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<br />3-10 <br /> <br />To cause a holdout hydrograph to be developed at a structure site, <br />enter HOLDOUT in columns 11-17 of the JOB statement. The procedure <br />will not work with null structures. <br /> <br />~ <br /> <br />3.3.2.2 ECON option -- The SCS computer programs, ECON2 and URBl, <br />require percent chance versus discharge dat;.a.. A peak discharge data <br />file can be created by the TR-20 program with the ECON option. The <br />peak discharges can be related to runoff volumes and percent chance. <br />The ECON option is invoked by entering ECON in columns 21-25 of the <br />JOB statement. The user can select cross sections and structures that <br />are to be included in this data by placing a "1" in the SUM column <br />(71) of the output options on the standard control statements. The <br />SUMMARY option (Section 3.3.2.5) can also provide the peak discharge <br />data but at each cross section and structure. Peak discharges for <br />each alternate and each storm will be provided. Summary Tables 3 and <br />4 contain the peak discharge information prepared for the ECON option. <br /> <br />3.3.2.3 Print option -- The Print option field is columns 31-39 of <br />the JOB statement. The default option, called Noprint, provides a <br />reduced printing of output if the field is left blank. To obtain the <br />FULLPRINT option, enter FULLPRINT in the data field. <br /> <br />~ <br /> <br />The FULLPRINT option will generate .considerable output that can effec- <br />tively conceal pertinent data. However, Standard Control or other <br />input errors may be overlooked without checking the FULLPRINT data at <br />least once on every job. It is suggested that the first pass through <br />a watershed be made using FULLPRINT. The bulk of this output is the <br />step-by-step list of each Standard Control instruction warning messages <br />and some basic data printed as the operations are executed. This <br />detailed printout including multiple peaks is suppressed if the FULLPRINT <br />option is not specified unless individual options on the Standard <br />Control statements are on. All changes to tabular data and Executive <br />Control statements are printed as before with Noprint. Exceptions to <br />this are that requested hydrographs peaks and volumes (columns 61, 63 <br />and 67 in the Standard Control statements) will continue to be printed. <br />Summary Tables are not affected by the Print option. An example of <br />the default Noprint output is shown in Appendix B. Noprint can reduce <br /> <br />~. <br />