The Lake Sources Of Central Africa Support The Life Of Egypt, By
Supplying A Stream, Throughout All Seasons, That Has
Sufficient
volume to support the exhaustion of evaporation and absorption;
but this stream, if unaided, could never overflow its banks,
And
Egypt, thus deprived of the annual inundation, would simply
exist, and cultivation would be confined to the close vicinity of
the river.
The inundation, which by its annual deposit of mud has actually
created the Delta of Lower Egypt, upon the overflow of which the
fertility of Egypt depends, has an origin entirely separate from
the lake-sources of Central Africa, and the supply of water is
derived exclusively from Abyssinia.
The two grand affluents of Abyssinia are, the Blue Nile and the
Atbara, which join the main stream respectively in N. lat. 15
degrees 30 minutes and 17 degrees 37 minutes. These rivers,
although streams of extreme grandeur during the period of the
Abyssinian rains, from the middle of June until September, are
reduced during the dry months to utter insignificance; the Blue
Nile becoming so shallow as to be unnavigable, and the Atbara
perfectly dry. At that time the water supply of Abyssinia having
ceased, Egypt depends solely upon the equatorial lakes and the
affluents of the White Nile, until the rainy season shall again
have flooded the two great Abyssinian arteries. That flood occurs
suddenly about the 20th of June, and the grand rush of water
pouring down the Blue Nile and the Atbara into the parent
channel, inundates Lower Egypt, and is the cause of its extreme
fertility.
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