File:San Francisco water (1925) (14783488092).jpg

Identifier: sanfrancwat4192581930spri (find matches)
Title: San Francisco water
Year: 1922 (1920s)
Authors: Spring Valley Water Company (San Francisco, Calif.)
Subjects: Water-supply
Publisher: San Francisco, Calif. : Spring Valley Water Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: California State Library Califa/LSTA Grant

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
The volume of the Nile, says Frank G.Carpenter, is enormous. At flood times, abillion tons of water go by at Assouan everyday. The river then rises twenty-five feet atCairo, thirty-eight at Old Thebes, and al-most fifty feet at the first cataract. There isso much water that no dam could hold it,hence all of these great works had to be madeso that the water can be let in and out andallowed to pass through at will. It is at flood time that the Nile valleygets its rich feed of Abyssinian mud. Thisis brought down in part by the Blue Nile,but more abundantly by the Atbara, or Black January, 1928 SAN FRANCISCO WATER
Text Appearing After Image:
The carriers set out to bring Nile water to the consumer Nile. It is carried by the inundation all overEgypt and by means of irrigation conductedto nearly every farm. After the floods subsidethe muddy waters grow clear again. TheBlue Nile and the Black Nile become almostdry, and the white water of the main, orVictoria, Nile is about all that Egypt has.It is this white water that is stored up bythe Assouan Dam, and it feeds the countryin much the same way as our irrigation ca-nals do, with water only and not with a thickmixture of water and mud as in the times ofoverflow. For thousands of years these rivers have been pouring downthrough this Nilevalley; but when-ever the rains havebeen scanty in thehighlands of Abys-sinia and in CentralAfrica the mainstream has not beenhigh enough to reachthe whole country.Most of the landscould be inundatedonly once a year,and if the Nile wasespecially low somecould have no waterat all. By the presentsystem Egypt haswater all the yearround, and enough

Note About Images