Rainbow does not like mentruating women to enter the water, or even to drink from it. One day a young woman broke this taboo because her mother and sisters didn't leave her any drinking water when they left for the day. Driven by thirst, she went to the lagoon. When she had returned, Rainbow, full of anger, cause a strong wind, accompanied by whirlwinds and heavy rain. All were drowned in the ensuing flood. [Bierhorst]
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References: Bierhorst, John. The Mythology of South America, William Morrow, New York, 1988.