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<br /> <br />. of the accuracy of the regression coefficients, <br />. d better estimates of the model error than did <br />, 1IIlY.least-squares procedures. Also, Tasker and <br />(1986) showed that generalized-least-squares <br />ures provided a smaller average variance of pre- <br />than ordinary-least-squares procedures for the <br />anal 100-year flood for streams in Pima County, <br /> <br /> <br />Arizona. Several of the Stale reports described in this <br />documentation are based on generalized or weighted- <br />least-squares regression. The estimation of T-year <br />flood-peak discharges at gaging stations is still accom- <br />plished througb tbe use of Bulletin 17B procedures <br />(Interagency Advisory Committee on Water Data, <br />1982). <br /> <br />HISTORY AND OVERVIEW OF flOOD REGlONAUZAnON METHODS 5 <br />