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tf t( . TECHNICAL RELEASE 20 COMPUTER PROGRAM FOR PROJECT FORMULATION HYDROLOGY CHAPTER 3. INPUT PREPARATION 3.1 MINIMUM DATA REQUIREMENTS TR-20 can handle complex as well as very simple problems such as developing the hydrograph for one watershed. A simple problem can be done with as few as ten statements, including data. Complex problems can require many pages of input data. An example of the required input data for a small watershed is summarized in Table 3-1. 3.2 INPUT REQUIREMENTS AND FORMS A blank form for listing each type of input data is included in Ap- pendix F. Each line of data on the form is a record to be entered at a computer terminal or on a single computer card. The 80 columns across the top of the form represent the 80 positions on a record. Each statement is used to perform a specific operation. The ordering of the records determines the sequence in which the operations are to be performed. There can be up to 600 Standard Control statements (records or cards) for each TR-20 job. The "Data Code" heading (Input forms, Appendix F, Column 2), indicates the type of data on that line. For example, "8" signifies that the line contains tabular data. The data code is a required entry and is preprinted on most of the forms. A name appears in Columns 4 through 9 of all lines except those containing tabular data. These names identify for the user the type of operation performed or type of data entered. The digit in column 11 is the operation number and identifies the type of operat~on. It must be entered unless it is a blank. The rest of the entry on each line is described in the following sections.