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<br /> 16 <br /> . <br /> . <br /> 14 <br />~ <br />* <br />\0 <br />~ <br />~ 12 <br />z <br />w . . <br />U <br />ii: . <br />LL <br />W <br />0 .. <br />0 10 . <br />CI <br />< . <br />a: . <br />0 . <br />I <br />W . . <br />> . <br />i= 8 <br />0 <br />W <br />LL <br />LL <br />W <br /> . <br /> 6 <br /> <br /> <br /> <br />4 <br />2 <br /> <br /> <br />3 <br /> <br />4 <br /> <br />5 <br /> <br />HYDRAULIC RADIUS (R). IN FEET <br /> <br />Figure 3.--Plot of effective-drag coefficient versus hydraulic radius <br />for wide, wooded flood plains using verified n values. <br /> <br />Sampling area.--A representative-sample area must be chosen on the <br />cross section to represent the roughness of the cross section accurately. <br />The flood plain can be divided into subsections due to geometric and (or) <br />roughness differences in the cross-section reach. The vegetation density <br />is determined for each subsection. <br /> <br />19 <br />