ABSTRACTA 72‐hour aquifer test was conducted at the Sweet‐water Recharge site in Tucson, Arizona for the purpose of estimating aquifer parameters using the graphical curve‐matching technique of Neuman (1974). These parameter estimates will be used to estimate the movement of ground water under seasonal recharge and recovery operations at the site. The lithology of the saturated sediments at the site appears to be relatively uniform and homogeneous from the water table at about 100 feet below land surface to about 600 feet below land surface. The aquifer base is a finegrained unit which extends from 600 feet to an unknown depth below the site. Poorly sorted sandy gravels and gravelly sands are predominant above 600 feet. A well was pumped at an average rate of 2,020 gallons per minute for 72 hours. Drawdown and recovery measurements of water levels were made in five shallow monitoring wells and one deep monitoring well.The log‐log drawdown versus time plots indicated delayed gravity response. The method of Neuman (1974) was used to estimate aquifer parameters from the test results. Because the pumped and monitoring wells were characterized by varying degrees of partial penetration, the computer program code developed by Neuman (1974) called DELAY2 was used to generate type curves for the unique arrangement of wells at t