DRASTIC Aquifer Intrinsic Vulnerability
519 views (4 recent)Published by the Ministry of Environment and Climate Change Strategy - Water Protection and Sustainability
Licensed under Open Government Licence - British Columbia
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Spatial layer intended to describe the intrinsic vulnerability of the groundwater.
|Name||Mike Wei (businessExpert)|
|Organization||Ministry of Environment and Climate Change Strategy|
|Sub-Organization||Water Protection and Sustainability|
Access & Security
|Who can view this dataset?||Public|
|Who can download this dataset?||Public|
|Record Last Modified||2019-09-05|
Object Name: WHSE_WATER_MANAGEMENT.GW_AQUIFER_VULNERABILITY_POLY
Short Name: GWQFRVLNRB
Comments: Aquifer vulnerability is a spatial layer that describes the intrinsic vulnerability of the groundwater. Intrinsic vulnerability means that it is based on hydrogeologic characteristics alone and does not consider the existing type of land use or nature of the potential contaminants. In assessing an aquifer's vulnerability, the contaminant is assumed to be introduced at, or very near, the land surface. The methods used to describe vulnerability include: DRASTIC and Aquifer Vulnerability Index (AVI). This spatial layer has polygonal features.
|Column Name||Short Name||Data Type||Data Precision||Comments|
|AQUIFER_VULNERABILITY_ID||AV_ID||NUMBER||10||AQUIFER VULNERABILITY ID is a sequential business key maintained by the system starting at 1.|
|VULNERABILITY_VALUE||VLNR_VALUE||NUMBER||4||The VULNERABILITY VALUE is a calculated number based on the DRASTIC methodology used to assess groundwater pollution potential. Vulnerability values range between 23 and 230.|
|VULNERABILITY_CLASS||VLNR_CLASS||VARCHAR2||12||The VULNERABILITY CLASS is a categorization of the VULNERABILITY VALUE and includes three classes - Low, Moderate and High. For example, the low category includes Vulnerability Values from 23 to 100.|
|FEATURE_CODE||F_CODE||VARCHAR2||10||FEATURE CODE contains a value based on the Canadian Council of Surveys and Mapping's (CCSM) system for classification of geographic features.|
|GEOMETRY||GEOMETRY||SDO_GEOMETRY||1||GEOMETRY is the column used to reference the spatial coordinates defining the feature.|
|OBJECTID||OBJECTID||NUMBER||38||OBJECTID is a required attribute of feature classes and object classes in a geodatabase.|
|SE_ANNO_CAD_DATA||BLOB||4000||SE_ANNO_CAD_DATA is a binary column used by spatial tools to store annotation, curve features and CAD data when using the SDO_GEOMETRY storage data type.|
|FEATURE_AREA_SQM||FEAT_AREA||NUMBER||19||FEATURE_AREA_SQM is the system calculated area of a two-dimensional polygon in square meters|
|FEATURE_LENGTH_M||FEAT_LEN||NUMBER||19||FEATURE_LENGTH_M is the system calculated length or perimeter of a geometry in meters|