INVESTIGATION OF SIMULATION REQUIREMENTS FOR THE RAIN ENVIRONMENT.
Rept. no. 1,
FRANKFORD ARSENAL PHILADELPHIA PA
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The report describes investigative research on characteristics of natural rainfall for development of criteria for its simulation in environmental laboratories. An optimum set of rain simulation characteristics was determined that would adequately meet the most common natural rainfall requirements. In nature, distributive rainfall patterns are extremely sensitive to wind. Rainfall samples of nearly equal intensity display wide differences in distribution. Size and velocity of raindrops are more important than the number of raindrops impinging on a surface in a given unit of time and the number of raindrops has no correlation with rainfall intensity. The energy of impingement and ability of raindrops to penetrate are related directly to wind velocities above 20 mph. Author