. The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army . or other floods, may be put over the Sanolgravels, and these may be more vigorously at-tacked, as contemplated in our former is also possible to put Positos and Cottonwoodwaters on the gravels of the Arroyo Valle on thesouth side of the valley. It is not just to con-sider all of this water wasted, as Mr. Williamsdoes on page 188. In our judgment there is nocoutiouous clay cap over the Pleasanton Williams states
. The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army . or other floods, may be put over the Sanolgravels, and these may be more vigorously at-tacked, as contemplated in our former is also possible to put Positos and Cottonwoodwaters on the gravels of the Arroyo Valle on thesouth side of the valley. It is not just to con-sider all of this water wasted, as Mr. Williamsdoes on page 188. In our judgment there is nocoutiouous clay cap over the Pleasanton Williams states that it has springs andholes through it, and the water comes upthrough it (pages 254 and 260). If the waterwill come up through, the clay cap, whendrained below it would admit surface waterdownward. In our opinion there is no justifi-cation for concluding that there is an imperviousbarrier between the north and south sides of thevalley northwest of Pleasanton. Our observa-tions here, and elsewhere, are that the clay andgravel are laid down in irregular masses, orlenses, that are not continuous. See logs, pages286 and 287, of closely adjacent wells. We con-. ? • IBIlt 198 INFLOW INTO LIVERMORB GRAVELS. 199 sider the Geological Sections given by Mr. Wil-liams, on line N. & S. 4, page 278, and B. and , page 272, show the gravels as practicallycoming to the surface at well 30-A. GeologicalSection N. & S. 3, page 277, indicates that therereally is no dyke across this valley between wells93 and 63. Also see F line of wells, page 285,and H line, page 287, which show sand at sur-face in places. Alkaline waters, crowding infrom the north, would show their characteristic,whether they were in motion or not. Their dif-ferent mineral contents may show a separateorigin, but not a different destiny. (Pages 365and 366.) Inflow Into the Gravels. Mr. Williams has extensivelj^ discussed thecapacity of a certain prism drained during a100-day period, the volume of which is com-puted from the o
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Keywords: ., bookcentury1900, bookdecade, booksubjectwatersupply, bookyear1912
