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4. A pumping test is conducted on a production well located in an extensive, isotropic, homogeneous, 25- m thick, totally confined, sand and gravel aquifer. The production well has a 15 m screened interval. The well is pumped at a constant rate of 1,200 m3/d for 240 minutes. Time-drawdown data are collected at three observation wells located 61 m, 122 m, and 244 m from the pumping well as shown in the image below. Production Well Observation Wells 61 m Static-815 m 122 m 244 m Sand and Gravel Impermeable Confining Unit 25 m Impermeable Confining Unit NOT TO SCALE Datum 0m a. Prepare log-log pots of the time-drawdown data for each of the observation wells. Using manual curve matching, determine values of transmissivity and storativity for each data set. T = W(u) 4πs S= u4Tt b. Compare and contrast the values computed. Should they all be the same? If not, how would you present the results to the well owner? c. Analysis of pumping a confined aquifer can also be accomplished using the Cooper-Jacob straight line method. Plot the time-drawdown data for the observation well located at 122 m from the pumping well as a semi-log plot and determine T and S. Compare these results to the results from the part (a) type curve analyses, and comment on their similarity or differences. 2.3Q T = 4TAS S= 2.3Qto 1.778A2

4. A pumping test is conducted on a production well located in an extensive, isotropic, homogeneous, 25- m thick, totally confined, sand and gravel aquifer. The production well has a 15 m screened interval. The well is pumped at a constant rate of 1,200 m3/d for 240 minutes. Time-drawdown data are collected at three observation wells located 61 m, 122 m, and 244 m from the pumping well as shown in the image below. Production Well Observation Wells 61 m Static-815 m 122 m 244 m Sand and Gravel Impermeable Confining Unit 25 m Impermeable Confining Unit NOT TO SCALE Datum 0m a. Prepare log-log pots of the time-drawdown data for each of the observation wells. Using manual curve matching, determine values of transmissivity and storativity for each data set. T = W(u) 4πs S= u4Tt b. Compare and contrast the values computed. Should they all be the same? If not, how would you present the results to the well owner? c. Analysis of pumping a confined aquifer can also be accomplished using the Cooper-Jacob straight line method. Plot the time-drawdown data for the observation well located at 122 m from the pumping well as a semi-log plot and determine T and S. Compare these results to the results from the part (a) type curve analyses, and comment on their similarity or differences. 2.3Q T = 4TAS S= 2.3Qto 1.778A2

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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4. A pumping test is conducted on a production well located in an extensive, isotropic, homogeneous, 25- m thick, totally confined, sand and gravel aquifer. The production well has a 15 m screened interval. The well is pumped at a constant rate of 1,200 m3/d for 240 minutes. Time-drawdown data are collected at three observation wells located 61 m, 122 m, and 244 m from the pumping well as shown in the image below. Production Well Observation Wells 61 m Static-815 m 122 m 244 m Sand and Gravel Impermeable Confining Unit 25 m Impermeable Confining Unit NOT TO SCALE Datum 0m a. Prepare log-log pots of the time-drawdown data for each of the observation wells. Using manual curve matching, determine values of transmissivity and storativity for each data set. T = W(u) 4πs S= u4Tt b. Compare and contrast the values computed. Should they all be the same? If not, how would you present the results to the well owner? c. Analysis of pumping a confined aquifer can also be accomplished using the Cooper-Jacob straight line method. Plot the time-drawdown data for the observation well located at 122 m from the pumping well as a semi-log plot and determine T and S. Compare these results to the results from the part (a) type curve analyses, and comment on their similarity or differences. 2.3Q T = 4TAS S= 2.3Qto 1.778A2
Transcribed Image Text:4. A pumping test is conducted on a production well located in an extensive, isotropic, homogeneous, 25- m thick, totally confined, sand and gravel aquifer. The production well has a 15 m screened interval. The well is pumped at a constant rate of 1,200 m3/d for 240 minutes. Time-drawdown data are collected at three observation wells located 61 m, 122 m, and 244 m from the pumping well as shown in the image below. Production Well Observation Wells 61 m Static-815 m 122 m 244 m Sand and Gravel Impermeable Confining Unit 25 m Impermeable Confining Unit NOT TO SCALE Datum 0m a. Prepare log-log pots of the time-drawdown data for each of the observation wells. Using manual curve matching, determine values of transmissivity and storativity for each data set. T = W(u) 4πs S= u4Tt b. Compare and contrast the values computed. Should they all be the same? If not, how would you present the results to the well owner? c. Analysis of pumping a confined aquifer can also be accomplished using the Cooper-Jacob straight line method. Plot the time-drawdown data for the observation well located at 122 m from the pumping well as a semi-log plot and determine T and S. Compare these results to the results from the part (a) type curve analyses, and comment on their similarity or differences. 2.3Q T = 4TAS S= 2.3Qto 1.778A2
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