Abstract
An analysis of measurements of rainfall made during 1957 in a small drainage basin on the leeward slope of the Koolau Range of Oahu shows that the rainfall at each gage correlates according to a geometric progression with the distance of the gage from the summit. The rainfall increases sharply in a leeward direction from the summit to a point about 2500 feet away; thereafter it decreases at a rate more gradual than that of the initial increase. Variation in orographic rainfall with distance from the crest of the range is responsible for the pattern of distribution of rainfall on the leeward slope. Rainfall from cyclonic storms has little effect on the pattern because of its generally uniform distribution. Gages in the bottom of the drainage basin consistently catch more rainfall than gages on the adjacent ridge.
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