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step-drawdown A test was performed on the MX W ber 1980. The radius of the well casing is 5 inches, and 7 inches. The well was drilled to a total depth of 700 f ed from 559 to 679 feet below land surface. Static wate and surface. Each pumping step ran for 3 hours, and th step are given in the table below.

step-drawdown A test was performed on the MX W ber 1980. The radius of the well casing is 5 inches, and 7 inches. The well was drilled to a total depth of 700 f ed from 559 to 679 feet below land surface. Static wate and surface. Each pumping step ran for 3 hours, and th step are given in the table below.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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**Step-drawdown Test on MX Well** A step-drawdown test was conducted 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 the land surface and is screened from 559 to 679 feet below the land surface. The static water level in the well is 231.36 feet below the land surface. Each pumping step lasted for 3 hours, with times and observed drawdowns shown in the table below. | **Time of Operation** | **Pumping Rate (gpm)** | **Depth to Water at End of Cycle (feet)** | |-----------------------|------------------------|------------------------------------------| | 10:00 am – 1:00 pm | 210 | 235.62 | | 1:00 pm – 4:00 pm | 392 | 239.39 | | 4:00 pm – 7:00 pm | 550 | 242.75 | | 7:00 pm – 10:00 pm | 583 | 243.46 | **Tasks:** 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:**Step-drawdown Test on MX Well** A step-drawdown test was conducted 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 the land surface and is screened from 559 to 679 feet below the land surface. The static water level in the well is 231.36 feet below the land surface. Each pumping step lasted for 3 hours, with times and observed drawdowns shown in the table below. | **Time of Operation** | **Pumping Rate (gpm)** | **Depth to Water at End of Cycle (feet)** | |-----------------------|------------------------|------------------------------------------| | 10:00 am – 1:00 pm | 210 | 235.62 | | 1:00 pm – 4:00 pm | 392 | 239.39 | | 4:00 pm – 7:00 pm | 550 | 242.75 | | 7:00 pm – 10:00 pm | 583 | 243.46 | **Tasks:** 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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