Ground Water Aquifers

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Published by the Ministry of Environment and Climate Change Strategy - Water Protection and Sustainability
Licensed under Open Government License - British Columbia

Polygon features represent developed ground water aquifers in BC (that have been mapped). Most aquifer boundaries are delineated based on geology, hydrology and topographic information. Some aquifer boundaries stop at the border of BC mapsheet boundaries due to resource or data constraints at the time of mapping.

Data and Resources

Dataset Extent

Latitude: 48.0° to 60.0°
Longitude: -139.5° to -113.5°

Additional Information

Purpose

Spatial layer intended to identify developed aquifers, where ground water is vulnerable, the productivity of the aquifer and the demand in a specific aquifer, to assist in the management and protection of the ground water resource.

Data Quality
Lineage Statement

For the aquifer coverages, raw data such as well records, water quality data, reports, air photographs, and geologic maps are used to interpret the aquifers in a study area. The aquifer coverages are mostly interpretive.

Contact Information

NameAndarge Baye (businessExpert)
EmailAndarge.Baye@gov.bc.ca
OrganizationMinistry of Environment and Climate Change Strategy
Sub-OrganizationWater Protection and Sustainability

Access & Security

Who can view this dataset? Public
Who can download this dataset?Public

Metadata Information

Record Published 2011-03-09
Record Last Modified 2017-11-03
Resource Status onGoing

Object Description

Object Name: WHSE_WATER_MANAGEMENT.GW_AQUIFERS_CLASSIFICATION_SVW

Short Name: GW_AQUIFER
Comments: GW_AQUIFERS_CLASSIFICATION_SVW is a spatial view created as part of the WRBC WMS conversion.

