BETCO is a Windows-executable program that removes fluctuations due to barometric pressure and Earth tides in aquifer water-level measurements. BETCO adjusts water-level measurements using barometric and Earth-tide measurements collected at equal intervals by applying a multiple regression (deconvolution) technique.
A Computer Note that describes the regression deconvolution procedure is available at:
- Toll NJ, Rasmussen TC, 2007, "Removal of barometric pressure effects and Earth tides from
observed water levels", Ground Water 45(1):101-105. (download)
Additional articles using this method can be found at:
- Rasmussen TC, TL Mote, 2007, "Monitoring surface and subsurface water storage using
confined aquifer water levels at the Savannah River Site, USA", Vadose Zone Journal 6:327-335. (download)
- Herkelrath WN, YK Kharaka, JJ Thordsen, MM Abbottt, 2007, "Hydrology and subsurface transport of oil-field brine at the US Geological Survey OSPER site A, Osage County, Oklahoma", Applied Geochemistry 22(10):2155-2163.
- Stejskal V, L Skalsky, L Kasparek, 2007, "Results of two-years' seismo-hydrological monitoring in the area of the Hronov-Porici Fault Zone, Western Sudetes", ACTA Geodynamica et Geomateriala 4(4):59-76.
- Halford KJ, 2006, "Documentation of a spreadsheet for time-series analysis and drawdown estimation", USGS Scientific Investigations Report 2006-5024. (download)
- Spane FA, 2002, "Considering barometric pressure in groundwater flow investigations", Water Resources Research 38(6):1078
- Desbarats AJ, DR Boyle, M Stapinsky, MJL Robin, 1999, "A dual-porosity model for water level response to atmospheric loading in wells tapping fractured rock aquifers", Water Resources Research 35(5):1495-1505.
- Rasmussen TC, LA Crawford, 1997, "Identifying and removing barometric pressure
effects in confined and unconfined aquifers", Ground Water, 35(3):502-511. (download)
BETCO 1.0 (download), along with the User's Manual (download), are available as free downloads. BETCO was developed by Nathaniel Toll (firstname.lastname@example.org) and Professor Todd Rasmussen (email@example.com) at the University of Georgia. Nate developed and currently maintains the program.
Input for the utility is either an ASCII comma-separated-value (CSV) table or Excel spreadsheet of observed water levels, barometric pressures, and synthetic Earth tides in consistent units (either head or pressure) and the measurement time. The output is a matrix of adjusted water-level measurements versus time in either Excel or CSV format.
Synthetic Earth tide gravity can be generated using a variety of free codes available on the internet. We have found TSOFT, developed at the Royal Observatory of Belgium, to be the easiest to use.
Your feedback is valued, so please let us know about possible improvements.