Name: Primary Aquifers by Section

Display Field: aquifer_group

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: County Well Index (CWI) location-verified and interpreted well records were summarized by PLS section. Results show the general distribution of aquifer use in the state. Classification is based on the aquifer code with the greatest frequency in each section; in cases where multiple aquifer codes have the same count, classification between those codes is arbitrary: • Surficial sand and gravel – aquifer close to the land surface. Like a sandbox, vulnerable to contamination due to lack of overlying fine-grained material; recharges quickly • Buried sand and gravel – aquifer not close to the land surface, less vulnerable to contamination due to presence of overlying – fine-grained material; recharges slowly • Sandstone bedrock – aquifer typically not close to the land surface, contamination vulnerability depends on composition and thickness of overlying material • Carbonate bedrock (limestone) – aquifer often close to the land surface, contamination vulnerability depends on composition and thickness overlying material. Because carbonate bedrock dissolves over time, water can move quickly over long distances through conduits and caves and is highly vulnerable to contamination in near-surface conditions. o see areas mapped as karst on GRAPS Pollution Sensitivity of Near-Surface Materials • Crystalline bedrock – aquifer often close to the land surface, contamination vulnerability depends on overlying material. The rock itself is relatively impermeable, so water moves through fractures only; wells can have low yields and be vulnerable to contamination. o See areas in northeastern and southwestern Minnesota mapped as bedrock at or near surface on GRAPS Pollution Sensitivity of Near-Surface Materials • Weathered material – aquifer typically not close the land surface, less vulnerable to contamination due to presence of overlying fine-grained material. Water quality can be highly mineralized; used as an aquifer because of no overlying sand and gravel; recharges slowly Data source: Not available for download

Copyright Text: Minnesota Department of Health (MDH)

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Spatial Reference: 26915  (26915)  VCSWkid(5703)  LatestVCSWkid(5703)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: aquifer_group
Field 2: N/A
Field 3: N/A
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UniqueValueInfos:
• Value: Surficial sand and gravel
  Label: Surficial sand and gravel
  Description: N/A
  Symbol:
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  Color: [255, 255, 115, 153]
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• Value: Buried sand and gravel
  Label: Buried sand and gravel
  Description: N/A
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  Color: [196, 15, 61, 153]
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• Value: Unspecified sand and gravel
  Label: Unspecified sand and gravel
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 150, 4, 153]
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• Value: Sandstone bedrock
  Label: Sandstone bedrock
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [0, 148, 68, 153]
  Outline:
  N/A
• Value: Carbonate bedrock (limestone)
  Label: Carbonate bedrock (limestone)
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [0, 125, 175, 153]
  Outline:
  N/A
• Value: Crystalline bedrock
  Label: Crystalline bedrock
  Description: N/A
  Symbol:
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  Color: [122, 42, 144, 153]
  Outline:
  N/A
• Value: Weathered material
  Label: Weathered material
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  Color: [128, 130, 133, 153]
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Type ID Field: null

Fields:

• objectid ( type: esriFieldTypeOID, alias: objectid )
• aquifer_group ( type: esriFieldTypeString, alias: Primary Aquifer by Section, length: 100 )
• shape ( type: esriFieldTypeGeometry, alias: shape )

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