THE Palouse Rainfall Simulator was designed to simulate storms of the Pacific Northwest. Such storms are characterized by their low intensities, long durations, and small drop sizes. A drop size distribution similar to that of storms with rainfall intensities of 2.5 to 10 mm/h was achieved by nozzle selection. Rainfall intensities of 6 to 46 mm/h were obtained by use of slotted rotating disks. The rotating disks had no significant effect on the drop size distribution. Application uniformity was slightly lower at the lowest intensity tested..
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Bubenzer et al. (1985) studied this question.