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<br />SYMBOLS AND UNI'IS <br /> <br />Symbol Definition Units <br /> <br /> <br />A cross-section area of flow ft2 <br /> <br /> <br />ZAi the total frontal area of vegetation blocking the flow ft2 <br /> <br />C* effective drag coefficient for vegetation <br /> <br />d84 <br /> <br />g <br />h <br /> <br />K <br /> <br />L <br /> <br />1 <br /> <br />particle diameter that equals or exceeds that of 84 <br />percent of the particles <br /> <br />ft <br />ft/s2 <br /> <br />gravitational constant <br /> <br />height of water on flood plain <br /> <br />ft <br />ft3/s <br /> <br />conveyance of a section <br /> <br />length of channel reach being considered <br /> <br />ft <br /> <br />length of representative sample area <br /> <br />ft <br /> <br />m correction factor for meandering of channel or flood <br />plain <br /> <br />n <br /> <br />nb <br /> <br />Znidi <br /> <br />no <br /> <br />nl <br /> <br />n2 <br /> <br />n3 <br /> <br />n4 <br /> <br />n4 <br /> <br />Manning's roughness coefficient, including boundary and <br />vegetation effects ftl/6 <br /> <br />base value of Manning's roughness coefficient for the <br />surface material of the channel or flood plain ftl/6 <br /> <br />summation of number of trees in a sample area <br />multiplied by diameter ft <br /> <br />Manning's roughness coefficient, excluding the effect <br />of the vegetation ftl/6 <br /> <br />value of Manning's roughness coefficient for the effect <br />of surface irregularity ftl/6 <br /> <br />value of Manning's roughness coefficient for variations <br />in shape and size of channel and flood plain ftl/6 <br /> <br />value of Manning's roughness coefficient for obstruc- ftl/6 <br />tions <br /> <br />value of Manning's roughness coefficient for vegetation ftl/6 <br /> <br />value of Manning's roughness coefficient used in <br />determining no, representing vegetation not <br />accounted for in vegetation density ftl/6 <br /> <br />iv <br />