Determination of Barometric Efficiency and Effective Porosity, Boreholes UE-25 c No. 1, UE-25 c No. 2, and UE-25 c No. 3, Yucca Mountain, Nye County, Nevada

摘要

Simultaneous records of water-level altitudes in boreholes UE-25 c no. 1, UE-25 c no. 2, and UE-25 c no. 3 (the C-holes) and atmospheric pressure at and near the C-holes were obtained from July 15 to September 8, 1993, to determine the barometric efficiency of the entire uncased section of each of the C-holes, for the purpose of analyzing pumping tests. Water-level altitudes in the C-holes fluctuate in response to Earth tides and changes in atmospheric pressure, which are characteristics of wells completed in an elastic, confined aquifer. The barometric efficiency of the C-holes in this study was analyzed by filtering simultaneously collected water-level-altitude and atmospheric-pressure data to remove the influences of Earth tides and semi-diurnal heating and cooling and then regressing filtered water-level-altitude changes as a function of filtered changes in atmospheric pressure.