Abstract
About a year ago, while in the employ of the California State Division of Water‐Resources under the supervision of Harold Conkling, Deputy State Engineer, and George B. Gleason, Senior Hydraulic Engineer, the writer was interested in the problem of underground movement of water from and to the various basins within the South Coastal Basin of southern California. As a method of approach to this problem it was first thought that a reasonable determination of underflow might be obtained by securing an average transmission‐constant for the water‐bearing material for various areas under consideration, by means of a study of capacities of water‐wells and their accompanying drawdowns in offsetting inactive wells—a method previously considered by others. After obtaining the transmission‐constant by this method it was planned to determine the total underflow with the use of the slope of the water‐table, and the cross‐section of the water‐bearing material, both of which were known with reasonable accuracy for a number of areas. In a short time it became evident that, while capacities of a large number of wells were available, figures on simultaneous drawdowns in offsetting idle wells were rare. Also other factors, such as pressure‐conditions in the aquifers, further complicated the problem.
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