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<br />6 <br /> <br />TDZAMA <br /> <br />o <br />+ <br /> <br />8 <br /> <br />RLMN <br /> <br />o <br />+ <br /> <br />10 <br /> <br />RID <br /> <br />+ <br /> <br />G4 gecord <br /> <br />used and Manning's n is simulated in the model. <br /> <br />Erodible bed layer is 100 it (30.5 m) thick. <br />Thickness of erodible bed layer in ft or m. This <br />value is applied to the entire channel reach but <br />it may be redefined for a section using Field 10 <br />of the XF record. <br /> <br />Lateral migration of channel is not considered. <br />Maximum rate of lateral migration in feet (or me- <br />ter) per day at average discharge. Enter average <br />discharge in cfs (or ems) in Field 9 of G3. <br /> <br />Width of rigid bank zone, in ft or m. It is used <br />to specify the width of bank protection of snall <br />channel in a flood plain. Channel and flood plain <br />areas outside this zone remain erodible. <br /> <br />This is an optional record used to select certain cross sections for <br />outj;Ut at each sunmary outj;Ut. Up to 4 cross sections may be selected. <br />Each cross section is identified by its number which is counted form the <br />downstream section. <br /> <br />Field Variable Value Description <br />0 IA G4 Record identification characters <br />1 IPLTl + Number of cross section <br />2 IPLT2 + Number of cross section <br />3 IPLT3 + Number of cross section <br />4 IPLT4 + Number of cross section <br /> <br />GS Record <br /> <br />TwO GS records are required for each job, used to specify initial bed- <br />material canpositions in the channel at the downstream and upstream cross <br />sections. The first GS record is for the downstream section and the second <br />is for the upstream section. From upstream to downstream, exponential decay <br />in sediment size is assumed for the initial distribution. Sediment composi- <br />tion at each section is represented by five size fractions. <br /> <br />29 <br />