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<br /> <br /> <br />Figure 15.--Pea Creek near Louisville, Ala. <br /> <br />Computed roughness coefficient: Manning's n = 0.14 <br /> <br />Date of flood: December 21, 1972 <br /> <br />Date of picture: March 13, 1979 <br /> <br />Depth of flow in flood plain: 2.9 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. Minor surface irregularity (some <br />rises and depressions). Obstructions are minor (downed trees and <br />limbs and a buildup of debris). Little ground cover with a small <br />amount of undergrowth made up of small trees and vines. Vegb = <br />0.0085 and C* = 15.6. The selected values are nb = 0.025, <br />nl = 0.005, n3 = 0.015, n4' = 0.005, and no = 0.050. <br /> <br />33 <br />