Which term describes a test that provides information about the transmissibility and storage coefficient (available volume of water) of an aquifer?

• A. Drawdown
• B. Pump Test
• C. Aquifer Performance Analysis
• D. Hydraulic Conductivity Test

Answer: (C)

The test concept here is using pumping data to uncover how an aquifer behaves in terms of water movement and storage. When you pump at a controlled rate and watch how the water level declines in the pumped well and nearby observation wells, you generate information that, through analysis, reveals the aquifer’s transmissibility and storage coefficient. The term that best captures this whole process—the measurement plus the interpretation to determine those hydraulic properties—is Aquifer Performance Analysis. It emphasizes evaluating how the aquifer performs under pumping to yield parameters like transmissibility (how easily water moves through the aquifer) and storativity or storage coefficient (how much water is released per unit decline in head).

Drawdown describes the actual drop in water level, but by itself it isn’t the test or the analytic process that gives T and S. A pump test is the procedure, yet the specific assessment that translates the observed data into transmissibility and storage values is the aquifer performance analysis. A hydraulic conductivity test focuses on K, a property of the material, and doesn’t directly provide the combined information about transmissibility and storage that pumping-test analysis yields.