Report and analysis of the BULLION forced-gradient experiment Page: 77 of 190
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Report and Analysis of the BULLION Forced-Gradient Experiment
upward trend. The long-term behavior of Well #3 indicates that the
drawdown response of this well was significantly affected by wellbore
conditions, and it was decided that there was little value in analysis of
the response beyond the first few hours. The effects of pumping in
Wells #1 and #2 cannot be distinguished in the Well #3 response.
The drawdown response of individual observation wells to pumping in
another well was analyzed using the Theis equation for a confined
aquifer and also using a dual-porosity model for fractured formations.
These analyses were done using the commercial software package
AQTESOLV (Geraghty and Miller, Inc., 1991). Only the data from the
first 8 to 10 hours were used in the analyses. These early data were the
least subject to outside effects such as pump shut downs and boundary
conditions. Table 4-1 shows both the parameter values that had
previously been determined for the planning model (BULLION
Forced-Gradient Experiment Implementation Plan [IT, 1997]) and gives
the results of the various analysis methods for the hydraulic responses.
Aquifer thicknesses were estimated from the cross section developed
for the site, shown in Figure 6-1. Leaky confined-aquifer analysis
solutions did not provide any substantial improvement in fitting the
drawdown curves.
Table 4-1
ER-20-6 Hydraulic Parameter Values
Planning Model Experiment Results
well Response Analysis
Record Method Transmissivity Storage Transmissivity Storage
m2/day* Coefficient m2/day* Coefficient
Theis 307 8.0e-4 237 7.6e-4
Observation, Dual 195 8.0e-4 352 3.7e-4
#3 Pumping Porosity
ER-20-6 Theis -3
314 NA
#1 Recovery
Theis -- -- 280 1.5e-3
Observation,
#2 Pumping Dual -- - 236 3.9e-4
Porosity
Theis 187 3.0e-4 148 3.3e-4
ER-20-6 Observation, Dual 218 3.0e-4 218 9.5e-5
#2 #3 Pumping Porosity
Theis 209 NA
Recovery
Theis 47 NA -- --
ER-20-6 #3 Pumping Dual
Porosity 69 NA*m2/day - Squared meters per day
4.0 Analysis of Hydraulic Response
4-3
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Report and analysis of the BULLION forced-gradient experiment, report, August 1, 1998; United States. (https://digital.library.unt.edu/ark:/67531/metadc677665/m1/77/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.