Abstract
Modification of viscous drag and the pressure drag terms in Rubey's theoretic equation for settling velocity of sand grains with two empirically determined constants results in the following formula urn:x-wiley:00431397:media:wrcr583:wrcr583-math-0001 which predicts accurately the setting velocity of groups of sand grains measured with the Woods Hole rapid sediment analyzer. The following equation is a solution of Rubey's modified general equation that can be used to calculate the diameter of a particle or group of particles if the settling velocity for the particle is known: urn:x-wiley:00431397:media:wrcr583:wrcr583-math-0002

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