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SOP-012 Standard Operating Procedure <br />Aquifer Testing Page 4 of 18 <br />REVISION NO. 0 <br />March 2020 <br /> <br />Sharpe Army Depot <br /> <br />Slugging Rod - A large metallic or PVC rod (or cylinder) of known volume that is lowered into the well to displace the water during a slug test. Sometimes called a "pig". <br /> <br />Specific Capacity (C) - Discharge per unit of drawdown in a pumping well (Q/s). <br /> <br />Specific Yield (Sy) - The ratio of the volume of water that saturated soil or rock will yield under the influence of gravity, per unit volume of the saturated soil or rock. Specific yield is dimensionless. <br /> <br />Storage Coefficient or Storativity (S) - The volume of water that an aquifer releases from, or takes into storage per unit area of aquifer, per unit change in head. Storage coefficient is dimensionless. <br /> <br />Transmissivity (T) - A quantitative measure of the ability of an aquifer to transmit water. It is the product of the hydraulic conductivity and saturated thickness (K•b). <br /> <br />Unconfined Aquifer - An aquifer in which the water table forms the upper boundary. <br /> <br />Water Level - The position of the air-water interface in a well. The water level is usually measured as the depth to the water from a measuring point (such as the top of the outer protective well casing) by the use of a weighted measuring tape or electric sounder. Changes in the water level over time may also be monitored by a pressure transducer installed at a known depth within the water column inside the well. The water level is called the static water level when it is not influenced by well drilling activities, aquifer testing, well development, or groundwater sampling. <br /> <br />Water Table - The saturated zone surface at which the pore water pressure is equal to atmospheric pressure. The water table is the potentiometric surface for an unconfined aquifer. <br />