In the northern Rocky Mountains, in Idaho, data collected during three winters demonstrate why there is always less snow beneath the canopy of a cedar-hemlock forest than in the adjacent small openings. The author presents as evidence the differential release of water, which originates in the canopy as throughfall-drip, thus accounting for part of the deficiency in snow water equivalent beneath the canopy by April 1. Such informative data were made possible by a new instrument designed to collect waterflow from the snowpack.
Haupt, Harold F. 1972. The release of water from forest snowpacks during winter. Res. Pap. INT-RP-114. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 17 p.