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This paper describes a graphical correlation technique for relating mean winter precipitation in western Colorado to the topographic parameters; elevation, maximum slope of the land, exposure, and orientation. This is done by obtaining graphically values of precipitation as a function of elevation for various values of slope. Relating these values with orientation and thence exposure, a set of working charts is obtained. A high degree of correlation is shown to exist between the observed values of precipitation and those estimated from the charts.
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