Hydraulic Design of Flood Control Channels presents procedures for the design analysis and criteria of design for improved channels that carry rapid and/or tranquil flows. Flow at confluences and side drainage inlet structures are among the procedures discussed in detail with the aid of Hydraulic Design Criteria charts. Riprap protection for channel slopes less than two percent and for open channels not immediately downstream of stilling basins or other highly turbulent areas are addressed. Key appendices include a report on the standardization of riprap gradations, the capability of quarries to produce various riprap gradations, and the sensitivity of changing gradations during a production cycle.