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3-5 ~ 3.3 JOB CONTROL 3.3.1 Operating System Control Language The operating system control language necessary to initiate a TR-20 job varies with different computers. To assist users that may want to run TR-20 on various computers, file descriptions and specifications are given in Table 3-3. 3.3.2 JOB and TITLE Statements (Figures 3-1 and 3-2) ~. The input data begin with the JOB and one or two TITLE statements. The JOB statement and one TITLE statement are required for each job. The letters "JOB" in columns 1-3, is the only required entry in the JOB statement (Figure 3-1). There are seven additional fields that are optional in the JOB statement. These fields are for processing ~ - J.1 options. 1 Two TITLE statements (Figure 3-2) follow the JOB statement providing a~two line title that is printed at the top of each page of output. The word "TITLE" is the only required entry in these statements. If the user desires to number successive runs to facilitate keeping track of various runs or to maintain a file number system, a file number may be entered as a three-digit integer in columns 7-9 of the first TITLE statement. The titles are entered in columns 11-80. The processing options in the JOB statement and the TITLE statements remain in effect through all alternates and storms until reset by another JOB statement at the beginning of another TR-20 job. The JOB statement options are discussed in Section 3.3.3 through 3.3.8. . 3.3.2.1 HOLDOUT optioni-- Preliminary investigations in large watersheds may result in the identification of numerous floodwater retarding structure sites in tributary areas. Shortcut procedures are required to estimate the effect of the structures on the flow of the tributaries and main stem and for possible coordination with the evaluation of proposed flood control structures by others. The development and routing of holdout hydrographs can be a useful method to estimate the downstream effects.