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[Last revised - February 2, 2011]
Main page and documentation modified to describe required placement and registration of comdlg32.ocx for 64-bit versions of Windows. Thanks to Eloy Benito Reyes for bringing this up.
Minor bugs fixed:
WETINF is now forced to be > b/(b+1) and <= 0.999 as required by the Clapp-Hornberger algorithm.
Input solar radiation (SOLRAD) is now prevented from being larger than potential insolation (I0HDAY).
Cancel button. A cancel button has been added to parameter screens to ensure quitting without changes or lockup.
Help modified slightly in various places.
All BROOK90 versions through 3.3 and 4.3 used interpolated interlayer conductivities and potential gradients based on layer thickness in subroutine VERT. The original equations produced too little flow with a thick wet layer over a thin dry one. The fix attempted in Versions 3.3 and 4.2/4.3 reversed the problem and gave too little flow with a thin wet layer over a thick dry one. The solution seems to be to treat the interface as if it cannot "see" the thickness of a thick layer. So the equations now are:
KKMEANi = exp((ln(KKi) + ln(KKi+1)) / 2)
GRADi = (PSITi - PSITi+1) / RMIN(THICKi, THICKi+1)
Results do not differ among versions for simulations in which all layers have the same thickness. Differences are generally small unless both layer thickness and dryness differ greatly.
International awareness - comma as decimal. I have recoded parts of BROOK90 so it should now be internationally aware, responding properly to changing Windows-ControlPanel-RegionalSettings. The earlier incomplete test for a comma as decimal has been improved. Data files now may have either comma or period as the decimal point with space separators, or may be a .CSV file with period as decimal and comma as separator. Both saved and printed output will conform to the Windows RegionalSetting. However, parameter files must always include a comma separator after the parameter name and decimal periods, as in previous versions. (Thanks to Ute Assmann for raising this issue.)
Output-Append added. A new option "Append" has been added to the Output menu for each interval. This appends the current output to any existing file, whereas "Save" requires creation of a new file. "Append" asks whether the header line should be included or not.
Font selection. Omitted appearance of SelectPrinterFont window on startup when CourierNew 10 was not available. Initial font and size is thus the system default. The printer font is now only tested when a print is requested. (Thanks to Ute Assmann)
Minor errors fixed.
On page KPT-3 under FDPSIDW, the subscripts in the first equation should all be f, not x.
On page EVL-2, N in the MDE equation should be n (two places).
On page PET-11 in equation 34,
Lp/(Lp+Sp) in the first term should be replaced
by 1/F and (Lp+Sp) in the second term by
FLp, where F =
(Lp+Sp/2)/Lp. This arises from the
(unnecessary?) assumption that only half of Sp is distributed
proportionally to L' (and the other half is below the leaves in a "stem
space")
On page KPT-3 under SOILVAR, ψm should be ψ, and three lines higher AWATRZ should be AWAT.
On page WAT-3 under SRFLFR, the second paragaph should just say that BROOK90 effectively simulates the mean water budget and mean water content over the whole watershed.
On page WAT-4 in the SAFRAC paragraph, all QFF should be changed to QFFC.
On page SNO-3 in the middle, "resistances ra and rs" should be "resistances raa and ras"
Daily precip interval. A Precipitation Interval file with only one line per day is now acceptable. This allows a user to provide different sequences of daily precipitation as precip interval files without having to change the Data file.
Errors fixed. Some Help messages were not properly changed for Version 4; at least some of these are now corrected. A few cosmetic errors are fixed. ROOTDEN is now only saved to two decimal places, the same as it is displayed.
Versions 4.2/4.3 changed the K weighting but badly - see Version 4.4 above. They should be replaced by Version 4.4.
Finally I have upgraded from Visual Basic 3 (16-bit) to Visual Basic 6 (32-bit). BROOK90 Version 4.1 is a 32-bit compilation of the Visual Basic 3 Version 4.0a code. Version 4.1 will run under Windows 95/98/NT.This did not require ANY code changes!! It seems to run about twice as fast as Version 4.0a, especially when Run-time Graph is turned off.
Some bugs involving printing and cancelling printing have been fixed
Version 4.0 separates the single parameter file into six files (Location, Flow, Canopy, Soil, Fixed, and Initial) and facilitates batch processing using "Shortcut for Windows" software.
Catchment parameters are separated into Location parameters and Flow parameters. Root distribution has been separated from the Soil layers and included with Canopy parameters. Initial values are now all in one place. I chose to leave the Fixed Parameter file separate rather than to include those parameters in the other files. Fixed parameters are not checked for abnormal values. The default extension for data and parameter files is .TXT.
The phenology of RELLAI and RELSAI is included with Location parameters but also depends on Canopy type; this means that a separate Location Parameter file is needed for each cover type at a location.
QLAYER and ILAYER in Version 3 have been replaced by QDEPTH and IDEPTH in Version 4. This makes these parameters independent of the specification of soil layers.
QFPAR = 0 (<0.01) now gives a bucket model with no SRFL or BYFL when QDEPTH water is below field capacity and all excess becoming SRFL or BYFL when above field capacity. QFFC is not used.
The documentation uses z0g when it really means either 1) z0g , 2) CZS * HEIGHT, or 3) z0s. Similar confusion existing in the program has been fixed.
Visual Basic code has been considerably changed, hopefully for the better.
To facilitate batch processing, menus can be operated with Alt-characters and parameter screens have a Tab order. Shortcuts have been added to the menu for those who like Function keys
Menus are somewhat changed.
Output-Save becomes checked if output has been saved.
All printer output now has top and side margins.
The EVAL output screen has been changed so it can be saved.