Q

4-rcT

where swp is the drawdown at the well. The values of sp as a function of H/rw for various values of Le/H can be obtained from Figure 9.9.6, which was developed by Sternberg (1967).

The performance of an imperfect well related to a perfect well is expressed as an efficiency, defined as the ratio of Qp to Q at a given drawdown as or

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