Half‐flow dates, defined as the dates on which half of the year's total stream‐flow has passed, appear to be useful measures of streamflow ‘timing.’ For studying possible changes in streamflow regime caused by watershed management practices, especially vegetational manipulation aimed at increasing snowpack and delaying snowmelt, half‐flow dates seem to be more suitable than the date of momentary maximum flow. They are more sensitive to change in regime than another criterion in general use, the percentage of flow occurring during one or more fixed months.
The rate of heat removal from the human body by wind and low temperature was termed Wind Chill by Siple and expressed by an empirical formula. This paper discusses the formula critically, pointing out that this measure of the convective heat loss may be less than three-quarters of the total heat lost by the body. Siple's formula is compared with those of others, and the use of the formula is discussed.
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