Groundwater Confined Zones: Santa Clara County, California, 2015
Abstract/Contents
- Abstract
- This polyline shapefile depicts centerlines for the Santa Clara and Llagas groundwater subbasins confinend boundary in the County of Santa Clara, California. These boundaries outline the portions of subbasins that contain confined aquifers. An aquifer that is bounded above and below by formations of distinctly lower permeability than that of the aquifer itself potentially resulting in the aquifer being confined under pressure greater than atmospheric pressure. If such a confined aquifer is tapped by a well, water will rise above the top of the aquifer and may even flow from the well onto the land surface. Water confined in this way is said to be under artesian pressure, and the aquifer is called an artesian aquifer.The Santa Clara Valley Water District manages an integrated water resources system that includes the supply of clean, safe water, flood protection and stewardship of streams on behalf of Santa Clara County's 1.8 million residents. This layer is part of a collection of GIS data for Santa Clara County, California.
- Purpose
- To delineate the confined-unconfined boundary of groundwater to determine where groundwater recharge occurs, as well as basic information necessary to manage and protect the quantity and quality of groundwater resources. This coverage can be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analyses of geospatial data.
Description
Type of resource | cartographic, software, multimedia |
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Form | Shapefile |
Extent | 0.01 |
Place | San Jose, California, US |
Publisher | Santa Clara Valley Water District (Calif.) |
Date valid | 2015 |
Publication date | 2015 |
Language | English |
Digital origin | born digital |
Map data | Scale not given. ; EPSG::2227 W 122°11ʹ23ʺ--W 121°27ʹ54ʺ/N 37°27ʹ32ʺ--N 36°55ʹ3ʺW 122°11ʹ22ʺ--W 121°27ʹ57ʺ/N 37°27ʹ16ʺ--N 36°55ʹ30ʺ, Scale not given ; EPSG::4326 |
Creators/Contributors
Creator | Santa Clara Valley Water District (Calif.) |
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Subjects
Subject | Hydrogeology |
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Subject | Groundwater |
Subject | Artesian basins |
Subject | Santa Clara County (Calif.) |
Subject | 2015 |
Subject | Geoscientific Information |
Subject | Location |
Genre | Geospatial data |
Genre | Cartographic dataset |
Bibliographic information
Supplemental information | California Department of Water Resources Bulleting 7 indicated that the delineation of confined (pressure zone) and the recharge area (unconfined zone) in Santa Clara County were primarily geologic, hydrogeologic, water level conditions, etc. (1). Geologic approach: The presences of blue clay as capping strata in a number of well logs were used as a criterion to delineate the pressure zone boundaries. (2). Hydrologic approach: The characteristics exhibited by unconfined and confined areas under different conditions of stress were utilized for differentiating between pressure and free groundwater bodies. (3.) A water level contour showing lines of equal change in groundwater elevation for the period of summer and fall 1949 indicated a positive changes in levels of confined groundwater and negative changes in the free groundwater zones. |
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Use limitation | None.These datasets were developed for use by the Santa Clara Valley Water District (SCVWD) for its internal purposes only, and were not designed or intended for general use by members of the public. SCVWD MAKES NO REPRESENTATION OR WARRANTY AS TO ITS ACCURACY, TIMELINESS, OR COMPLETENESS. SCVWD MAKES NO WARRANTY OF MERCHANTABILITY OR WARRANTY FOR FITNESS OF USE FOR A PARTICULAR PURPOSE, EXPRESSED OR IMPLIED, WITH RESPECT TO THESE PRODUCTS OR THE UNDERLYING DATA. Any user of this data, accepts same AS IS, WITH ALL FAULTS, and assumes all responsibility for the use thereof, and further covenants and agrees to defend, indemnify, and hold SCVWD harmless from and against all damage, loss, or liability arising from any use of this product, in consideration of SCVWD having made this information available.Independent verification of all data contained herein should be obtained by any user of these products, or the underlying data. SCVWD disclaims, and shall not be held liable for, any and all damage, loss, or liability, whether direct, indirect, or consequential, which arises or may arise from these products or the use thereof by any person or entity. |
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/tr237qg9938 |
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
- Santa Clara County, California. Planning Office. (2015). Groundwater Confined Zones: Santa Clara County, California, 2015. Santa Clara County, Calif. Planning Office. Available at: http://purl.stanford.edu/tr237qg9938.
Collection
Santa Clara County, California GIS Maps & Data
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