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Stream Piracy in Israel / על כיבושי הנחלים בארץ-ישראל(בייחוד בקרבת פרשת-המים הראשית)

מנשה הראל and M. Harel
Bulletin of the Israel Exploration Society / ידיעות החברה לחקירת ארץ-ישראל ועתיקותיה
Vol. כא‎, No. ג/ד‎ (תשי"ז / 1957), pp. 216-225
Stable URL: http://www.jstor.org/stable/23730337
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Stream Piracy in Israel / על כיבושי הנחלים בארץ-ישראל(בייחוד בקרבת פרשת-המים הראשית)
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Abstract

Close scrutiny of the map of Palestine shows a number of anomalous stream patterns. Some of them seem to indicate definite cases of piracy. In all cases it is the drainage basin of the Jordan which captured valleys the original direction of which was oriented towards the Mediterranean. This appears peculiar at first sight as the Jordan basin has an arid climate with rainfall amounts much smaller than those of the western slope draining to the Mediterranean. An analysis of gradients shows that it is the much steeper gradients of the eastern drainage which outweigh the higher rainfall of the western drainage basin. The same relation holds good in the arid Negev where the runoff factor is higher than in the more humid north. This is due to the occurrence of semi-permeable strata and crusts which prevent absorption of rainfall by the rocks.

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