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<br />and a bottom width (BW). Up to five different bottom widths may be specified <br />for the execution of a single run. Figure 4 shows a sample application <br />of the CHIMP option; note that improved section is modified only by excava- <br />tion and not by fill. <br /> <br />_ 1140 <br />.... <br />hi <br />hi <br />U. <br />;; <br />z 1130 <br />o <br />~ <br />> <br />hi <br />..J <br />hi 1120 <br /> <br />1160 <br /> <br /> <br />1150 <br /> <br />XLSs= 3 I <br /> <br />1110 <br /> <br />1100 <br />o <br /> <br />100 <br /> <br />200 <br /> <br /> <br />LsTA=350 <br /> <br /> <br />CELCH= 1110 <br /> <br />LEGEND: <br />~ Area Removed <br />o GR Dolo Poinls <br /> <br />X GR Data Painls Added <br />by CHIMP Opllon . <br /> <br />600 <br /> <br />Figure 4. A Stream Cr'oss Section 3efore and Mter CHH1P Modification <br /> <br />BW =100 <br /> <br />300 <br /> <br />400 <br /> <br />500 <br /> <br />STATION ( IN FEET) <br /> <br />9. I NTERPOLP.TEO CROSS SECTIONS <br /> <br />Occasionally it is necessary to insert cross sections between those <br />specified by input, because the change in velocity head (dHV) is too great <br />to accurately determine the energy gradient. Additional cross sections <br />may be coded manually or a program option may be requested to input inter- <br />polated cross sections. The option specified by the variable HVINS on <br />the Jl card will insert up to three interpolated cross sections between <br />two adjacent input cross sections. HVINS is the user specified maximum <br />allowable change in velocity head between adjacent cross sections. When <br />the program determines that dHV between the current cross section and the <br />previous cross section exceeds the user specified criterion, the program <br />will automatically insert one to three cross sections (depending on the <br />magnitude of (dHV/HVINS) - 1). <br /> <br />21 <br />