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<br />Synthetic Unit Hydrograph <br />A unit hydrograph is a hydrograph representing 1 inch of runoff <br />from a given basin. The desirable method of determining a unit graph <br />for a basin is from a recorded flood event with runoff approaching 1 <br />inch or more. However, in most instances, these data are not avail- <br />able; therefore, a "synthetic" unit hydrograph based on an empirical <br />relationship (See Snyder's Constants) is used. <br /> <br />. <br /> <br />Weibull Plotting Position <br />A procedure for determining the relative frequency of each flood <br />event recorded during a given period of record. <br /> <br />wac Frequency Analysis <br />A statistical analysis of a streamflow record based on the proce- <br />dures outlined in the Water Resources Council publication Bulletin No. <br />17. <br /> <br />A-6 <br /> <br />. <br />