This report was prepared by the Technical Coordination Branch of the Water Resources Division of the Geological Survey as a part of the investigation of water-utilization problems. The junior author, Mr. Maddock, is assistant chief of the Hydrology Division, Bureau of Reclamation. The authors have benefited greatly from constructive suggestions made by many friends and colleagues. Particular acknowledgment is due J. Hoover Mackin and Walter B. Langbein whose counsel and criticism contributed greatly to whatever of value is contained in this report. Among the persons who read an early draft and whose suggestions are highly valued are A

A. Analyses of sand sizes used in flume experiments and fed into flume-river. _ _ _ _. _ _ _ _ _ _ _ B. Data o n size characteristics of sand on channel bed and on bars in flume-river.__ _ _ _ _ _~-~- .- .-C. Summary of data on flume experiments a t California Institute of Technology .__._-~ ~. .- .-D. Comparison of hydraulic characteristics of uiidivided and divided reaches of braided streams.

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__________ Introduction_______________________________________ Frequency of overbank flow.__________________________ Formation of a typical flood plain_____._______________ The characteristics of point bars._________________ Sediments forming a typical point bar_________ Process of formation and elevation of the surface of point bars.____________________________ Rate of lateral migration.___________________ Overbank deposition.__^________________________ Nature and amount of overbank deposition Natural levees,_____________________________

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