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<br /> - ~ <br /> ELECTROMIC COMPUTER PROGRAM ABSTRACT <br />TIT l,,1!: 0" PROGR..... PRoo" AM MO. <br />HEC-4 Monthly Streamflow Simulation 723-X6-L2340 <br />~",~ARING AGue., The HyClro 1 og1 c Eng1 neer1 ng \;enter, u.::.. Anny I.orps -oTEngfneers d <br /> 609 Second Street, Davis, California 9561_6____________ <br />AUTHOfO"" IDAn ~V" -~. .. I n ATVS 0,. JaHOGRAN <br />Leo R. Beard July 1967 '-HA.. --,_. - <br /> (T~Opt(. <br />Harold E. Kubi k Rev. January 1971 Init. <br />A. PU.."o.E 0' ~"OO"A" <br />This program will analyze monthly streamflows at a number of interrelated sta- <br />tions to detennine their statistical characteristics and will generate a <br />sequence of hypothetical streamflows of any desired length having those charac- <br />teristics. It will reconstitute missing streamflows on the basis of concurrent <br />flows observed at other locations. It will also use the generalized simulation <br />model for generating monthly streamflows at un gaged locations based on regional <br />studies. <br />B. ~"oa"A" .".CI"CATION' <br />The program is dimensioned for a maximum of 10 stations, but more stations can <br />be intercorrelated by multipass operations. Input is limited to 100 years of <br />monthly flows. Station numbers should be 3 digits or less (can be 4 digits by <br />cbanging input format) and generated values cannot exceed 999,999 units. <br />c. "CT HODI <br />The mean, standard deviation, and skew coefficients of the logarithms are com- <br />puted for each station and each month. Each flow is converted to a nonnalized <br />~.standard deviate using an approximation of the Pearson Type III distribution. . <br />Missing and generated values are computed by a multiple regression equation <br />!~~iCh includes a random component whose influence is proportional to the <br />unexplained error. The previous month is one of the independent variables so <br />as to preserve the serial correlation. <br />o. I!QUIN.NT DCTAILS <br />This program requires a FORTRAN IV compiler and about 60K words of storage <br />on the CDC 6600. The program can be used on machines of the IBM 7094 class I <br />by reducing the number of stations. <br /> I <br />~. IN",T' DUT"UT <br />Card input is Tape 5 and printout is Tape 6. Statistics and generated flows <br />can be output on Tape 7 which allows ca rd output. Tape 8 and Tape 9 are used <br />as scratch tapes. <br />,. "DDIT 10M AL ...MAllIK. <br />Double precision is reconrnended when using the IBM 360 series computers. <br /> <br />PIG PORM <br />1 AUG 6G <br /> <br />2883 <br /> <br />"."[VIOUI aDITION. AIIt. O.'OLItTI;. <br /> <br />18 <br />