The time–drawdown data for an observation well located 300 ft from a pumped artesian well (500 gpm) are given in the following table. Find the coefficient of storage (ft3 of water/ft3 of aquifer) and the transmissivity (gpd/ft) of the aquifer by the Theis method. Use 3 × 3–cycle log paper.
Time (hr) | Drawdown (ft) |
1.8 | 0.27 |
2.1 | 0.30 |
2.4 | 0.37 |
3.0 | 0.42 |
3.7 | 0.50 |
4.9 | 0.61 |
7.5 | 0.84 |
9.8 | 1.09 |
12.2 | 1.25 |
14.7 | 1.40 |
16.3 | 1.50 |
18.4 | 1.60 |
21.0 | 1.70 |
24.4 | 1.80 |
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