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. ©1946. American Geophysical Union. All Rights Reserved.
Cooper, H. H., & Jacob, C. E. (1946). A generalized graphical method for evaluating formation constants and summarizing well‐field history. Eos, Transactions American Geophysical Union, 27(4), 526–534. https://doi.org/10.1029/TR027i004p00526