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<br />2-4 <br /> <br />the maximum inflow hydrograph peak coordinate and volume. The user <br />must provide either a cross section rating curve (Q vs. A, where Q = <br />discharge and A = cross sectional area) or the "x" and "m" values <br />wh~ch describe a rating curve (Q = xAm, where A = SILl. See Appendix <br />G & H. <br /> <br />~ <br /> <br />2.2 PROGRAM ORGANIZATION <br /> <br />A brief description of the functions of the program and of some of its <br />characteristics will help to better understand the organization of the <br />program operations and the instructions for the preparation of input <br />data sheets. A simplified processing sequence for TR-20 is given in <br />Figure 2-1. It shows the sequence in which the various major functions <br />are performed. Data described on the input data sheets are entered at <br />a computer terminal or punched onto computer cards. Input data can be <br />tabular data (structure data; stream cross section data, cumulative <br />rainfall data, and dimensionless hydrograph data), Standard Control <br />data, and Executive Control data. Briefly, the Standard Control data <br />is used to describe the physical watershed conditions and the Executive <br />Control data is used to describe the meteorological conditions and to <br />control processing. <br /> <br />C. <br /> <br />2.3 CAPABILITIES AND LIMITATIONS <br /> <br />Anyone TR-20 job can: <br /> <br />1. Route through up to 99 structures and an unlimited number of <br />variations for each structure. <br /> <br />2. Route through up to 200 stream reaches and an unlimited <br />number of channel modifications for each reach. <br /> <br />3. Compute up to 300 coordinates of a hydrograph at selected <br />points in a watershed and print out the discharge and elevation for <br />each coordinate. <br /> <br />~ <br />