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SECTION l: INTRODUCTION TO THE DODSON HYDRAULICS LIBRARY <br /> The previous section illustrates the appearance of the HELP MENU of the <br /> Trapezoidal Channel Analysis Program. The HELP MENU of each of the other <br /> programs is similar. <br /> 1.5 ENTERING DATA <br /> 1.5.1 Basic Data Entry <br /> All the procedures of the program receive data in the same way: by prompting <br /> you for the necessary data on the screen, one item at a time. The item is <br /> highlighted, and the cursor (the flashing bar) is located on the DEFAULT <br /> VALUE, which is the value which the program will use if you don't enter a new <br /> one to replace it. The values which you type in are used as Default Values if <br /> you repeat the operation without leaving the program. <br /> You can use the BackSpace key (on the top right of your keyboard) to erase any <br /> mistakes you make before you press the <Entey> key. You can also press the <br /> <Esc> key at any time to immediately return to the MAIN MENU. <br /> 1.5.2 Getting Help During Data Entry <br /> Instant help is available at all times during data entry. Pressing the <F1> <br /> key on the upper left corner of your keyboard will cause each of the <br /> HYDRAULICS LIBRARY programs to display a box containing guidance on entering <br /> the required data. The following section illustrates the "help window" which <br /> is displayed if you press <Fl> while entering the side slope for a trapezoidal <br /> channel. As shown, the "help window" provides a more detailed explanation of <br /> the required input data and lists range of allowable values for the input <br /> data. <br /> 1.5.3 Example of Data Entry "Help Window" <br /> Channel Side Slope (horizontal/vertical) <br /> Range of Allowable Values: 0 to 100 <br /> The slope of each side of the channel is expressed as the <br /> run divided by the rise. This is called the "Z-Ratio" . A <br /> channel with 3:1 side slopes would have a Z-Ratio of 3. <br /> The side of the channel rises 1 foot in each 3 feet of <br /> distance away from the channel bottom. For a rectangular <br /> channel, both side slopes are equal to zero. <br /> 1. 5.4 Range of Allowable Values <br /> The programs in the HYDRAULICS LIBRARY check each input data value to assure <br /> DODSON & ASSOCIATES , INC. THE DODSON HYDRAULICS LIBRARY, PAGE 5 <br />