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<br />b. Special Notes. Special notes are printed at various locations in the <br />output to inform the user of various assumptions or options that have been <br />used during the computation. These notes are summarized in exhibit 7. <br /> <br />c. S~~ary Data. When several jobs use the same cross section data <br />(NPROF is equal to or greater than 2), summary data is printed to aid in <br />comparing differences. Also differences between the water surface elevations <br />are printed out to facilitate checking the answers. Negative differences <br />point out trouble areas where the discharges are in increasing order. <br /> <br />d. Tapes. Normal output is on the printer. Additional output for the <br />cross section plot is from tape 7. <br /> <br />7. EXA!1PLE PROBL&'1S <br /> <br />Listings of input and output data for several example problems are shown as <br />exhibit 8. <br /> <br />8. UNITS <br /> <br />Hater surface profiles may be computed using either the English or Metric <br />system. English units are feet, square feet and cubic feet per second (cfs), <br />where as the "Ietric system calls for meters, square meters, and cubic meters <br />per second (cms). The only constants changed in the program are the constant <br />in Manning's formula and the gravitational acceleration. Coefficients for <br />computing losses through bridges and transition~/~re dimensionless. The only <br />exception is in the weir flow equation, Q = CLH . The discharge coefficient <br />"c" is a function of the square root of the gravitational acceleration. Since <br />"C" is read as variable COFQ on card SB it may be input as a metric coefficient. <br />In English units "c" ranges from 2.5 to 3.1. For Metric units a comparable range <br />would be 1.39 to 1.72. Table 1 below summarizes the conversion used between <br />English and Metric units. <br /> <br />TABLE 1 <br /> <br />ITEM <br /> <br />ENGLISH <br /> <br />3.28 feet <br />10.76 square feet <br />1 acre <br />35.31 cubic ft/sec <br />1.49 <br />32.2 ft/sec2 <br />2.5 to 3.1 <br />.1 to .3 <br />.3 to .5 <br /> <br />METRIC <br /> <br />Flow Conversion <br />Manning's Constant <br />Gravitational Acceleration (g) <br />Coefficient "c" in Weir Formula <br />Coefficient of Contraction <br />Coefficient of Expansion <br /> <br />1 meter <br />1 square meter <br />4046.86 square meter <br />1 cubic meter/second <br />1.00 2 <br />9.82 m/sec <br />1. 39 to 1. 72 <br />.1 to .3 <br />.3 to .5 <br /> <br />Length Conversion <br />Area Conversion <br /> <br />16 <br />