Arroyo (watercourse)

Dry watercourse with flow after rain

An arroyo (from the Spanish arroyo (Spanish: [aˈroʝo], "brook") or wash is a dry watercourse that temporarily or seasonally fills and flows after sufficient rain. Flash floods are common in arroyos following thunderstorms. It is akin to the Catalan rambla, which stems from the Arabic rámla, "dry river".

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