Use of Type Curves Developed from Electric Analog Studies of Unconfined Flow to Determine the Vertical Permeability of an Aquifer at Piketon, Ohio^a

Abstract

A type‐curve method for determining anisotropy of unconfined aquifers, developed from electric analog simulation, is applied to drawdowns observed near, a well pumping from a glacial outwash aquifer at Piketon, Ohio. The coefficient of vertical permeability, P z'averaged 365 gpd per square foot. Computed drawdown for the pumped well, based on this value, differed by only a small amount from the observed drawdown. The coefficient of storage, determined from type curves for an image well system, averaged 0.20, typical of unconfined aquifers. Application of the method required a thorough knowledge of geohydrologic controls operating at the test site.

Ground-Water Hydraulics

“…I" (0.9) (39. For additional examples of this method and evaluations of results, see Norris and Fidler (1966). ... 1.08........... 1.16........... 1.24........... 1.33........... 1.42........... 1.50........... 1.68.-...--.... 1.85........... 2.…”

Guidelines for characterizing fish habitat in wadeable streams of the Catskill Mountain Region, New York

“…From equation 105, T = (1.0) (1,170 gal min-1 ) (1,440 min day-1 ) For additional examples of this method and evaluations of results, see Norris and Fidler (1966). Table 14 gives the time-drawdown measurements in an observation well 73 ft from a well pumping at constant rate of 1,080 gpm near Fairborn (near Dayton), Ohio, 0.12 .195 .…”

Hydrogeology of the Scioto River Valley near Piketon, south-central Ohio

“…For both sets of samples, transmissibility values computed from laboratory results were far lower than those determined from the aquifer test; the samples from the augered hole showed the greatest disparity. From a study of the logs and laboratory results, the authors concluded that the samples from the drilled well, obtained by bailing, lacked a large fraction of the smaller size particles and that the samples from test hole DW 46, obtained by augering, lacked a large fraction of the larger size particles (Norris and Fidler, 1966a). Part of the difference in field and laboratory permeability values was attributed to the difference in direction of flow with respect to the bedding or to the preferred orientation of the…”

“…When these values were weighted by multiplying them by their respective depth intervals, a value was obtained for the average coefficient of transmissibility which closely approximated the value, about 215,000 gpd per ft, determined from the 9-day aquifer test. The method used in this analysis and the results obtained are described by the authors in a paper published by the U.S. Geological Survey (Norris and Fidler, 1965).…”

“…Three short papers describing special technical aspects of the investigation were prepared for professional journals. Two of the papers (Norris andFidler, 1965, 1966a) describe results of particlesize analyses; the third (Norris and Fidler, 1966b) describes application of a method for determining the vertical permeability of the aquifer. Only the significant findings reported in these journal articles are repeated here.…”