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<br /> <br /> <br />Figure 6.--Cypress Creek near Downsville, La. <br /> <br />Computed roughness coefficient: Manning's n = 0.10 <br /> <br />Date of flood - February 21, 1974 <br /> <br />Date of picture: February 13, 1979 <br /> <br />Depth of flow in flood plain: 2.6 ft <br /> <br />Description of flood plain: The vegetation of flood plain consists <br />mostly of trees including oak, gum, and pine. The base is <br />firm soil that has slight surface irregularities. Obstructions <br />are negligible (a few downed trees and limbs). Ground cover <br />and vines are negligible. Vegd = 0.0067 and C* = 12.0. <br />The selected values are nb = 0.025, nl = 0.005, n3 = <br />0.005 and no = 0.035. <br /> <br />24 <br />