An interpretation of water‐table fluctuations at four wells in Southern California

The urban and agricultural development in most areas of southern California have depended on the underground water‐resources of which more and more use has been made. It has been estimated that in the South Coastal Basin during the summer 90 per cent of the water‐supply for irrigation and other purposes developed locally is obtained from underground sources [see 1 of “References” at end of paper]. Because of the economic importance of this resource, measurements of the depth of water‐level are made regularly at hundreds of wells in the area to obtain knowledge of the draw‐down and replenishment.