Discussion of 'Simplified Method for Sizing Laterals with Two or More Diameters' by Muluneh Yitayew.

The article discusses a study which determined the dimensions of a canal having side walls lined with loose riprap rock and channel bottom unlined. It offers information on another method of solution that applies the particle swarm optimization (PSO) technique with the changed objective function. The article also discusses a hydraulically efficient channel and the slope of channel side walls and bottom width.