ABSTRACT:Data from 100 stations were used to prepare a generalized characterization of the extremely long dry day sequences in the United States. Maps are presented showing the magnitude of the two‐year, dry day sequences for 1 mm threshold and the coefficient of variation of the items used in the extreme value analysis. For the United States, the average coefficient of variation for dry periods is 30 percent as compared with that for maximum 24h rainfalls which is 37 percent. An example is presented for computing the longer return period
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