Bulletin 118 - Groundwater Basins and Subbasins, California, 2003
Abstract/Contents
- Abstract
- The polygon shapefile contains the boundaries of 515 groundwater basins and subbasins as defined by the California Department of Water Resources (Bulletin 118, 2003). Groundwater basins are represented as polygon features and designated on the basis of geological and hydrological conditions - usually the occurrence of alluvial or unconsolidated deposits. When practical, large basins are also subdivided by political boundaries, as in the Central Valley. Basins are named and numbered per the convention of the Department of Water Resources. The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR GIS Spatial Data Standards. DWR makes no warranties or guarantees, either expressed or implied, as to the completeness, accuracy or correctness of the data, nor accepts or assumes any liability arising from or for any incorrect, incomplete or misleading subject data.
- Purpose
- Bulletin 118 defines the recognized groundwater basins and subbasins throughout the State of California. The Bulletin 118 document provides information on these basins/subbasins and the nature and extent of groundwater occurrence and management within the State. The Bulletin 118 dataset makes the geographic locations and extent of the 515 basins/subbasins publically available, for use in external mapping/GIS applications.
Description
Type of resource | cartographic, software, multimedia |
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Form | Shapefile |
Extent | 4.857 |
Place | Sacramento, California, US |
Publisher | California. Department of Water Resources |
Publication date | 2015 |
Language | English |
Digital origin | born digital |
Map data | Scale not given. ; Custom projection W 124°27ʹ36ʺ--W 113°36ʹ5ʺ/N 42°1ʹ9ʺ--N 32°25ʹ41ʺW 124°21ʹ31ʺ--W 114°13ʹ33ʺ/N 42°14ʺ--N 32°32ʹ3ʺ, Scale not given ; EPSG::4326 |
Creators/Contributors
Creator | California. Department of Water Resources |
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Subjects
Subject | Groundwater |
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Subject | Basins (Geology) |
Subject | Aquifers |
Subject | Hydrogeology |
Subject | California |
Subject | 2003 |
Subject | Geoscientific Information |
Subject | Boundaries |
Subject | Inland Waters |
Genre | Geospatial data |
Genre | Cartographic dataset |
Bibliographic information
Attribute accuracy report | Horizontal positional accuracy was established by professional judgement. According to Bill Brewster, 100% of the linework is better than 10 mile accuracy. Some places are better than 10 mile accuracy. |
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Supplemental information | Origination of Data - The basin boundaries for the groundwater basin map were primarily defined using geologic contacts and hydrogeologic divides. Specifically, the identification of the groundwater basins was initially based on the presence and areal extent of unconsolidated alluvial soils identified on 1:250,000 scale geologic maps provided by the California Department of Conservation, Division of Mines and Geology. The identified groundwater basin areas were then further evaluated through review of relevant geologic and hydrogeologic reports, well completion reports, court-determined adjudicated basin boundaries, and contact with local agencies to refine the basin boundaries. Date - The latest version of DWR’s Bulletin 118 document is dated October, 2003, and is available at: http://www.water.ca.gov/groundwater/bulletin118/update2003.cfm The current dataset was updated at the time the latest Bulletin 118 document was produced, and is based on geological maps and other information available at that time. There have been minor corrections to the dataset since that time, as described in the data lineage. Additional Contacts - Contacts Statewide Data Steward: Brett Wyckoff Senior Engineering Geologist California Department of Water Resources Division of Integrated Regional Water Management (916) 651-9283 Brett.Wyckoff@water.ca.gov Region Office Data Sub-stewards: Northern Region Office Jonathan Mulder Engineering Geologist (530) 528-7423 Jonathan.Mulder@water.ca.gov North-Central Region Office Bill Brewster Engineering Geologist (916) 376-9622 Bill.Brewster@water.ca.gov South-Central Region Office Mike McKenzie Engineering Geologist (559) 230-3308 Charles.McKenzie@water.ca.gov Southern Region Office Matt Zimmerman Engineering Geologist (818) 500-1645 Matthew.Zimmerman@water.ca.gov Update Frequency: Changes to the dataset are made on an infrequent and irregular basis. Minor changes are occasionally made and will be documented in the metadata. Substantial changes, such as the extent of a basin boundary, must be completed as part of a public process, where the changes are proposed and public review and comment are welcomed before any changes are finalized. |
WGS84 Cartographics | This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection. |
Location | https://purl.stanford.edu/kt110sd4399 |
Access conditions
- Use and reproduction
- This item is in the public domain. There are no restrictions on use.
- Copyright
- This work is in the Public Domain, meaning that it is not subject to copyright.
Preferred citation
- Preferred citation
- California Department of Water Resources. (2015). Bulletin 118 - Groundwater Basins and Subbasins, California, 2003. California Department of Water Resources. Available at: http://purl.stanford.edu/kt110sd4399.
Collection
Groundwater Information Center, California: GIS Maps and Data
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