Water-level recovery tests were made on 172 wells in the Salt River Valley. The test data were analyzed to determine transmissivity and specific capacity. For ideal conditions water-level recovery data plot on a semilogarithmic straight line. Some of the data collected departed from a semilogarithmic straight line owing to both formation and wellbore factors. Areal distribution of the resulting transmissivity values shows high transmissivity in the upper alluvium near the Salt River and in wells that penetrate buried deposits of the ancestral Salt River. Specific capacity data show a similar distribution, but well construction and development methods also influence individual specific capacities. A relation between transmissivity and specific capacity was determined using linear regression techniques.
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