It is difficult to put into a single phrase the idea that by means of pumping test a great deal may be learned about an aquifer, a water-bearing formation from which ground water may be obtained through wells. The name applied to this type of quantitative method is aquifer performance test--or simply aquifer test. This distinguishes the aquifer test from a simple puming test. The latter provides nothing more than the water levels in the well at each of several production rates, to aid in selecting a pump which will perform satisfactorily in the particular well. In many parts of the Rio Grande Va11ey, for example, the simple pumping test meets the needsofdriller and owner, and probably neither would consider the prolonged pumping generally required in the aquiger test to be economical.
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