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<br />51 <br /> <br />. <br /> <br />Up to 50 points per cross-section may be entered on a group <br /> <br />of type 2 cards. Points may be altered as desired. <br /> <br />3) Card Type (3) specifies roughness data. For assignment of <br />roughness values, the channel is divided horizontally into three <br />sections. The lower horizontal dividing line is at elevation B <br /> <br />f~om the lowest streambed elevation. All parts of the channel <br /> <br />below elevation B are assigned a roughness of Nl. The upper <br /> <br />horizontal line is at elevation A from the lowest st~eam bed ele- <br /> <br />vation. All parts of the channel above elevation A are assigned <br />a roughness of N2. All points in between elevations A and B have <br /> <br />a roughness computed by a linear proportioning of roughnesses N2 <br /> <br />and Nl. Card 3 data entry is as follows: <br />Columns 4-8: Nl (F5.3) <br />Columns 9-13: N2 (F5.3) <br />Columns 14-18: B (ft) (FS.l) <br />Columns 19-23: A (ft) (F5.1) <br />Column 71: QCHECK (indicates type 4 card follows) <br />Column 80: Card Type = 3 <br />Roughness cards are needed only at the initial section and only <br />thereafter where roughness changes in value or in elevation above <br />the lowest point in the st~eam bed. Any nonzero number in <br />Column 71 indicates a stage-discharge card follows. <br />4) Card Type (4) specifies initial discharge-elevation conditions. <br />One card is provided for each discharge and its corresponding <br />starting elevation. A maximum of ten discharges may be included. <br />Card 4 data entry is as follows: <br /> <br />Columns 4-13: Discharge (cfs) (FlO.2) <br /> <br />. <br /> <br />-~ <br /> <br />. <br /> <br />. <br /> <br />. <br />