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<br />PROGRAM INPUT <br /> <br />1. GENERAL <br /> <br />Twenty-seven different cards may be utilized to specify the many <br />options and data input requirements for computer program HEC-2. These <br />cards are described in detail in Appendix VII, In qeneral the various <br />cards may be classified into the following five categories: documentation, <br />job control, change, cross section and bridge data cards. Cards in each <br />of the five categories are described briefly in the following sections. <br /> <br />2. CARD FORMAT <br /> <br />Data cards are layed out in ten fields of eight columns each. One <br />variable is used for each field except the first field, where the first <br />two card columns are used for the card identification characters (i.e., <br />Tl, Jl, GR). The format specification for each data card is A2, F6.0, <br />9FB.O. If decimal points are not indicated in the data, all numbers must <br />be right justified within the field. Where the user desires to punch <br />a decimal point it may appear anywhere within the field. All blank <br />fields are read as zeroes. The program uses -1, 1, 10 and 15 to specify <br />certain program options. Any number without a sign is considered posi- <br />tive. <br /> <br />3. DATA ORGANIZATION <br /> <br />Data sets for HEC-2 have a range encompassing, at a minimum, a single <br />job (profile) with one cross section, to a run consisting of fourteen <br />profiles with eight hundred cross sections. The minimum data set would <br />require cards Tl, T2, T3, Jl, NC, Xl, GR, EJ, three blanks, and ER. <br />Multiple profile data sets using the same cross sections are constructed <br />by inputting successive sets of Tl, T2, T3, Jl, and J2 cards for each <br />profile immediately following the EJ card. Table 3 illustrates the <br />organization of data for a typical multiple profile run. <br /> <br />4. STACKED JOBS <br /> <br />Occasionally it is desirable to enter several jobs for computation <br />at the same time. This can be accomplished by removing the three blank <br />cards and the ER cards from all but the last job. The jobs can then be <br />stacked and entered for computation at the same time. <br /> <br />5. DOCUMENTATION CARDS: AC, C, Tl - T3 <br /> <br />These cards allow the user to document HEC-2 output to identify <br />such items as stream name, study location, discharge frequency, data <br />sources, or other pertinent information that will identify the unique <br />character of a particular HEC-2 application. <br /> <br />25 <br />