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World Water Day: Citizen scientists provide valuable information on intermittent rivers
A citizen scientist on horseback collects data along the San Pedro River in Arizona.
Credit: Julia Fonseca
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Citizen scientists record the end of a wet section of the San Pedro River.
Credit: Kelly Tighe
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A dry stretch of the San Pedro River.
Credit: Daniel Allen
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The San Pedro River looks much different when water courses through it.
Credit: Daniel Allen
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Arizona's Agua Fria River, viewed from one of its dry stretches.
Credit: Daniel Allen
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A wet section of the Agua Fria River.
Credit: Daniel Allen
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