Aquifer Test Procedures for Determining Hydrologic Properties
AquiferAquifer TestTest ProceduresProcedures forfor DeterminingDetermining HydrologicHydrologic PropertiesProperties Dr. Michael Strobel Deputy State Director EXHIBIT G– WATER RESOURCES Meeting Date: 03-22-06 USGS Nevada Water Science Center Document consists of 28 slides. Entire Exhibit Provided Purposes of Aquifer Tests • Measure the change, with time, in water levels as a result of withdrawals through wells • Determine the transmissivity and storage coefficient of the aquifer • Determine characteristics of confining layers • Determine well efficiency and optimum pumping rates • Determine boundary conditions (natural) and potential well interference Types of Aquifer Tests •Slug • Single-well • Multiple-wells – Time-Drawdown Analysis – Distance-Drawdown Analysis From Alley, W.M., Reilly, T.E., and Franke, O.L., 1999, Sustainability of ground- water resources: U.S. Geological Survey Circular 1186, 79 p. From Alley, W.M., Reilly, T.E., and Franke, O.L., 1999, Sustainability of ground- water resources: U.S. Geological Survey Circular 1186, 79 p. From Alley, W.M., Reilly, T.E., and Franke, O.L., 1999, Sustainability of ground- water resources: U.S. Geological Survey Circular 1186, 79 p. From Alley, W.M., Reilly, T.E., and Franke, O.L., 1999, Sustainability of ground- water resources: U.S. Geological Survey Circular 1186, 79 p. Slug Test TIME • The rapid addition or removal of a known volume from a well stresses the aquifer. • The hydraulic conductivity (K) estimate is related to the rate of recovery with various corrections for well construction
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