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<br />initial elevation. Detailed results rely upon the adequate number of points <br />used . <br /> <br />3. me number of GR points used in defining the ground profile also <br />affects the canplting time because these points are executed a great number <br />of times for each job. Points that are definitely outside the flow boundary <br />level should be deleted during initial editing. However, because of the <br />possibility for bank erosion, there should be sufficient points to cover any <br />such potential changes. <br /> <br />4. Ineffective flow areas should be specified, either by excluding <br />them fran the GR points or by raising the GR elevations above the water <br />level. <br /> <br />5. very fine sediments with a grain size less than 0.0625 ImI consti- <br />tute the wash load and should be excluded fran the size-fraction data on GS <br />records . <br /> <br />6. The bank erodibility factor, BEF, in Field 5 of Record Gl, is a <br />control for the rate of channel widening. A small value slows down <br />widening. This value should be calibrated against field data whenever <br />possible. <br /> <br />7. The radius of curvature, RAD, in Field 3 of the XF record may be <br />specified only if the station of the concave bank is specified in Field 1 or <br />2 of the XF record. Onder this situation, lateral migration is controlled <br />by RLMN in the G3 record. In using this option, the GR stations should be <br />approximately equally spaced in the erodible part of channel. <br /> <br />8. The radius of curvature rc (or RAD) along a reach between two adja- <br />cent cross sections is canplted by interpolating those defined at the cross <br />sections. Since rc has infinite value at a straight section, its adjacent <br />reaches also have infinite rc' For this reason, a curved reach must be <br />between cross sections with finite rc values. <br /> <br />9. The device codes for running this program are as follows: 1 for <br />34 <br />