Tamarack Modeling Project Documentation

• Description: Tamarack Modeling Project Documentation - DRAFT
• State: CO
• State: NE
• Basin: South Platte
• Water Division: 1
• Title: Tamarack Modeling Project Documentation - DRAFT
• Water Supply Pro - Doc Type: Report/Study

2.0 GENERAL SITE CHARACTERISTICS
As part of model development, 149 groundwater wells were identified, 88 well logs were
reviewed and 10 cross - sections were constructed. Based on the analysis of this data the
following general interpretations were made for the Tamarack modeling area:
• An old river channel is evident on the west site of the model area. This channel is
located south of the current South Platte River below the Sand Hills. At the east
end of the study area this old river channel aligns with the current South Platte
River. Figure 2.1 provides simplified cross - sections highlighting the basic
channel configuration.
• The alluvial aquifer can be divided into two layers; 1) the top layer consisting
primarily of sands; and 2) the lower layer consisting primarily of gravels. The
base of the aquifer is easily identified either as clay, brule or shale on the geologic
logs.
Figure 2.1- Schematic Cross - Sections of Tamarack SWA
Based on these general site characteristics the model area was divided into three
hydrogeologic zones as shown on Figure 2.2:
River Floodplain — Area near the current South Platte River. Typically the depth to
water in this area is less than 3 meters (10 feet).
Paleo - Channel - An old river channel is evident from the geologic logs. This channel is
located south of the current South Platte River below the Sand Hills. At the east end of
the study area this old river channel aligns with the current Platte River. Figure 2.1
provides simplified cross - sections highlighting the basic channel configuration.
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