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<br />r. Profile Plot. This plot includes not only the water surface eleva- <br />tion, but the critical water surface elevation, energy grade line, channel <br />invert, left and right bank elevations, and the maximum elevation of the <br />cross section for which hydraulic properties can be computed. The vertical <br />scale of the profile may be determined by the user using the variable PRFVS <br />(which allows breaking the profile before the plot runs off the sheet) or by <br />the computer (no break in the profile) if left blank. Profiles are plotted <br />automatically for jobs using more than five cross sections. Profile plots <br />may be suppressed by inputting a negative value for PRFVS. <br /> <br />s. Program Trace. <br /> <br />(1) It is sometimes useful to print out important variables as they <br />are computed by the program to aid in checking, debugging and understanding <br />the program. niO program traces are available for this purpose. The major <br />trace prints values of variables used in the fallowing computations: <br /> <br />(a) Interpolated cross sections <br />(b) :t-1anning t s unit from known water surface elevations <br />(c) Computed water surface elevation <br />(d) Weir flow <br />(e) Critical water surface elevation <br /> <br />(2) The minor trace prints values of variables used in the computation <br />of the hydraulic properties of each subarea of a cross section. <br /> <br />(3) ITRACE on cards J2 and X2 are used to specify the desired trace. <br />The major trace may be called separately, ITRACE = I, or in combination with <br />the minor trace, ITRACE = 10. If all cross sections are to be traced, card J2 <br />is used. If only individual cross sections are to be traced, card X2 is used. <br /> <br />5. I"PUT <br /> <br />a. General. The various types of cards used for input (see exhibit 10) <br />are iuentified by two characters in card columns 1 and 2. These characters <br />are read by the computer to identify the card and corresponding variab les. <br />~xnibit 10 contains a description of each card type. Since some cards have <br />similar purposes, it is helpful to discuss them together. <br /> <br />b. Data Comment Cards. These cards are optional and are used to print <br />out description of cross sections in the data. <br /> <br />c. Title Cards - Tl, T2, & T3. Three title cards are required for ea~h <br />jo~. The titles specified on the cards are read in alpha format and printed <br /> <br />13 <br />