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<br /> <br /> <br />Figure 18.--Sixmile Creek near Sugartown, La. <br /> <br />Computed roughness coefficient: Manning's n = 0.18 <br /> <br />Date of flood: March 23, 1973 <br /> <br />Date of picture: April 11, 1979 <br /> <br />Depth of flow on flood plain: 5.0 ft <br /> <br />Description of flood plain: The vegetation of the flood plain is covered <br />with mostly large trees including oak, gum, ironwood and pine. The <br />base is firm soil that has moderate surface irregularities caused by <br />rises and depressions. Obstructions are negligible (a few vines). <br />Ground cover and undergrowth are negligible. Vegd = 0.0084 and <br />C* = 13.3. The selected values are nb = 0.025, nl = 0.008, <br />n3 = 0.002, and no = 0.035. <br /> <br />36 <br />