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The time when water soaked into the ground can be inferred for each sample from the variation of dissolved-gas content, and the effective velocity of ground water can be calculated thereby. The effective velocity observed in an aquifer consisting of coarse gravel ranges from 3.6 to 10 meters per day, corresponding to different hydraulic gradients. If these values are converted by Darcy9s formula into the velocity along a one percent hydraulic gradient, they range from 36 to 58 meters per day.
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Ryuichi Sugisaki (1961) studied this question.
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