Stable Knickpoint at Lava Falls in Grand Canyon

Aerial photographs of the debris fan at Lava Falls Rapid. A, (March 24, 1996) Lava Falls Rapid was constricted by a 1995 debris flow from Prospect Canyon. B , (April 9, 1996) Reworking during the rising limb of the 1996 controlled flood removed 5,900 m 3 of the edge of the fan, increasing the width of the rapid by an average of 5 m. (Courtesy of the USGS)

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Uploaded: Jul28 08

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