Surrounding water level trends and barometric effects may have a significant impact on the water levels recorded during your pumping test. AquiferTest now includes the tools to analyze these affects to determine if they played a role in your pumping test. Using the data pre-processor utilities, you can correct your water level measurements for baseline trends (trend effects) and barometric pressure changes. This corrected drawdown data should then be used for the calculation of the aquifer parameters.
NOTE: Data Pre-Processing tools are available in AquiferTest Pro only.
According to the U.S. EPA-SOP for Pumping Tests (Osborne, 1993), data pre-processing is a critical step in any pumping test analysis:
“Collecting data on pre-test water levels is essential if the analysis of the test data is to be completely successful. The baseline data provides a basis for correcting the test data to account for on-going regional water level changes. Although the wells on-site are the main target for baseline measurements, it is important to measure key wells adjacent to the site and to account for off-site pumping which may affect the test results.” (Osborne, 1993)
"During the baseline trend observation period, it is desirable to monitor and record the barometric pressure to a sensitivity of +/- 0.01 inches of mercury. The monitoring should continue throughout the test and for at least one day to a week after the completion of the recovery measurement period. This data, when combined with the water level trends measured during the baseline period, can be used to correct for the effects of barometric changes that may occur during the test.” (Osborne, 1993)
The following sections are available describing barometric and trend correction functionality in AquiferTest Pro: