Abstract
In connection with a study of forest-fire hazard being conducted at the Petawawa Forest Experiment Station of the Dominion Forest Service, Department of the Interior, Canada, at Chalk River, Ontario, an investigation was made, during the 1933 fire season, of the proportion of the rainfall recorded in the open which reaches the forest floor under stands with nearly full canopy. Measurements of rainfall in the open were made at the meteorological observation station operated at the Petawawa Forest Experiment Station. A non-recording gauge of conventional pattern was used for comparison with similar gauges in the forest. The rims of all gauges were about six inches above the ground. Readings were made twice daily in the open, and once a day in the forest. A softwood stand typical of the region was selected about one mile east of the point where the meteorological equipment was located. This was of mixed white and red pine (P. strobus, P. resinosa), 40 years old, with a crown density of 96 per cent as determined by the Clement's photometer. Within an area of 100 square yards in this forest, five rain gauges were disposed as follows:
Published Version
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