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<br /> <br /> <br />Figure 14.--Flagon Bayou near Libuse, La. <br /> <br />Computed roughness coefficient: Manning's n = 0.13 <br /> <br />Date of flood: December 7, 1971 <br /> <br />Date of picture: April 10, 1979 <br /> <br />Depth of flow on flood plain: 3.2 ft <br /> <br />Description of flood plain: The vegetation of the flood plain consists <br />mostly of a mixture of large and small trees including oak, gum, and <br />ironwood. The base is firm soil that has minor surface irregulari- <br />ties with some rises. Obstructions are negligible (some exposed <br />roots and small trees). Ground cover and undergrowth are negligible. <br />Vegd = 0.0087 and C* = 11.5. The selected values are nb = <br />0.025, nl = 0.003, n3 = 0.002 and no = 0.030. <br /> <br />32 <br />