Glen Canyon Dam has reduced the sediment supply to the Grand Canyon and decreased the magnitude and frequency of floods that deposit sand and rebuild the beaches.
(Glen Canyon Dam; has reduced; the sediment supply; to the Grand Canyon) (Glen Canyon Dam; decreased; the magnitude and frequency of floods) (floods; deposit; sand) (floods; rebuild; the beaches)
Glen Canyon Dam Glen Canyon Dam floods floods
has reduced decreased deposit rebuild
the sediment supply to the Grand Canyon
the magnitude and frequency of floods
sand
the beaches