The physiography of the river Nile and is basin . and l>lue Nile,the two variable factors of the sununer or low-stage sup[)ly. will but little. On the other hand, it will sometimes occur thata season of deficient rainfall may improve towards the end, as was thecase in 19(IH, when the increased rainfall in the autunui provided agood low-stage su{)ply for 1904. It is, therefore, rather on the amount of rain falling at the end ofthe rainv season in Abyssinia, and its continuance into the autumnmonths, that a good low-stage supply depends; the Sobat keeps up thelevel of the White
The physiography of the river Nile and is basin . and l>lue Nile,the two variable factors of the sununer or low-stage sup[)ly. will but little. On the other hand, it will sometimes occur thata season of deficient rainfall may improve towards the end, as was thecase in 19(IH, when the increased rainfall in the autunui provided agood low-stage su{)ply for 1904. It is, therefore, rather on the amount of rain falling at the end ofthe rainv season in Abyssinia, and its continuance into the autumnmonths, that a good low-stage supply depends; the Sobat keeps up thelevel of the White Nile with the water it brings from the high-landsof Kaffa, and the Blue Nile is fed by its tributaries in Gojam andWallega. In 11)03, the Blue Nile was discharging nothing at Kliar-touir. on the Sth, and 2rird of May, after the deficient rainfallof 1902. • Bull. .Soc. KheJ. fi^)::,, .ImiUarv. 1SJ4, Caini. L(H-. cit., p. 41. The Aswan Kusurvuii- ;iiul I.;iUu Moeris. , lUiil ; ami Sue. Khed. Oeog., .lanuary 1901 > X UJH<. — . — Sir W. Wilkocks,ill his ))ap(r on the WmW liavnii. refers inriflen-tally to the prediction ot the Nile considers tliat good Hoodscoincide with high humidity in June, anfl with a prevalence of south-erly winds in April and ^lay at Cairo; also that deficient floods areheralded by excejjtional dryness in June and few southerly winds inApril and May. In the 33 years—1X70 to —the mean relative humidity inJuncis not of anv real value asa jiiiidu in prediction, since out of 19 years inwhich the relative humiditv in June was above the mean, 9 floods werel)elow the average, and 10 wereal)c)ve it ; and of 13 years in which thehumidity was below the mean, S floods were above the average and 5were below it. Turning now to the southerly wind>. the number of observetl windsof which the illrection was south of east or west (from some Jtart, thatis, of the southern half of the horizon) hasl)eeu Uiken from tlrj 3dio
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectwatersupply, bookyear
