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APPENDIX A -- INSTAllATION OF THE COMPUTER PROGRAM The National Flood Frequency (NFF) computer program, contained on the diskette included with this report, can be run on a variety of personal computers (PC), It is desirable to have a VGA color monitor, DOS 4.0 or later, and at least 640K bytes of memory. NFF can be run under Microsoft Windows 3X, but it is not a Windows application, NFF can be used on a PC with a monochrome or text only monitor but it may not be possible to display all the graphics. Some dif- ficulty displaying graphics has been experienced using pc's with LCD displays, such as laptops. Since NFF presents its results in tabular fonn and optionally as graphics, the lack of ability to produce graphics does not severely limit effective use of the program, The following files are on the diskette: nff.exe nff.ico nff.pif open,bmp state. bin state.ndx readme,text executable nff program raging flood icon for nff (use icon with pif file) Windows 3,X pif file for nff opening screen bitmap packed state data file index into the state data file introductory information about off NFF can be run directly from the provided diskette, however, it will run significantly faster if it is installed on your hard disk (if available) and run from there, Perfonn the following steps to install and run NFF on your hard disk: I, Make sure the distribution diskette is write protected, 2, Create a directory to contain the NFF files, for example, mkdir c:lnff 3. Copy the NFF files from the distribution diskette to your hard disk, for example, copy a:*,* c:\nff 4. Change your working directory to the NFF installation directory, for example, cd c:lnff 5, Execute the NFF program by typing the command "off." The following options may be chosen when running NFF: -h display a short help message -t skip display of the initial NFF screen -s avoid the typing of unnecessary <return> keys logftle a valid OOS filename to which NFF non-graphical output can be saved (as well as displayed on the screen). Saving this infonnation to the logftle is a convenient way to docmentthe input data used to compute a given flood-frequency curve or flood hydrograph. An example of a NFF logftle is given in Appendix B. Options may be used in combination as long as logftle is specified last, for example, "nff -stlogftle". There are a few special key strokes that simplify use of NFF. The following is a brief description of these key strokes. ^A abort and restart the current major activity, ^B abort the current major activity and restart the pre- vious major activity. ^C exit NFF completely. (Note: "^A" means hold down the Control (Ctrl on many keyboards) key and press the letter A key.) Use of ^A and ^B allows the user to go backwards in NFF to correct a mistake without having to restart the program. Use of ^C allows the user to exit NFF at anytime. The definition of a "major activity" is somewhat arbitrary, but roughly corresponds to each of these tasks: (a) selecting a state for analysis; (b) entering input data for a flood-fre- quency computation; (c) making plots; and (d) computing flood hydrographs. NFF tries to use the highest display resolution thaI your video driver supports, Display problems may be experienced in the initial screen if the graphics of your monitor does not support the higher resolution modes of your video card. If this is a problem, a specific video mode can be specified for NFF graphics by setting the DOS environment variable named FG_DISPLAY to one of the following values: CGAHIRES IBM CGA in 640 X 200 X 2 colors CGAMEDRES IBM CGA in 320 X 200 X 4 colors EGAMONO IBM EGA in 640 X 350 X 4 colors, but monochrome monitor IBM EGA in 640 X 200 X 16 colors IBM EGA (enhanced) in 640 X 350 X 16 colors EGALOWRES IBM EGA in 320 X 200 X 16 colors EBGAHIRES Everex EVGA in 800 X 600 X 16 colors ORCHIDPROHIRES Orchid PraDesigner VGA in 800 X 600 X 16 colors Paradise VGA in 800 X 600 X 16 colors Toshiha 3100 in 640 X 400 X 2 colors (monochrome) Trident VGA in 800 X 600 X 16 colors Video 7 Vega VGA in 800 X 600 X 16 colors Vesa (mode o.6A) 800 X 600 X 16 colors Vesa (mode 0.102) 800 X 600 X 16 colors EGACOLOR EGAECD PARADlSEHIRES TOSHIBA TRIDENTHIRES VEGAVGAHIRES VESA6A VESA2 188 NltIonwlde Sum miry 01 U.S. Geologlcol Survey Reglonll R_elon Equlllon.lor Eollmlllng MIgnllude Ind Frequeney 01 FIoodo lor Unglged Snee, 1993