The topographic parameters, elevation, slope, rise, aspect, and zone of influence are correlated with annual precipitation for the San Dimas Experimental Forest in a multiple‐graphical correlation. From this relation it is possible to make an estimate of precipitation at any point in the Forest area with a greater degree of accuracy than when elevation alone is used. The correlation was developed from 11 years of record for 96 gages and a completely independent check was obtained from data for the same period of record for 45 gages which were not used in the graphical development. This study confirms Spreen's investigation for western Colorado and shows the same general technique of graphical correlation of precipitation with topographic parameters is applicable through a wide range of topographical and meteorological conditions.
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