Introduction to Hydrogeology

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  1. A well that is screened in a confined aquifer is to be pumped at a rate of 165,000 ft3
    /day for 30
    days. The aquifer transmissivity is 5320 ft2
    /day, and the storativity is 0.0007. What is the
    drawdown at distances 50, 150, 250, 500, 1000, 3000, 5000, and 10,000 ft? Plot the computed
    distance-drawdown data on a semi-log paper.
  2. A well that is screened in a confined aquifer is to be pumped at a rate of 165,000 ft3
    /day for 30
    days. The aquifer transmissivity is 5320 ft2
    /day, and the storativity is 0.0007. Computer the
    drawdown at a distance of 100 ft at the following times: 1, 2, 5, 10, 15, 30, and 60 minutes; 2,
    5, and 12 hours; and 1, 5, 10, 20, and 30 days. Plot the computed time-drawdown data on a
    semi-log paper.
  3. You are asked to design a pump test for a confined aquifer in which the transmissivity is
    expected to be about 1.4 × 10-2 m2
    /s and the storativity about 1.0 × 10-4
    . What pumping rate
    would you recommend for the test if it is desired that there be an easily measured drawdown of
    at least 1 m during the first 6 hours of the test in an observation well 150 m from the pumping
    well?

Sample Solution

ACED ESSAYS