Frank Eldridge Clarke 1973 <p>In the autumn of 1969, unusual meteorological conditions&nbsp;over Europe and northern Africa caused an enormous persistent desert&nbsp;storm in Tunisia and eastern Algeria. Poorly developed drainage&nbsp;patterns and gypsum-encrusted surfaces of these desert regions intensified&nbsp;effects of the storm and contributed to the heavy loss of life and&nbsp;property. Destruction of Roman bridges suggests that such storms may&nbsp;have recurrence probabilities of several thousands of years. The event&nbsp;also suggests that, although desert storms are less frequent than those of&nbsp;temperate regions, they can be similar in magnitude.</p> application/pdf en U.S. Geological Survey The Great Tunisian Flood article