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<br />CI: Optional Channel Improvement Card. This optional card allows <br />a user to simulate the improvement of channels by excavation. Invert <br />elevations, side slopes, 'n' values and bottom widths may be specified <br />by this option. Up to five different bottom widths may be specified <br />for analysis during the execution of a multiple profile run. <br /> <br />8. CROSS SECTION CARDS: Xl - X5 & GR <br /> <br />These cards are the basic data that describe the Qeometric properties <br />of a stream. Each set of Xl through X5 and GR cards defines a single stream <br />cross section. Xl and GR are required cards that provide the basic <br />geometric representation for a reach of stream. X2 through X5 cards pro- <br />vide a series of options related to bridges, effective flow areas, addi- <br />tional geometric data, and high water elevations. <br /> <br />Xl: Required Cross Section Card. An Xl card is required to input <br />data for each cross section. Values on the Xl indicate the number of <br />GR data points to be read on the following GR cards and locate the cross <br />section by indicating the distance to the immediate downstream cross <br />section. Other values input on the Xl card locate the bank stations, <br />raise or lower elevations on the GR cards, allow skewing (expansion or <br />contraction of the GR data, and request a line printer plot of the <br />cross section data. <br /> <br />X2: Optional Cross Section Card. This card provides an array of <br />options related to discharge, bridges, program traces, and the calculation <br />of Manning's 'n'. An X2 card is required for each application of the <br />special bridge option. <br /> <br />X3: Optional Cross Section Card. The X3 card provides various <br />options to remove portions of the GR data from flow calculations. The <br />removed or blocked out areas are referred to as ineffective flow areas. <br />The X3 card allows the specification of such ineffective flow areas as: <br />areas behind levees prior to overtopping; areas below a specified sediment <br />elevation; filled areas; and areas behind specified encroachment stations. <br /> <br />X4: Optional Cross Section Card. This card allows additional <br />ground points to be added to the elevation station data contained on <br />the GR cards. This option is useful when modifying GR data repeated <br />from the previous cross section or when the effects of proposed obstruc- <br />tions such as levees, piers or buildings is to be examined. <br /> <br />X5: Optional Cross Section Card. This card is used to input <br />water surface elevations at a cross section. Elevations or increments <br />of elevation to be added to the water surface elevation of the previous <br />cross section may be specified. The elevation specified for a particular <br />profile corresponds with the field of the QT card selected by the Jl <br />card. <br /> <br />GR: Ground Profile Card. This card inputs data that represents a <br />profile of a stream taken perpendicular to the direction of flow. Up <br />to one hundred pairs of elevation-station data may be utilized to describe <br />the ground profile. <br /> <br />28 <br />