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<br />I <br /> <br />I <br /> <br />1 <br /> <br />I. N-VALUE SELECTION PROCEDURES <br /> <br />1 <br /> <br />The selection of n-values was made based on published reference material <br /> <br /> <br />and field inspections by a number of experienced hydraulic engineers. A par- <br /> <br /> <br />tial list of reference materials which were used is as follows: <br /> <br />1 <br /> <br />1 <br /> <br />I. Water Supply Paper 1949, "Roughness Characteristics of Natural Channels," <br />U.S. Geological Survey, 1967. <br /> <br />I <br /> <br />2. Ven T. Chow, "Open Channel Hydraulics," McGraw-Hill, \959. <br /> <br />1 <br /> <br />! <br /> <br />3. Brater and King, "Handbook of Hydraulics," McGraw-Hill, \976. <br /> <br />1 <br /> <br />4. Soil Conservation Service, '~ngineering Handbook - Hydraulics, Sec- <br />tion 5," U.S. Department of Agriculture. <br /> <br />I <br /> <br />Two field investigations of the study reach were made by engineers associ- <br />ated with the study as follows: <br /> <br />1 <br /> <br />I <br /> <br />I. August 27, 1979 - A. S. Andrews and D. R. Hogan / Water Resources <br />Consultants, Inc. <br /> <br />I <br /> <br />2. October 26, 1979 - D. R. Hogan and A. P. Sandvik / Water Resources <br /> <br />Consultants, Inc. <br /> <br />1 <br /> <br />The proper selection of n-values depends on a number of factors which require <br /> <br /> <br />sound engineering judgment on the part of the engineer. Table-\ provides a <br /> <br /> <br />description of the factors which exert the greatest influence on determining <br /> <br /> <br />the n-values. <br /> <br />I <br /> <br />.1 <br /> <br />-I <br /> <br />;1 <br />I <br />I <br /> <br />43 <br />