Report of Committee on Evaporation And Transpiration, 1947–1948

For this report it was suggested that, if the committee members did not have current research progress to report, they might contribute their comments on the following topic: Gains in water content of soil or snow during rainless periods. The results are presented below. In some localities where fogs are prevalent, drip from the trees may be an important source of water for the soil when no precipitation is recorded in rain gage in a standard exposure. An outstanding example comes from the Cascade Head Field Station of the Pacific Northwest Forest Experiment Station, which is located close to the Oregon coast. During an aggregate of 142 foggy days, when the precipitation recorded in a, standard gage amounted to 25.19 inches, the average of the catch in three gages under a dense stand of sitka spruce and western hemlock 150 ft high, amounted to 35.42 inches. The excess of 11.23 inches, or 0.08 inch per day, resulted from fog drip from the trees.

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