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<br /> <br /> <br />Figure 20.--Thompson Creek near Clara, Miss. <br /> <br />Computed roughness coefficient: Manning's n = 0.20 <br /> <br />Date of flood: March 3, 1971 <br /> <br />Date of picture: March 29, 1979 <br /> <br />Depth of flow on flood plain: 2.9 ft <br /> <br />Description of flood plain: The flood plain is covered with a mixture of <br />large and small trees including oak, gum, and ironwood. The base is <br />firm soil that has minor surface irregularities. Obstructions are <br />minor (some downed trees and limbs). Vegetation is medium with some <br />ground cover and a large amount of undergrowth such as vines and <br />palmettos. Vegd = 0.0115 and C* = 22.7. The selected values <br />are nl = 0.025, n2 = 0.005, n3 = 0.010. n4' = 0.015 and <br />no = 0.055. <br /> <br />38 <br />