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<br />at the beginning of each job. Card columns 9-32 on the third title card <br />(card T3) are reserved for the river name, which will be printed to title <br />the cross section and profile plots. <br /> <br />d. Job Cards - Jl, J2, J3, & J4. These cards are used to specify <br />starting conditions, i.e., Q, water surface elevation, direction of flow, <br />and various options for each job. Card J2, J3 and J4 are used only when <br />the options or variables on the card apply. Cards Jl and J2 are used for <br />each profile while cards J3 and J4 are used only on the first profile in <br />a multiple profile run but apply to all. <br /> <br />e. f.hange Cards - NC, QT, B!h. NV, CI, & ET. Card NC is required at <br />the start of a job to initialize Hanning's "n" values, and expansion and <br />contraction coefficients. It may also be used to change these values at <br />any cross section within a job. When the initial values are changed, they <br />remain changed for the remainder of the job unless another change card is <br />entered. Cards QT, NH, :rv, CI and ET are also used to change starting <br />conditions within a job. \;hen the starting conditions are changed, the <br />new value is used for all subsequent cross sections unless another card <br />is used to make another change. Each change begins at the next cross <br />section described by card Xl except for the CI card which is placed between <br />the Xl and GR cards where the change occurs. <br /> <br />f. ~ross Section Cards - Xl, X2, X3, X4, & GR. Cards Xl and GR <br /> <br />are required for cross seetions unless NPROF on eardJ2 is 2 or greater <br />in which case the cross section data read for the previous job would be <br />used. Cards X2, X3 and X4 provide additional options that apply to the <br />current cross section and can be used or omitted as desired. The purpose <br />of these cross section cards is to completely describe each river cross <br />sec~ion ~hich is representative of the reach, and to specify program <br />optJ.ons tor that cross section. <br /> <br />g. Bridge Cards - SB & BT. Card SB is required whenever the special <br />bridge routine is used (IBRID - 1 on card X2). Card BT is included when <br />stations and elevations of the top of roadway and low chord are to be read <br />for either the normal or special bridge routines. The GR cards before and <br />after Card SB must describe the constricted cross sections (effective section <br />should be changed where weirflow occurs, see exhibit 3) immediately adjacent <br />to the bridge to account for transition losses between the river cross section <br />and the bridge. The special bridge routine computes only the losses through <br />the bridge. <br /> <br />h. End of Job Card - EJ. Each job that contains any of the cards NC <br />through GR must be ended with an end of job card, which signifies the end <br />of input data. <br /> <br />14 <br />