San Francisco water . The volume of the Nile, says Frank , 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
San Francisco water . The volume of the Nile, says Frank , 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. 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 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 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectwatersupply, bookyear
