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When, in hydrologic research, we need to measure the cubic volume of water precipitated on a mountain drainage‐basin, conventional methods of precipitation‐measurement may be open to some question. In ordinary practice, for example, a number of standard rain‐gages may be installed in a watershed with their funnels in the usual horizontal plane. The depths of water caught in these gages may then be associated, by any one of several methods, with the projected (map) area of the watershed in order to calculate the total cubic volume of precipitation which fell on the watershed.

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