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<br /> <br /> <br />Figure 12.--Yockanookany River near Thomastown, Miss. <br /> <br />Computed roughness coefficient: Manning's n = 0.12 <br /> <br />Date of flood: April 12, 1969 <br /> <br />Date of picture: March 28, 1979 <br /> <br />Depth of flow on flood plain: 4.0 ft <br /> <br />Description of flood plain: The vegetation of the flood plain consists <br />mostly of trees including oak, gum, and ironwood, and there are many <br />smaller diameter trees. The base is firm soil and the surface has <br />little irregularity. Obstructions are negligible. Ground cover and <br />undergrowth are negligible. Vegd = 0.0082 andC~=-7.6. The <br />selected values are nb = 0.025 and no = 0.025. <br /> <br />30 <br />