Large floods leave sediment deposits where the main gorge (upper left to lower right) and the incised secondary meander train (lower left) intersect.  Usually, a large eddy develops at the mouth of the secondary meander leaving a mound of sediment.  Beyond this point, the secondary meander is backflooded, leaving fine deposits that bury tributary drainage systems.  These channels re-incise when flow levels in the main gorge recede.  Photo was taken while the normally dry river was still flowing just after the 1988 flood.  Freshly deposited sediment and standing water can be seen in the secondary meander.  A mud drape can also be seen in the main gorge extending up to the base of the rock walls.