                                                           File: RELEASE.TXT


                   WASP Model System Release Notes

            Center for Exposure Assessment Modeling (CEAM)
                 U.S. Environmental Protection Agency
               Office of Research and Development (ORD)
                  Environmental Research Laboratory
                       960 College Station Road
                     Athens, Georgia  30605-2720

                             706/546-3549



-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.14 and 4.15:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Summary:  Corrected problems discovered during in-house applications.  This
information should allow the user to determine whether these problems bugs
have an effect on previous simulations.
      
1)  The bacterial population parameter was not correctly indexed to the
    environmental time function that allows the user to vary population size
    in time and space.
 
2)  The biodegradation decay term was not calculated correctly when the user
    tried to allow the model to calculate the second order rate.

3)  Problem was corrected in the MASS balance table routines.  The kinetical
    mass balance flux was not converted to the appropriate unit.
 
4)  The non-point source linkage routines to the Pesticide Root Zone Model
    (PRZM) were re-installed.  This will allow the user to use the PRZM model
    to provide runoff and erosion loads to WASP.
 
5)  Converted W4DSPLY program file format to direct access, unformatted file.
    This improves run time performance.  Added error checking to correct
    problems with arrays going out of bounds.   
      
-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.15 and 4.20:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected problem with Time Functions not properly initializing in
    subroutine TINIT.

2)  Corrected logic problem in specifying loads and boundary conditions.
    These errors occurred when a user specified loads and boundaries for 1
    system and did not enter information for the remaining systems being
    simulated.

3)  Rewrote WASP4 hydrodynamic linkage routines.  Refer to UPDATE.TXT file
    for more details.

4)  Made several corrections to EQUIVALENCE statements in the Toxic Chemical
    Model (TOXI).

5)  Converted simulation dump file back to a formatted file.

6)  Replaced the reaeration routines of EUTRO4 with those described by
    O'Connor (1983).  Refer to encode documentation for reference.  Refer to
    file UPDATE.TXT for changes in model input requirements.

7)  Corrected problems when user specified number of environmental time
    functions instead of all.  User should be able to specify only the time
    functions needed for selected study.

8)  Corrected the DMULT default depths where the other terms of the aQ to the
    b function was not defined.

9)  Performed thorough testing of DYNHYD.  Removed many inconsistencies.
     
-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.20 and 4.21:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected problem with volatization rate calculations.  This effects
    weakly volatile (gas phase limited) chemicals in lakes.

2)  Corrected an error in the light switch options for the eutrophication
    model.  In version 4.20 there was no way to invoke the Dick Smith light
    option.

3)  The DYNHYD model was re-dimensioned to handle 200 junctions and 200
    channels.

4)  Corrected problem with use of the volatilization to reaeration rate ratio.

5)  Corrected problem with time zero dump conditions not matching initial
    conditions.

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.21 and 4.22:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected problem with reaeration coefficient being applied to subsurface
    segments.  This was caused by not reinitializing the KA variable after
    use.  This problem only exists in the eutrophication model, EUTRO4.

2)  Corrected problem in DYNHYD concerning the variable inflow option.  The
    time function was being interpreted incorrectly when more than one time
    function was specified in the input file.

3)  The problem with W4DSPLY not running from any drive other than drive C:
    has been corrected.  WASP will not run on any logical drive.

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.22 and 4.30:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     
1)  The primary difference between 4.22 to 4.30 are cosmetic; no significant
    errors have been found.  Refer to file UPDATE.TXT for enhancements made
    to the model.

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.30 and 4.31:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected problem with DYNHYD creating a hydrodynamic linkage file.

2)  Corrected miscalculations of the bed sediment routines when more than one
    solid type is considered.

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.31 and 4.32:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected problem with temperature corrected SOD (SODTA parameter) from
    being over written by RLIGHTS in the EUTRO4 program.

2)  Added several time functions and segment parameters for the EUTRO4
    program.  Refer to file UPDATE.TXT for implementation notes.

