A generalized graphical method for evaluating formation constants and summarizing well‐field history

Abstract

The capacities of a water‐bearing formation to transmit water under a hydraulic gradient and to yield water from storage when the water table or artesian pressure declines, are generally expressed, respectively, in terms of a coefficient of transmissibility and a coefficient of storage. Determinations of these two constants are almost always involved in quantitative studies of ground‐water problems.

Basalt features observed in outcrops, cores, borehole video imagery and geophysical logs, and basalt hydrogeologic study at the Idaho National Engineering Laboratory, Eastern Idaho

“…Others have done just that to determine hydraulic conductivity from the impeller flowmeter logs (Rehfeldt, et al, 1989, Moltz, et al, 1989, Boggs, et al, 1990. Most use some sort of transient expression developed by Cooper and Jacob (1946) and modified for the borehole, either the Cooper-Jacob equation or the Cooper-Jacob straight-line equation which is derived from the Cooper-Jacob equation by differentiating with respect to time (i.e. taking the slope of a drawdown vs. log time area).…”

Application of the electromagnetic borehole flowmeter and evaluation of previous pumping tests at Paducah Gaseous Diffusion Plant. Final report, June 15, 1992--August 31, 1992

“…The first is based on the CooperJacob (Cooper and Jacob, 1946) equation relating drawdown to a constant pumping rate in a fully-penetrating well. The second is based on the numerical results of Javandel and Witherspoon (1969).…”

“…In addition, the CooperJacob Straight-Line (CJSL) Equation (Cooper and Jacob, 1946) was applied to the drawdown data.…”

“…confined aquifers, the Jacob (1947) "leaky aquifer" Equation as modified by (Ferris et ai., 1962), and the CooperJacob Straight-Line Equation (Cooper and Jacob, 1946). …”

Assessment of hydrologic and hydrogeologic data at Camp Lejeune Marine Corps Base, North Carolina

“…Several approaches to approximating transmissivity from specific capacity data have been described by Jacob (1945) , Theis and others (1954) , McClymonds and Franke (1972), Bennett (1976), and Driscoll (1986. For the purposes of this report, Jacob's modified nonequilibrium equation (Cooper and Jacob, 1946): (2) is rearranged to obtain an expression for the value of specific capacity:…”