) of hydrography. This is due to the small scale of digitizing of hbasa3 (1:500,000). All SWRCB hydrologic names and codes were verified for consistency with 1:500,000-scale, SWRCB-published maps as of their August 1986 revision. Regional (RWQCB) and State (SWRCB) Boards have performed subsequent revisions. Expect updates of the coverage hbasa3 and the database swrcbhc.dbf and this metadata file (see also SWRCB MAP REVISION HISTORY section in the APPENDIX below). USGS Hydrologic Unit Codes and names were verified for all basins wholly or partially contained within California. Several discrepencies among the above basin coding systems have been discovered to-date. For example, maps in Bulletin 130-85 do not contain some of the basin polygons contained in the map of 2-10-81 (coverage hbasa3 employs the DWR codes of 2-10-81). Other basin coding discrepencies are described in the APPENDIX below. Users are cautioned to examine the boundaries of basins in their areas of interest for consistency with CALWATER delineations (undocumented discrepencies may exist as CALWATER development progresses). DFG eliminated two polygons from the SWRCB source coverages from Teale. In both cases, these polygons were artifacts, inadvertently formed by the connection of reservoir shorelines with the surrounding basin boundary (see Pine Flat Reservoir HSA 552.32 and Lake Kaweah HSA 553.44). Humboldt, San Diego, and Mission Bays, unlike San Francisco, San Pablo, and Tomales Bays, are not formally coded by the SWRCB/RWQCB system. The relationship between the federal (USGS HUC) and state (DWR and SWRCB) basin delineations is not consistent statewide. In the North Coast, for example, several federal CUs may comprise a single state Hydrologic Unit (Klamath HU 105.00, Trinity HU 106.00), whereas in southern California, the converse is true: several state HUs comprise a single federal CU (San Diego CU 18070304). The majority of federal CUs can be assembled by mixtures of state HUs, HAs, and HSAs (conversely, most state basins 'nest' into the federal basins), with the following exceptions (coded in hbasa3 item SPLITCU): "NHCODE","ADCODE","CHUNAME","SPLITCU","CU","CUNAME","CU2","CU3" 309.70,T09.G0,SALINAS,2,18060011,ALISAL-ELKHORN_SLOUGHS,18060005 309.10,T09.A0,SALINAS,2,18060011,ALISAL-ELKHORN_SLOUGHS,18060005 309.20,T09.B0,SALINAS,2,18060011,ALISAL-ELKHORN_SLOUGHS,18060005 309.50,T09.E0,SALINAS,2,18060012,CARMEL,18060005 405.41,U05.D1,LOS ANGELES-SAN GABRIEL RIVER,2,18070105,LOS_ANGELES,18070106 405.15,U05.A5,LOS ANGELES-SAN GABRIEL RIVER,3,18070104, SANTA_MONICA_BAY, 18070105,18070106 506.20,A20.B0,SHASTA DAM,3,18020005,SACRAMENTO_HEADWATERS,18020004,18020003 506.10,A20.A0,SHASTA DAM,3,18020005,SACRAMENTO_HEADWATERS,18020004,18020003 514.21,A06.A2,AMERICAN RIVER,2,18020128,NORTH_FORK_AMERICAN,18020129, 514.23,A06.A1,AMERICAN RIVER,2,18020128,NORTH_FORK_AMERICAN,18020129, 518.11,A11.A2,FEATHER RIVER,2,18020121,NORTH_FORK_FEATHER,18020123, 518.12,A11.A1,FEATHER RIVER,2,18020121,NORTH_FORK_FEATHER,18020123, 554.22,C06.B2,KERN RIVER,2,18030001,UPPER_KERN,18030002 554.21,C06.B1,KERN RIVER,2,18030001,UPPER_KERN,18030002 801.11,Y01.A1,SANTA ANA RIVER,3,18070201,SEAL_BEACH,18070203,18070204 For example, within the SHASTA DAM HU, Shasta Lake Hydrologic Area (HA 506.10), is overlapped by three separate CUs (the CUNAME is provided only for the first CU). The above basin polygons in coverage hbasa3 have multiple label points to reflect the multiple overlaps. Users should contact their local Regional Water Quality Control Boards and