Hayes F. Grubb Harold H. Zehner 1973 <p>Aquifer diffusivity<i> (T/S)</i> was calculated for 10 sites in the&nbsp;alluvial aquifer adjacent to the Ohio River by observing the response of&nbsp;the aquifer to a flood wave in the river. The calculated type curves&nbsp;matched the observed aquifer response reasonably well at eight of the&nbsp;10 sites. The diffusivities ranged from 0.4 ft² sec^_-1 to 10.3 ft² sec^-1&nbsp;and were generally in agreement with diffusivity values calculated from&nbsp;pump-test methods at two of the sites. Interference from pumping 1/2&nbsp;mile upstream from one site and localized aquifer inhomogeneity at&nbsp;another site precluded calculation of diffusivity. Determining the shape&nbsp;of the ground-water recession curve may be difficult, but it can be done satisfactorily by collecting water-level data during an extended period&nbsp;of ground-water discharge and transposing the average recession curve&nbsp;to the flood period being analyzed. The flood-wave response method&nbsp;for estimating aquifer diffusivity provides a relatively inexpensive<br />technique for obtaining a significant part of the data needed to predict&nbsp;the aquifer's response to river and pumping stresses.</p> application/pdf en U.S. Geological Survey Aquifer diffusivity of the Ohio River alluvial aquifer by the flood-wave response method article