Parent Layer: Structural Contours and Isopachs

Name: Lower_Arapahoe_Aquifer_Formation_thickness_Denver_Basin_USGS

Display Field: Feet

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This line dataset (PP1770_ thickness_sand_LKA_con.shp) consists of contours of equal silt-plus-sand thickness, in feet, for the lower Arapahoe aquifer (model layer 10) of the Denver Basin aquifer system, Colorado. A point dataset was generated in ArcGIS 9.2 (Environmental Systems Research Institute, Inc., 1999-2004) from the CDWR Denver Basin geophysical log database (Brian Ahrens, Colorado Division of Water Resources, written commun., 2003), and the point data were contoured using an either an ordinary kriging method or an inverse-distance weighted method available in ArcGIS, depending on which method resulted in the least error. Percent-sand values were derived by dividing the silt-plus-sand thickness values from total aquifer thickness, and the percent-sand values were subsequently used as multiplier arrange for hydraulic conductivity and specific-yield values in a in a three-dimensional groundwater-flow model of the Denver Basin (Paschke, 2011). See the "Supplemental Information" section of this metadata for more detailed descriptions of the datasets, their application, and references.

Service Item Id: 62e71c600e9a47bc9df916aced58d0fc

Copyright Text:

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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YMin: 4689308.425843834
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YMax: 4888137.543744694
Spatial Reference: 102100  (3857)

Drawing Info:

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Type ID Field: null

Fields:

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• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Feet ( type: esriFieldTypeDouble, alias: Feet )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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