Department of Water Resources District offices to obtain the most current basin delineations and codes of the respective agencies. CONTACTS Paul Veisze, Spatial Data Coordinator (metadata file author) Kaylene Keller, GIS Specialist Mariano Arana, GIS Specialist California Department of Fish and Game Technical Services Branch -- GIS Unit 1730 "I" Street, Suite 100 Sacramento, CA 95814 USA Phone: 916-323-1667 Fax: 916-323-1431 Email: pveisze@dfg.ca.gov kkeller@dfg.ca.gov marana@dfg.ca.gov REFERENCE CONTACTS Lee Neher, GIS Specialist Teale GIS Technology Center Sacramento, California Phone: 916-263-1321 Email: lee@gislab.teale.ca.gov Clay Brandow, Watershed Specialist California Department of Forestry and Fire Protection Sacramento, California Phone: 916-227-2663 Email: brandow_clay@fire.ca.gov Nasser Bateni, Division of Planning California Department of Water Resources Sacramento, California Phone: 916-653-9883 John Norton, Chief, Non-Point Source Unit State Water Resources Control Board Sacramento, California Phone: 916-657-0522 APPENDIX SWRCB MAP REVISION HISTORY CALWATER, USGS, and SWRCB surface hydrologic basin delineations are being reviewed by the California Interagency Hydrologic Basin Map Committee, Chaired by the California Department of Water Resources. Basin names, codes, and boundary delineation reviews are expected to be completed within fiscal year 95/96. The 1:500,000-scale SWRCB maps and their digital representations in the Teale GIS library will be superceded by the CALWATER system, which is digitized on a 1:24,000-scale base (USGS 7.5'-series quadrangles). The 12 SWRCB HBPA maps whose legend indexes of hydrologic names were used to compile the coverage hbasa3 and the database swrcbhc.dbf also contain revision information. This information is reproduced here for reference. This portion of the revision history is the same on each of the 12 maps: ("Standard Revisions" hereafter) April 1973 Revised: July 1976 Revised: August 1986 State Water Resources Control Board Surveillance and Monitoring Section T.E. Lavenda, P.E. (signature) Beyond the above annotation, individual map sheets differ in their content of additional revisions and notes. Text sections beginning with "REMARKS(n):" are comments by metadata author by Region, not part of the map contents. North Coast Region (1) The North Coast HBPA map available at this writing contained an additional revision entry and notes: Revised: July 1991 California Regional Water Quality Control Board North Coast Region Surveillance, Monitoring, and Planning Don F. Hoirup, Jr. (no signature) NOTE: 1. The names and areas shown on this map are the same as used by the Department of Water Resources (DWR) in their Bulletin 94 Series. 2. The 1980 updated names and areas shown on this map are in accordance with an agreement with DWR and U.S. Geological Survey. 3. Boundaries have been modified in areas 5.81, 5.82, 5.83; 7.10, 7.20; 11.21, 11.22, 11.23; 11.31, 11.32; 11.41, 11.42. These modifications are adjustments in boundary locations from map revision August 1986. REMARKS(1): The North Coast revisions do not result in code changes. The full Hydrologic Area (HA) and Hydrologic Sub-Area (HSA) codes involved are listed below by HYDROLOGIC UNIT for consistency with hbasa3.pat and with swrcbhc.dbf: KLAMATH RIVER REDWOOD CREEK EEL RIVER 105.81 107.10 111.21 105.82 107.20 111.22 105.83 111.23 111.31 111.32 111.41 111.42 As of July 20, 1995 the above boundary changes have not yet been included in the coverage hbasa3, nor in Teale's hbasa data layer, nor