a. Estimate the transmissivity of the well, assuming it is a confined aquifer with a storativity between 10-³ and 10-³. b. Calculate the efficiency of the well at 200, 400, and 600 gpm.

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
Chapter1: The Study Of Minerals
Section: Chapter Questions
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7.
A step-drawdown test was performed on the MX Well in southern Spring Valley in
September 1980. The radius of the well casing is 5 inches, and the radius of the well and gravel
pack is 7 inches. The well was drilled to a total depth of 700 feet below land surface, and is
screened from 559 to 679 feet below land surface. Static water level in the well is 231.36 feet
below land surface. Each pumping step ran for 3 hours, and the times and observed drawdowns
for each step are given in the table below.
Time of Operation
10:00 am - 1:00 pm
1:00 pm - 4:00 pm
4:00 pm - 7:00 pm
7:00 pm - 10:00 pm
Pumping Rate Depth to Water
at end of cycle
210 gpm
392 gpm
550 gpm
583 gpm
235.62
239.39
242.75
243.46
a.
Estimate the transmissivity of the well, assuming it is a confined aquifer with a
storativity between 10-5 and 10-³.
b. Calculate the efficiency of the well at 200, 400, and 600 gpm.
Transcribed Image Text:7. A step-drawdown test was performed on the MX Well in southern Spring Valley in September 1980. The radius of the well casing is 5 inches, and the radius of the well and gravel pack is 7 inches. The well was drilled to a total depth of 700 feet below land surface, and is screened from 559 to 679 feet below land surface. Static water level in the well is 231.36 feet below land surface. Each pumping step ran for 3 hours, and the times and observed drawdowns for each step are given in the table below. Time of Operation 10:00 am - 1:00 pm 1:00 pm - 4:00 pm 4:00 pm - 7:00 pm 7:00 pm - 10:00 pm Pumping Rate Depth to Water at end of cycle 210 gpm 392 gpm 550 gpm 583 gpm 235.62 239.39 242.75 243.46 a. Estimate the transmissivity of the well, assuming it is a confined aquifer with a storativity between 10-5 and 10-³. b. Calculate the efficiency of the well at 200, 400, and 600 gpm.
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