A 1 m wide rectangular channel has a bed slope of 0.0016 and the Manning's roughness coefficient is 0.04. Uniform flow takes place in the channel at a flow depth of 0.5 m. At a section, gradually varied flow (GVF) is observed and the flow depth is measured as0.6 m. The GVF profile at that section is classified as S2 M1 M2 S1 O O

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