in CDF's CALWATER digital coverage of SWRCB boundaries. Expect additional boundary modifications in other SWRCB Hydrologic Regions. Note 2 may be referring to August 1986 revision, not 1980; or to a 1978 Interagency Agreement on basin names. Boundaries of DWR Bulletins 94-, 130-, and 230-series maps and those of the SWRCB do not always agree. San Francisco Bay Hydrologic Region (2) Standard Revisions; no additional Notes. Central Coast Region (3) Standard Revisions; no additional Notes. Los Angeles Region (4) Standard Revisions; additional Notes: NOTE: 1. The names and areas shown on this map are the same as used by the Department of Water Resources (DWR) in their Bulletin 130 Series except as noted below. 2. The numbering system used on this map is an adaptation of the numbering system used in the 130 Series. 3. The boundary between Region 8 and Region 4 follows the boundary between Los Angeles County and Orange or San Bernardino Counties, not the Hydrologic Boundary. The San Bernardino County line splits Hydrologic Unit 1 (Santa Ana River HU) so that Sub-Areas 481.21, 481.22, and 481.23 are legally in Region 4 but drain into Region 8. The Orange County line splits Hydrologic Unit 5 (Los Angeles-San Gabriel River HU) so that Sub-Areas 845.15, 845.61, 845.62, and 845.63 are legally in Region 8 but drain into Region 4. Therefore, a 5-digit number on the map indicates that a Regional Boundary divides a Hydrologic Unit, area, or subarea. In these cases the second digit is the number of the region from which the hydrologic area has been separated by the regional boundary. All other digits are described in the legend. 4. The 1986 updated names and boundaries shown on the map are in accordance with an agreement with DWR and US Geological Survey. REMARKS(4): Note 1 refers to DWR Bulletin 130 Series, titled "Hydrologic Data". See also DWR Bulletin series 94- and 230-. Note 2 refers to SWRCB code adaptation of the DWR "Areal Designation" system of basin coding as used in Bulletins 94, 130, and 230 (see Areal Designation system description in DATA DICTIONARY above). Central Valley Region (5), Sacramento Basin (SB) HBPA Standard Revisions; additional Notes: NOTE: 1. The 1986 revised numbers and boundaries shown on this map are in accordance with an interagency agreement between the State Board, the Department of Water Resources, and the U.S. Geological Survey. Central Valley Region (5), San Joaquin (SJ) HBPA Standard Revisions; additional Notes: NOTE: 1. (same as for SB HBPA above) 2. San Joaquin Valley Floor Hydrologic Unit includes Hydrologic Unit numbers 535 and 545. REMARKS(5/SJ): HU codes 535 and 545 have the same name. HU codes 528, 529, and 530 are skipped in the Central Valley sequence. Central Valley Region (5), Tulare Lake (TL) HBPA Standard Revisions; additional Notes: NOTE: 1. (same as for SB HBPA above) 2. South Valley Floor Hydrologic Unit includes Hydrologic Unit numbers 551, 557, and 558 due to the large number of Hydrologic Areas contained in this unit. REMARKS(5/TL): HU codes 551, 557 and 558 have the same name. HU codes 546 through 550 inclusive are skipped in the Central Valley sequence. Lahontan Region (6), North Lahontan (NL) HBPA Standard Revisions; additional Notes: NOTE: 1. The 1986 updated names and boundaries shown on this map are in accordance with an agreement with the Department of Water Resources and the U.S. Geological Survey. Lahontan Region (6), South Lahontan (SL) HBPA Standard Revisions; additional Notes: NOTE: 1. The names and areas shown on this map are the same as used by the Department of Water Resources (DWR) in their Bulletin 130 Series except as explained below. 