Thursday, September 18, 2014

Near record peak discharge on San Pedro River

Although we got very little rain in Tucson from Hurricane Odile remnants, southeastern Arizona and northern Sonora got a lot of rain. The southernmost stream gauge on the San Pedro River is at Palominas, a few miles north of the U.S. – Mexico border. Its peak discharge of 18,500 cfs at 10:15 am this morning is the 2ndlargest flood at this gauge since 1926.  

Dr. Phil Pearthree, chief of the AZGS Environmental Geology Section, warns that we could see some bank erosion and rearrangement of our youngest geologic units along the river, although he expects that the flood peak and the effects of the flood will diminish to the north.   [Right, geologic map along the San Pedro River. AZGS]

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