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A 'wadi' ( '') is traditionally a valley. In some cases it can refer to a dry riverbed that contains water only during times of heavy rain. Compare arroyo (creek), canyon, gulch and gully.
The term '' is very widely found in Arabic toponyms. Wadis tend to be associated with centers of human population because sub-surface water is sometimes available in wadis.
Crossing wide wadis at certain times of the year can be dangerous, because of unexpected flash floods. Such flash floods cause many deaths each year in Saudi Arabia and many other Middle Eastern countries.
In North Africa the French transcription 'oued' is often used, although it is also employed to refer to true rivers. In southwestern Africa, the term 'rivier' is used, which is the Afrikaans word for "river".
Some names of Spanish rivers are derived from Andalusi Arabic toponyms where '' was used to mean a permanent river, for example Guadalquivir from ''al-wādī al-kabīr'' = "the great river".

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Wadi deposits

Other references

Wadi deposits

Wadis are the streams in a desert environment and generally are dry year round except after a rain. The desert environment is characterized by a sudden but heavy rain. As rainfall occurs near hill ranges….wadis usually form near a hilly terrain. The deposition of wadi is rapid because of the sudden loss of the velocity and absorption of the water into the ground. Fluvial activity in a desert environment is also characterized by the flash flood.

Other references

Job speaks of his friends whom he calls brothers as being like these Wadis. The Jewish Study Bible transliterated the word brook in Job 6:15a for the word Wadi. The commentator notes, "Wadi, a seasonal stream that may be dangerously overflowing in winter and dry in summer". Albert Barnes (1798–1870), in his commentator books notes, "The idea here is, that travelers in a caravan would approach the place where water had been found before, but would find the fountain dried up or the stream lost in the sand; and when they looked for refreshment, they found only disappointment. The reference to this verse is found in Proverbs 25:19 where it reads that confidence in a treacherous person, an unfaithful person, is like a broken tooth and a foot out of joint." Barnes points to their ineffectiveness rather than emphasis to the pain of the two.