62
ERDC TR-04-1
Figure 18. Aerial photographs of Ruelas Fan near Marana, Arizona, taken in 1936 and 1988,
showing an avulsion that occurred between 1949 and 1956. The arrow, in the same posi-
tion on both photos, highlights the pre-existing channel reach into which flow was
diverted. The letter "a", indicating the fan apex, is in the same position on both photos.
(Modified from Field 2001.)
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