File: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 (1912) (14586624438).jpg

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Identifier: cu31924004975805 (find matches)
Title: 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
Year: 1912 (1910s)
Authors: Spring Valley water company, San Francisco
Subjects: Water-supply
Publisher: (San Francisco, Printed by the Rincon publishing company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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THE EVAPORATION FROM SATURATED SOILS WILL BE CONSUMED. 483
Text Appearing After Image:
CURVES SHOWING DIRECT RELATION BETWEEN MEAN MONTHLY TEMPERATURE AND EVAPORATION. 484 WATER SURFACE EVAPORATION. 485 It was found that most of the soil contains ahigh percentage of clay, varying from thetenacious black adobe of the upper slopes, tothe more friable peaty soils of the old swamp.A very small proportion along the arroyos issandy clay. Inspection of the clay soils showedmoisture within two inches of the surface any-where within the 9 ft. contour depth to ground-water, indicating that eveporation was occur-ring from practically all of the areas within thiscontour. At the 6 ft. contour and within, thesurface was quite moist where not cultivatedand supported the vegetation typical of shallowground water. Where the surface was tilled akick of the heel would uncover moist soil.Every indication went to show that at the timeof our visit, evaporation was occurring to agreater or less extent from the whole area with-in the 9 ft. contour, and our experience inOwens Valley confirms th

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  • bookid:cu31924004975805
  • bookyear:1912
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Spring_Valley_water_company__San_Francisco
  • booksubject:Water_supply
  • bookpublisher:_San_Francisco__Printed_by_the_Rincon_publishing_company
  • bookcontributor:Cornell_University_Library
  • booksponsor:MSN
  • bookleafnumber:529
  • bookcollection:cornell
  • bookcollection:americana
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29 July 2014
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