Note 22 — 5. Permanence of Lakes.

Mr. Beadnell (‘An Egyptian Oasis’ (London, 1909), p. 139) estimates the total discharge of the Kharga wells at 53,000 cubic metres per diem. We should not, I think, err greatly in estimating the total output of all the Egyptian oasis wells and springs at about five times this, or 250,000 cubic metres per diem. As the average daily discharge of the Nile in Egypt is about 180 million tons, a local influx into it several times as great as the total discharge of the oasis wells would represent but an insignificant addition to the discharge of the Nile. I think, however, that the influx of the warm water might possibly be detected by careful thermometric measurements made in the river near its banks at the time of low Nile.