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<br />3-16 <br /> <br />reach routing through reach 2. Thus, the routing sequence can be directed <br />from one reach to the next. The SAVMOV 5 and DIVERT 6 statements will be <br />explained in sections 3.6.6 and 3.6.7. <br /> <br />The "xsection/structure" heading (Columns l3 thru 18, page A~5) contains <br />blank spaces that are to be filled in with either the cross section <br />number or the structure number. A cross section and structure number <br />must never both be used on the same line. Leading zeros do not need to be <br />inserted in the number field. The largest numbers that can be expressed for <br />any structure or cross section are 99 and 200, respectively. The smallest <br />number, in either case, is 1. Ways in which cross section/structure numbers <br />are associated with the statements in TR-20 are given in Table 3-4. <br /> <br />The "Hydrograph Number" heading (Columns 19 through 24) provides spaces in <br />which a hydro graph storage location is designated by numbers 1 through 7. <br />Up to three hydrograph storage location numbers are specified on each <br />Standard Control operation in these columns. One or two of the hydro graphs <br />may be required to be available to perform the Standard Control operation <br />and the third hydrograph storage number to save the resultant operation <br />hydrograph. DIVERT is different in that it has one source hydrograph and <br />two resultant hydrographs. All seven storage locations are similar and <br />may be used inter-changeably for input and output hydro graphs of any <br />operation. However, in order to keep track of hydrographs and assist in <br />error detection the user should standardize storage locations by selecting <br />three locations for the "operating" hydrograph storages. The user might <br />generally use locations 5, 6, and 7 as the "operating" storage locations. <br />For example, 6 ADDHYD 4 5 6 7 would take the hydrographs in locations 5 <br />and 6, add them, and place the resulting hydrograph in location 7. <br />i'-\'~';"" /....~ ',"'.~ -"--r \". t'.; ,'. <br /> <br />, <br />! <br /> <br />The cardinal rule to remember is that only one hydrograph can occupy <br />anyone storage location at a time and that there must be a hydrograph <br />in the storage location from which an operation is "calling it up." A <br />hydrograph remains in a storage location ready for use until new data <br />is placed into that location. It is recommended ~hat all storage <br />locations be checked for compliance with these rules before field <br />input data ,are submitted for data entry. The same storage location <br />must not be used in the input and the output for a single operation. <br />For example, 6 ADDHYD 4 7 2 7 should be 6 ADDHYD 4 7 2 5. <br /> <br />ce <br /> <br />C. <br /> <br />~ <br />