Precipitation-Frequency Atlas of the Western United States. Volume 9. Washington
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Precipitation-Frequency Atlas of the Western United States. Volume 9. Washington

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    Each volume of this Atlas_ contains precipitation-frequency maps for 6- and 24-hr durations for return periods from 2 to 100 y1 s for one of the 11 western states ( west of about 103 ° W.). Also included arc methods and nomograms for estimating values for durations other than 6 and 24 hrs. This new series of maps differs from previous publications through greater attention to the relation between topography and precipitation-frequency values. This relation is studied objectively through the use of multiple regression screening techniques which develop equations used to assist in interpolating values between stations in regions of sparse data. The maps were drawn on a scale of I: 1,000,000 and reduced to 1 :2,000,000 for publication.

    In addition to the maps, each volume includes a historical review of precipitation-frequency studies, a discussion of the data handling and analysis methods, a section on the use and interpretation of the maps, and a section outlining information pertinent to the precipitation-frequency regime in the individual state. This state section includes a discussion of the importance of snow in the precipitation-frequency analysis and formulas and nomograms for obtaining values for 1-, 2-, 3-, and 12-hr durations.

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