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<br /> .- <br /> ELECTRONIC COMPUTER PROGRAM A.STltACT <br />TIT""'!! 0' p.-QGfIlAM 'PROG"AWI NO. <br />Regional Frequency Computation __~1~?3~~~-L 7 ~5_0_ ---~ <br />~"E~A"'NG AGUCY The Hydrologic Engineering Center, U.S. Army Corps of Engineers <br /> hCl0 c. " . 'r2H ' Ql;hH; ____.__.._..... <br />AUTH"".., u~, .u STATUS 0" ...ROGJIt..... <br />Leo R. Beard July 1967 ;;;;;-.---i~.- -- <br />Harold E. Kubik Rev. July 1972 Init. i Op. <br />A.:, pu"ptOlI: 0" ""00""" of annual <br />The purpose of this program is to perform frequency computations max- <br />imum hydrologic events necessary to a regional frequency study. Frequency <br />statistics are computed for recorded events at each station and for each dura- <br />tion. Missing events are computed so that complete sets of events are obtained <br />for all years at all stations while preserving all intercorre1ations. <br />.. PfIlOOflAIlI ....ClF.CATION' <br />The program is dimensioned for a maximum of 10 stations. but more stations can <br />be interrelated by saving key stations from previous runs. The number of dura- <br />tions times the number of years cannot exceed 400. but the number of durations <br />cannot exceed 8. <br /> .--- <br />C. ''''THOOI The mean. standard deviation. and skew coefficients of the logarithms <br />are computed for each station and each duration. An approximate Pearson <br />Type III distribution is assumed. Missing events are computed by a regression <br />equation which includes a random component whose influence is proportional to <br />the unexplained error. The flows are then arranged in order of magnitude and <br />tabulated with median plotting positions. Statistics are then adjusted. <br />standard deviation may be smoothed and regional skew may be specified. and <br />frequency curves computed. <br />o. IlQUIP...NT onAILa <br />Tnis program requires a FORTRAN IV compiler and about 32K words of storage <br />on the CDC 6600 and Univac 1108. The program can be used on machines of <br />the IBM 70~4 class by reducing the number of stations. <br />E. 'N",T- OUT"UT I <br />Card input is Tape 5 and printout is Tape 6. Statistics and recorded and <br />reconstituted flows and adopted statistics can be output on Tape 7 which <br />allows card output. <br />,.. ADDITIOMAL "...",,1(1 <br />Double precision is recommended when using the IBM 360 series computers. <br />A plotting routine has recently been added to plot the frequency curves on <br />the printer. <br /> <br />DIG PORIl <br />1 AUG 60 <br /> <br />2BB3 <br /> <br />P'...VIOUI .DITtON' A". O..OLltTI[. <br /> <br />20 <br />