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<br /> <br /> <br />Figure 8.--Bayou de Loutre near Farmerville, La. <br /> <br />Computed roughness coefficient: Manning's n = 0.11 <br /> <br />Date of flood: March 18, 1973 <br /> <br />Date of picture: February 14, 1979 <br /> <br />Depth of flow in flood plain: 3.7 ft <br /> <br />Description of flood plain: The vegetation of the flood plain consists <br />mostly of large, tall trees including, oak, gum, and ironwood. The <br />base is firm soil that has slight surface irregularities and <br />obstructions caused by downed trees and limbs. Ground cover and <br />undergrowth are negligible. Vegd = 0.0075 and C* = 7.7. The <br />selected values are nb = 0.020, nl = 0.002, n3 = 0.003, and <br />no = 0.025. <br /> <br />26 <br />