V.C. Fishel
1935
<p><span>Many of the water‐bearing formations in the United States have </span>hydraulic<span> </span>gradients<span> of much less than 20 feet to the mile, and some may have </span>gradients<span> of less than one foot to the mile, whereas most laboratory‐</span>tests<span> of </span>permeability<span> are made with much higher </span>gradients<span>. An investigation was therefore undertaken by the writer, under the direction of 0. E. Meinzer, in the Hydrologic Laboratory of the United States Geological Survey, to determine whether Darcy's law is valid for very </span>low<span> </span>hydraulic<span> </span>gradients<span>—that is, whether under such </span>low<span> </span>gradients<span> the rate of flow remains proportional to the </span>gradient<span>. In a previous paper by Meinzer and the writer (Amer. Geophysical Union,15th annual meeting, pp.405–409, 1934), it was shown that for the sand tested the rate of flow varies directly with the </span>hydraulic<span> </span>gradient<span> down to a </span>gradient<span> of about one foot to the mile. More recently six additional </span>tests<span> have been made on this sand with the same apparatus, and these </span>tests<span> give evidence of the validity of Darcy's law for still lower </span>gradients<span>.</span></p>
application/pdf
10.1029/TR016i002p00499
en
American Geophysical Union
Further tests of permeability with low hydraulic gradients
article