Layer: Alluvial Aquifer Extent and Vulnerability (CDPHE) (ID:4)

View In: Map Viewer

Name: Alluvial Aquifer Extent and Vulnerability (CDPHE)

Display Field: NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The Colorado Department of Public Health and Environment (CDPHE) Tracking program collaborated with the Water Quality Control Division (WQCD), OPS and the Colorado Geologic Survey (CGS) to create an atlas of groundwater vulnerability. The Groundwater Vulnerability Tool is comprised of datasets representing potential impacts related to groundwater quality.Estimated groundwater aquifer vulnerability. Based on SWAP program GW_PhysicalSetting_scores. These points were jittered using a random direction and approximately 0.5 mile offset. Jittered points were then run through IDW with a cell size of 6436 meters (~4 miles) and a variable search using 12 points or 6436 meters. IDW output raster was processed using the Math>Int tool to create integer values from random float type. Calculate gridcodes based on weighted scores from oringinal dataset. Some accuracy in vulnerabilty was lost here in rounding. Using the Int output the raster could be transformed to a polygon. The output GW_PhysicalSetting vulnerability IDW output polygon was clipped to the boundaries of the bedrock aquifers. Finally, the clipped IDW output was spatially joined to the original bedrock aquifer file in order to get aquifer designations and ancillary bedrock aquifer info.

Copyright Text: Groundwater Vulnerability Tool built by: Eric Brown Colorado Department of Public Health and Environment Center for Health and Environmental Data Environmental Public Health Tracking Program ericm.brown@state.co.us (303) 692-3630

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

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HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: FID

Unique ID Field:

Global ID Field:

Type ID Field: Vulnerabil

Fields:

FID (type: esriFieldTypeOID, alias: FID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
OBJECTID_1 (type: esriFieldTypeInteger, alias: OBJECTID_1, SQL Type: sqlTypeOther, nullable: true, editable: true)
OBJECTID (type: esriFieldTypeInteger, alias: OBJECTID, SQL Type: sqlTypeOther, nullable: true, editable: true)
Id (type: esriFieldTypeInteger, alias: Id, SQL Type: sqlTypeOther, nullable: true, editable: true)
gridcode (type: esriFieldTypeInteger, alias: gridcode, SQL Type: sqlTypeOther, nullable: true, editable: true)
FID_1 (type: esriFieldTypeInteger, alias: FID_1, SQL Type: sqlTypeOther, nullable: true, editable: true)
AQUIFER_ (type: esriFieldTypeInteger, alias: AQUIFER_, SQL Type: sqlTypeOther, nullable: true, editable: true)
AQUIFER_ID (type: esriFieldTypeInteger, alias: AQUIFER_ID, SQL Type: sqlTypeOther, nullable: true, editable: true)
AREA_ (type: esriFieldTypeDouble, alias: AREA_, SQL Type: sqlTypeOther, nullable: true, editable: true)
NAME_ (type: esriFieldTypeString, alias: NAME_, SQL Type: sqlTypeOther, length: 32, nullable: true, editable: true)
PERIMETER_ (type: esriFieldTypeDouble, alias: PERIMETER_, SQL Type: sqlTypeOther, nullable: true, editable: true)
AREA (type: esriFieldTypeDouble, alias: AREA, SQL Type: sqlTypeOther, nullable: true, editable: true)
PERIMETER (type: esriFieldTypeDouble, alias: PERIMETER, SQL Type: sqlTypeOther, nullable: true, editable: true)
ALLUVIAL_ (type: esriFieldTypeInteger, alias: ALLUVIAL_, SQL Type: sqlTypeOther, nullable: true, editable: true)
ALLUVIAL_I (type: esriFieldTypeInteger, alias: ALLUVIAL_I, SQL Type: sqlTypeOther, nullable: true, editable: true)
NAME (type: esriFieldTypeString, alias: NAME, SQL Type: sqlTypeOther, length: 40, nullable: true, editable: true)
Shape_Leng (type: esriFieldTypeDouble, alias: Shape_Leng, SQL Type: sqlTypeOther, nullable: true, editable: true)
Vulnerabil (type: esriFieldTypeString, alias: Vulnerabil, SQL Type: sqlTypeOther, length: 50, nullable: true, editable: true)
Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)

Types:

Vulnerabil: Low

Vulnerabil: Moderately Low

Vulnerabil: Moderate

Vulnerabil: Moderately High

Vulnerabil: High

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 6/30/2026 3:02:38 PM

Schema Last Edit Date: 6/30/2026 3:02:38 PM

Data Last Edit Date: 6/30/2026 3:02:38 PM

Supported Operations: Query Query Pivot Query Top Features Query Analytic Query Bins Generate Renderer Validate SQL Get Estimates ConvertFormat