. 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 . 15 tons is 7500 tons of water peracre, equal to a depth of 66 inches of watertranspired in the growing season of 6 monthsbetween February and August. view of the above given data and all dataobtainable we are justified in assuming that: 1. The evaporation from the area of the Liv-ermore Valley formerly saturated andsupporting a dense growth of tules, wil-lows and wild celery, etc., was at least 66inches per annum, and
. 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 . 15 tons is 7500 tons of water peracre, equal to a depth of 66 inches of watertranspired in the growing season of 6 monthsbetween February and August. view of the above given data and all dataobtainable we are justified in assuming that: 1. The evaporation from the area of the Liv-ermore Valley formerly saturated andsupporting a dense growth of tules, wil-lows and wild celery, etc., was at least 66inches per annum, and that under thepresent crop conditions the evaporationover this area is at least that much perannum. 2. That over the area supporting salt grassand other wild grasses the evaporation isproportional to the depth of water table,being at least 52 inches when the watertable is near the surface. 3. That the water loss by evaporation ap-plicable to large water bodies in AlamedaCounty averages 48 inches per annum,which in its application to the gross draftshould be reduced by that portion of therainfall over the surface of the reservoirnot included in the 40t Appendix E. LOGS OF WELLS IN THE LIVERMORE VALLEY Plate No. E-1 No. 15~Line A. Material. Depth, feet. 14-inch pipe is 19 feet deep. Soil 4 Yellow sandy clay 11 Blue clay 4 Blue clay 6 Yellow clay 15 Blue clay 12 Blue gravel 4 Gravel 12 Blue clay 2 Bottom well 70 feet deep. Pipe cut from 68 to 55 feet. Well No. 2~Line B. 14-inch pipe is 20 feet deep. Soil 4 Blue clay 34 Yellow clay 4 Tight gravel 17 Yellow clay 1 Well 60 feet deep. Pipe cut from 58 to 45 feet. Well No. 6—Line B. 14-inch pipe is 21 feet deep. Soil 5 Yellow clay 14 Blue clay 8 Blue clay 20 Blue clay and gravel mixed 9 Gravel ; 4 Gravel 2 Yellow clay 2 Bottom of well 64 feet deep. Pipe is cut from 62 to 50 feet. Well No. 16—Line A. 14-inch pipe is 22 feet 5 406 Material. Depth, feet. Blue clay 5 Blue clay 32 Blue sandy clay 16 Blue grave
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Keywords: ., bookcentury1900, bookdecade, booksubjectwatersupply, bookyear1912