2. The numbering system used on this map is an adaptation of the numbering system used in the 130 Series. 3. The 1986 updated names and boundaries shown on the map are in accordance with an agreement with DWR and the U.S. Geological Survey. REMARKS(6/SL): Note 1 refers to DWR Bulletin 130 Series, titled "Hydrologic Data". See also DWR Bulletins 94 and 230. Note 2 refers to SWRCB code adaptation of the DWR "Areal Designation" system of basin coding as used in Bulletin 230 and elsewhere. See REMARKS(4). Colorado River Basin Region (7) Standard Revisions; additional Notes, REMARKS: same as SL HBPA above. Santa Ana Region (8) Standard Revisions; additional Notes, REMARKS: same as Region 4 above. San Diego Region (9) Standard Revisions; additional Notes, REMARKS: same as SL HBPA above. [author's note] The Mission Viejo HA 901.20 has been subdivided into 8 new HSAs: 901.21 through 901.28 (Don Hoirup, RWQCB 9, personal communication, December 7, 1995). These changes are not yet present in coverage hbasa3. COMPARISON OF DWR AND SWRCB CODES Byte positions 2 and 3 of the DWR Areal Designation do not always match in numeric value to the corresponding SWRCB HU codes. In byte position 5 of the DWR code, the letters A, B, C, etc sometimes correspond with SWRCB HA codes 1, 2, 3, but not always. The table below shows the discrepencies discovered to-date among the above coding systems. Maps in Bulletin 130-85 do not contain some of the basin polygons contained in the map of 2-10-81. Coverage hbasa3 employs the DWR codes of 2-10-81. Additional metadata on the Areal Designation system may be available from DWR. AREA DESIGNATION HYDROLOGIC DATA REGIONAL WATER QUALIY MAP OF CALIFORNIA Bulletin 130-85 CONTROL BOARD (DWR, 2-10-81) (DWR, May 1988) (12 maps, SWRCB, 1986) FO2.A0 F02.A0 102.20 FO2.B0 F02.B0 102.30 F11.B2 F11.B2 111.23 F11.B3 F11.B3 111.22 T09.X0 T09.X0 317.00 T14.E2 -- 314.52 T14.E1 T14.E0 314.51 T15.B1 T15.C1 315.31 T15.B2 T15.C2 315.32 T15.B3 T15.C3 315.33 T15.B4 T15.C4 315.34 U05.F1 U05.F1 845.61 U05.F2 U05.F2 845.62 405.62 U05.F3 U05.F3 845.63 405.63 Z02.J1 Z02.I1 902.91 Z02.J2 Z02.I2 902.92 Z02.J3 Z02.I3 902.93 Z02.J4 Z02.I4 902.94 Z02.G4 -- 902.74 Z06.D0 * Z07.A1 * Z06.E0 * A14.A2 A14.A2 522.11 A14.A1 A14.A1 522.12 A14.B2 A14.B2 522.24 A14.B3 A14.B3 522.22 A14.C2 A14.C2 522.33 A14.C3 A14.C3 522.32 B09.B1 B09.B1 534.22 B09.B2 B09.B2 534.21 B08.K0 B08.K0 545.10 B08.L0 B08.L0 545.20 BO8.M0 B08.M0 545.30 W02.B0 W02.00 602.20 W02.A0 -- 602.10 W26.D0 W26.A4 626.40 W26.C0 W26.A3 626.30 W26.A0 W26.A1 626.10 W26.B0 W26.A2 626.20 W26.G0 W26.A7 626.70 W26.H0 W26.A8 626.80 W26.E0 W26.A5 626.50 W26.F0 ** W26.A6 626.60 W28.J0 W28.I0 628.90 X13.A0 X13.A0 713.40 X13.B0 X13.B0 713.10 X13.D0 -- 713.20 X08.A0 X08.A0 708.20 X08.B0 X08.B0 708.10 X17.D0 X17.00 717.40 X15.D0 X15.00 715.40 * Mission Bay, expect resolution of boundary discrepencies and addtional updates by RWQCB. ** Polygon doesn't appear on original hbasa coverage from Teale. CALWATER Review Users may wish to verify CALWATER consistency with the following HCODE (or CHSACODE) values: 111.21 526.44 637.31 518.41 508.10 509.63 536.20 537.10 535.90 405.62 845.62 405.63 845.62 630.30 506.10 515.10 535.40 Users should contact their local Regional Water Quality Control Boards and Department of Water Resources District offices to obtain the most current basin delineations and codes. -------------------------- end of file hbasa3.txt -------------------------