WSP08952

• File Number: 8449.870
• Description: SB 996-153 Phase I - Economic Life of the Denver Basin
• State: CO
• Basin: South Platte
• Date: 11/13/1996
• Author: CWCB/SEO
• Title: Economic Life of the Denver Basin Final Report
• Water Supply Pro - Doc Type: Publication

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5.1 Phase 2 Scope of Work NO.1

The Phase 2 Scope of Work NO.1 tasks are attached as Table 1. Figure 1 is a scope of
work task flow chart. The anticipated cost for the work is $30,000. The five Phase 2 tasks for
this scope include:

Task Number

1. Literature Review - Aquifer Layering Effects on Well Production
2. Radial-Flow Correction Analysis
3. Denver Basin Aquifer-Layered Radial Flow Production Analysis
4. Economic Analysis
5. Report

In this Phase 2 work, the results from two production-drawdown analyses will be
compared to determine the most accurate method to determine drawdown at a Denver Basin
aquifer well. Results of a radial-flow correction to estimate groundwater level in a well based on
groundwater level in a model cell performed on output from Banta's model, Task 2 above, will be
compared to drawdown results from a layered-radial flow numerical model, Task 3 above. The
comparison will be performed on wells from the same location in response to identical pumping
stresses. If the pumping stresses at the selected model cells are considered unreasonable,
additional simulations will be performed with more appropriate well production rates. The
pumping water levels from these simulations would then be used as input to the economic
analyses.

It is expected that the layered radial flow model will produce the more accurate results
when compared to the radial flow correction analysis. However, if the radial flow correction
analysis can produce results comparable to the layered analysis, the study will benefit from an
analysis of more aquifers and well locations.

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HRS WATER CONSULTANTS, INC