Column Name Short Name Data Type Data Precision Comments
AQ_TAG AQ_TAG VARCHAR2 4 The AQ TAG is an alpha-numeric code assigned to the aquifer to uniquely identify it.
FCODE FEAT_CODE VARCHAR2 10 FCODE is a feature code is most importantly a means of linking a feature to its name and definition. For example, the code GB15300120 on a digital geographic feature links it to the name "Lake - Dry" with the definition "A lake bed from which all water has drained or evaporated." The feature code does NOT mark when it was digitized, what dataset it belongs to, how accurate it is, what it should look like when plotted, or who is responsible for updating it. It only says what it represents in the real world. It also doesn't even matter how the lake is represented. If it is a very small lake, it may be stored as a point feature. If it is large enough to have a shape at the scale of data capture, it may be stored as an outline, or a closed polygon. The same feature code still links it to the same definition.
PERIMETER PERIMETER NUMBER 12 PERIMETER is the outside perimeter of the aquifer measured in metres.
AQNAME AQNAME VARCHAR2 13 AQNAME is the name of the aquifer.
AREA AREA NUMBER 16 AREA is the area of the aquifer measured in square metres.
AQUIFER_NUMBER AQ_NUMBER VARCHAR2 16 AQUIFER NUMBER is a text field created from the AQUIFER_ID corresponding to the Aquifer Tag in GW_AQUIFERS.
AQUIFER_MATERIALS AQ_MATERLS VARCHAR2 18 AQUIFER MATERIALS is a broad grouping of geologic material found in the aquifer. Acceptable values are "Sand and Gravel", "Sand", "Gravel" or "Bedrock".
PRODUCTIVITY PRODUCTVTY VARCHAR2 12 PRODUCTIVITY represents an aquifer's ability to transmit and yield groundwater and is inferred from any combination of: the aquifer’s transmissivity values, specific capacity of wells, well yields, description of aquifer materials, and sources of recharge (such as rivers or lakes), or a combination. Acceptable values are "Low", "Moderate", "High".
VULNERABILITY VULNRABLTY VARCHAR2 13 VVULNERABILITY of an aquifer to contamination indicates the aquifer’s relative intrinsic vulnerability to impacts from human activities at the land surface. Vulnerability is based on: the type, thickness, and extent of geologic materials above the aquifer, depth to water table (or to top of confined aquifer), and type of aquifer materials. Acceptable values are "Low", "Moderate", and "High".
DEMAND DEMAND VARCHAR2 9 DEMAND describes the level of groundwater use and represents the level of reliance on the resource for supply at the time of mapping. Demand may be "Low", "Moderate", or "High".
AQUIFER_CLASSIFICATION AQ_CLASS VARCHAR2 30 AQUIFER CLASSIFICATION categorizes an aquifer based on its level of development (groundwater use) and vulnerability to contamination, at the time of mapping. For more information see J. Berardinucci and K. Ronneseth. 2002: Guide to Using The BC Aquifer Classification Maps For The Protection And Management Of Groundwater. Level of development of an aquifer is described as: "High" (I), "Moderate" (II), "Low" (III). Vulnerability is coded as "High" (A), "Moderate" (B), or "Low" (C) . For example, a class IA aquifer would be heavily developed with high vulnerability to contamination, while a IIIC would be lightly developed with low vulnerability.
ADJOINING_MAPSHEET DJNNGMPSHT VARCHAR2 3 ADJOINING MAPSHEET denotes if the spatial extent of the aquifer extends over more than one BC Geographic Series (BCGS) 1:20,000 scale mapsheet. Acceptable values are "Yes" and "'No".
AQUIFER_NAME QFRNM VARCHAR2 60 AQUIFER NAME for a specific aquifer is typically derived from geographic names or names in common use, but may also be lithologic or litho-stratigraphic units, e.g., ''Abbotsford-Sumas'', ''McDougall Creek Deltaic''.
AQUIFER_RANKING_VALUE QFRRNKNGVL NUMBER 25 AQUIFER RANKING VALUE is a points based numerical value used to determine an aquifers priority in terms of the level of development of ground water use. For more information see J. Berardinucci and K. Ronneseth. 2002: Guide to Using The BC Aquifer Classification Maps For The Protection And Management Of Groundwater. The ranking is the sum of the point values for each of the following physical criteria: productivity, size, vulnerability, demand, type of use, and documented quality concerns and quantity concerns. Ranking scores range from "Low" (5) to "High" (21).
DESCRIPTIVE_LOCATION DSCRPTVLCT VARCHAR2 42 DESCRIPTIVE LOCATION is a brief description of the geographic location of the aquifer. The description is usually referenced to a nearby major natural geographic area or community, e.g., "Grand Forks".
LITHO_STRATOGRAPHIC_UNIT LTHSTRTGRP VARCHAR2 78 LITHO STRATOGRAPHIC UNIT is the named permeable geologic unit (where available) that comprises the aquifer. It is typically either; the era of deposition, the name of a specific formation and\or the broad material types, e.g., "Paleozoic to Mesozoic Era", "Cache Creek Complex", "Intrusive Rock".
QUALITY_CONCERNS QUAL_CONCN VARCHAR2 40 QUALITY CONCERNS is the extent of documented concerns within the aquifer at the time of mapping. Quality concerns such as contaminants may be "Isolated", "Local", or "Regional" in extent. It is possible to have no quality concerns documented for a given aquifer.
