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<br /> <br /> <br />Figure 13. --Yockanookany River near Thornastown, 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 (a few downed <br />trees and limbs). Ground cover and undergrowth are negligible. <br />Vegd = 0.0082 and C* = 7.6. The selected values are nb = <br />0.025 and no = 0.025. <br /> <br />31 <br />