Abstract
The development of a device for measuring raindrop impact force is described. The apparatus records the amplitude of voltage outputs produced by water-drops striking the surface of a piezo-electric transducer. Voltage output can be calibrated in terms of kinetic energy or impact force. The apparatus can record either the force of individual water-drop impacts or the integrated impact force exceeding a particular threshold value. Impact force and transducer output signal are linearly related to each other. The effect of the height of fall on impact force is discussed. Transducer measurements are compared with amounts of sand splashed by faling water-drops. The similarity of the results suggests that the apparatus is recording an important erosive property of the water-drops used in the experiments.
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