  >> OPERATIONAL ESTIMATES OF AREAL EVAPOTRANSPIRATION & LAKE EVAPORATION <<

			    *** WREVAP PROGRAM ***

   =========================================================================



	Program WREVAP is a computer model for estimating actual

    evaporation and transpiration from routinely available records of

    temperature, humidity and sunshine duration.  WREVAP.FOR is the IBM.PC

    1.0 version of the program which uses R/M FORTRAN Version 2.43.

    WREVAP.EXE is the executable code of this program.



	This diskette also contains four data and four parameter files.

    SAMPLE1.DAT contains example of monthly data, SAMPLE2.DAT shows example

    of regular "five periods per month" data, SAMPLE3.DAT shows example

    data file with irregular data and finaly SAMPLE4.DAT is another

    illustration of monthly data but for the lake evaporation version of

    the model.



	SAMPLE1-4.PAR contains control parameters for the above data files.



	SAMPLE4.TGW  contains previous solar and water-borne energy

    inputs (see Record F).



	NHRI paper no. 24 describes design of data file for the mainframe

    version of the model.  The PC version uses slightly different data input.

    Input data are divided into the data and parameter file.  Parameter

    file can be created either using editor or interactively by the program

    itself.  Formats of parameter file are equiavalent to Record A,B, and C

    as described in paper no. 24.  PC version of data file contains only a

    site name on the first line.  Folowing records have the format decribed

    in paper no. 24 as Record D or Record E (depending on param INDEX).



	Before running the program you have to have your data file ready.

    The data file can be created using your usual text editor (please avoid

    using Tab keys!).





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