MEASUREMENT OF THE SIMULATED RAINFALL AT THE HOLLOMAN TEST TRACK FACILITY.
Final rept. 1 Apr 69-31 Mar 70,
ILLINOIS STATE WATER SURVEY URBANA
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The results of measurements of the simulated rainfall at the Holloman test tract facility are presented. Raindrop spectra measurements were made with a drop camera and with an optical electronic drop spectrometer. A small amount of drop measurements using the flour pellet method were also made for comparison with the other methods. The measurements of the simulated rainfall were compared with average natural rainfall data collected with the drop camera. The average spectra from the track has a liquid water content of 7.96 gm3 and an equivalent rainfall rate of 158.7 mmhr. It does not correspond directly to any natural rainfall area. The natural rain data have been sorted into data from arctic, tropical, and temperate regions, and average raindrop spectra for various frequencies of occurrences calculated. Author