River regulation, flood control and water conservation and utilization; hearing before the subcommittee on commerce, United States Senate, Sixty-fourth Congress, first session, on S. 5736, a bill to promote interstate commerce, agriculture, and the general welfare by providing for the development and control of waterways and water resources, for water conservation, for flood control, prevention, and protection; for the application of flood waters to beneficial uses; and for cooperation in such work with states and other agencies and for other purposes.