3)  Redesigned the post processing programs to work from one menu.  There is
    only one post processor selection.

    If you discover any errors or inconsistencies with WASP 4.32 or
    DYNHYD 5.11, please contact: 

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 4.32 and 5.00:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Corrected source code errors detected during static code evaluation as
    per CEAM SDLCM.  Updated output file FORMAT statements to print current
    CEAM address, telephone number, and technical support staff.

2)  Corrected all REAL number comparison logic and statement structure.  Added
    subroutine INIT and COMMON definition include file CONST.INC to calculate
    REAL number and DOUBLE precision comparison base values.

3)  Revised and updated the following documents to CEAM standards:  READ.ME,
    UPDATE.TXT, RELEASE.TXT.

4)  Updated run-time status message files DYNMES.DAT and MESSFILE.DAT.

5)  Implemented CEAM standard installation INSTALIT/MediaBuilder code and
    logic.  Replaced W4INSTAL.EXE with compressed, self-extracting,
    interactive installation program with on-line, context sensitive help.
    Replaced external diskette labels as per CEAM SDLCM.

6)  Replaced previous user's manual file (WASP.DOC) with latest release of
    user's manual (USERMANA.DOC, USERMANB.DOC).  All *.DOC files are
    WordPerfect documents.

7)  Replaced TOXI4 and EUTRO4 executable task image files (TOXI4.EXE,
    EUTRO4.EXE) with 32-bit, protected mode files built with Lahey FORTRAN,
    F77L-EM/32 version 5.01 and Phar Lap 386LINK version 4.1L (CEAM standard
    FORTRAN distribution tools).  DOS extender is bound into application EXE
    files with automatic virtual memory management; distributed royalty free.
    No overlay structure--both linked as flat memory model.  Both EXE files
    now require 386/486 based system with co-processor.

8)  Released new version of DYNHYD model pre-processor program, PREDYN.

9)  Released new version of WASP display program W5DSPLY.

10) Corrected the temperature correction algorithm for ionization.

11) Provided for increased detection of user input errors.

12) Corrected Dick Smith light formulation to adjust the carbon-chlorophyll
    ration based on the average light in a segment, not the maximum.

13) Added default values for selected eutrophication constants.

-----------------------------------------------------------------------------

Corrections and Changes Between Versions 5.00 and 5.10:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1)  Resumed use of previous release of DYNHYD model pre-processor program,
    PREDYN.

2)  Released new versions of WASP TOXI, EUTRO, DYNHYD, and display program
    W5DSPLY.  Released new version of WASP Interactive Support Program
    (WISP).

3)  Improved WASP error-reporting capabilities.

4)  Default values for IFIELD(ISYS) have been added if the user-supplied 
    values are not in the proper range (3-5).

5)  Corrected names and units in EUTRO5 display variables.

6)  The Dick Smith light routine now passes values of light and calculated 
    saturating light intensity to the EUTRO5 display routine.

7)  Corrected calculation of the dynamic viscosity of air in TOXI5 subroutine
    VOLAT.  The error in previous versions affected the calculation of
    volatilization rates from stagnant water using options 4 or 5.  The
    result was to overpredict the air phase conductivity, and thus the
    volatilization rates for highly volatile chemicals.

8)  Added minimum default value for Henry's Law Constant (H) to prevent
    errors when user chooses to calculate volatilization without providing H
    or vapor pressure and solubility.

9)  Corrected typographical errors in DYNHYD5 output messages.

10) Added DYNHYD5 user manual as a WordPerfect document.

11) Added references to the WASP5 documentation and corrected typographical
    errors.

12) Added new test data files for DYNHYD5 (TOXRIVQ.INP, CANAL_H.INP) and for 
    TOXI5 (TOXRIV2.INP).  The latter links with the hydrodynamic file
    produced by TOXRIVQ.INP.

13) Daily loads read from the external nonpoint source load file (*.nps) are
    now applied over a single model time step at the beginning of a new day.
    In earlier versions, these loads were applied over the entire day.