AQUIFER_DESCRIPTION_RPT_URL DESC_R_URL VARCHAR2 91 AQUIFER DESCRIPTION RPT URL is the Uniform Resource Locator (URL) for the Aquifer Description report available in Portable Document Format (PDF). The date-stamped report describes characteristics of the aquifer such as: location, vulnerability, lithology and hydrological parameters.
AQUIFER_STATISTICS_RPT_URL STAT_R_URL VARCHAR2 91 AQUIFER STATISTICS RPT URL is the Uniform Resource Locator (URL) for the Aquifer Summary Statistics report available in Comma Separated Value (CSV) format. The date-stamped report provides a statistical summary outlining the characteristics of all wells associated within the aquifer, including average well depth and maximum rate of flow.
AQUIFER_SUBTYPE_CODE SBTYPE_CD VARCHAR2 10 AQUIFER SUBTYPE CODE specifies a standardized code which categorizes an aquifer based on how it was formed geologically (depositional description). Understanding of how aquifers were formed governs important attributes such as their productivity, vulnerability to contamination as well as proximity and likelihood of hydraulic connection to streams. Aquifer sub-type differs from AQUIFER CLASSIFICATION in that the later system classifies aquifers based on their level of development and vulnerability. Further details on aquifer sub-types can be found in Wei et al., 2009: Streamline Watershed Management Bulletin Vol. 13/No. 1.The code value is a combination of an aquifer type represented by a number and an optional letter representing a more specific aquifer sub-type. For example aquifer sub-type code 6b is a comprised of the aquifer type number (6: Crystalline bedrock aquifers) and subtype letter (b) specifically described as: Fractured crystalline (igneous intrusive or metamorphic, meta-sedimentary, meta-volcanic, volcanic) rock aquifers. Initial code values range from 1a to 6b.
QUANTITY_CONCERNS QUAN_CONCN VARCHAR2 40 QUANTITY CONCERNS is the extent of documented concerns within the aquifer at the time of mapping. Quantity concerns such as dry wells may be "Isolated", "Local", or "Regional" in extent. It is possible to have no quantity concerns documented for a given aquifer.
SIZE_KM2 SIZE_KM2 NUMBER 12 SIZE KM2 is the approximate size of the aquifer in square kilometers.
TYPE_OF_WATER_USE TYP_WTR_US VARCHAR2 21 TYPE OF WATER USE describes the type of known water use at the time of mapping which indicates the variability or diversity of the resource as a supply source. Water use categories include: 1) "Potential Domestic" may not be primarily used as a source of drinking water but has the potential to be in the future and should be protected for such use; 2) "Domestic" used primarily as a source of drinking water; and 3) "Multiple" used as a source of drinking water, plus extensively for other uses such as irrigation.
PRODUCTIVITY_CODE PROD_CODE VARCHAR2 6 PRODUCTIVITY CODE is a description of the relative volume of water being produced by the aquifer.
DEMAND_CODE DEMND_CODE VARCHAR2 6 DEMAND CODE is a code used to classify the demand.
VULNERABILITY_CODE VULN_CODE VARCHAR2 6 VULNERABILITY CODE is a code used to identify the vulnerability.
CLASSIFICATION_CODE CLASS_CODE VARCHAR2 32 CLASSIFICATION CODE is the aquifer classification system has two components: 1) a classification component to categorize aquifers based on their current level of development, (use) and vulnerability to contamination, and 2) a ranking component to indicate the relative importance of an aquifer. The classification component categorizes aquifers according to level of development and vulnerability to contamination: Level of Development and Vulnerability subclasses are designated. The composite of these two subclasses is the Aquifer Class (Table 1). Development subclass: The level of development of an aquifer is determined by assessing demand verses the aquifer's yield or productivity. A high (I), moderate (II), or low (III) level of development can be designated. Vulnerability subclass: The vulnerability of an aquifer to contamination from surface sources is assessed based on: type, thickness and extent of geologic materials overlying the aquifer, depth to water (or top of confined aquifers), and the type of aquifer materials. A high (A),moderate (B), or low (C) vulnerability can be designated. Aquifer Class: The combination of the three development and three vulnerability subclasses results in nine aquifer classes (Table 1). For example, a class IA aquifer would be heavily developed with high vulnerability to contamination, while a IIIC would be lightly developed with low vulnerability.
GEOMETRY GEOMETRY SDO_GEOMETRY 64 GEOMETRY is a ArcSDE spatial column.
FEATURE_AREA_SQM NUMBER 19
FEATURE_LENGTH_M NUMBER 19
OBJECTID OBJECTID NUMBER 38 OBJECTID is a required attribute of feature classes and object classes in a GeoDatabase. This attribute is added to a SDE layer that was not previously created as part of a GeoDatabase but is now being registered with a GeoDatabase.
SE_ANNO_CAD_DATA BLOB 4000

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