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Special Installation instructions for Vista SP1 and SP2

Problem: Program gives

Set Permissions

1. Login in with Administrator access
2. Double click "WWHM4 Files" (desktop icon)
3. Right click C:\ProgramData\WWHM4
4. Select Properties
5. Select Security tab
6. Click Edit to change permissions
7. Select 'Users' Group
8. Check 'Full control'
9. Click 'Ok' twice
10. All users should now be able to use WWHM4

If you are not installing WWHM4 then
substitute BAHM, SDHM, etc for WWHM4.

WWHM3 File Types: What are they?

There are 3 project file types that are produced by the WWHM3: .WHM, .WDM, and .WH2. The WHM and WH2 files contain your project information, and the WDM file contains the time series data produced or used by your project.
When you save a project, you are saving 3 files:
This is the binary project file which contains all of the information about your project except the time series data (flow, evaporation, precipitation, stage data contained in the WDM file). It loads very quickly and its size can vary depending on the size and complexity of your project. A medium sized project WHM file can be 12 megabytes or more.
This is functionally identical to the WHM file except that it is much smaller and takes longer to load. It is a text file with the project information which must be parsed and translated into binary information. A 12 megabyte WHM project file can be loaded as a WH2 file of less than 300 k. However this might take several minutes to load.
The vastly smaller size of the WH2 file makes it the ideal choice when emailing a project to someone. It takes longer to load, but once it is loaded, the user can save the project, automatically producing a WHM which is then loaded very quickly --so the long loading time only needs to happen once.
Another advantage of the WH2 file is forward compatibility with respect to WWHM releases. Sometimes when the WWHM core code is updated, previously saved WHM files become incompatible with the latest version of the software. The WH2 file bridges this gap and assures forward compatibility.
If the WWHM3 detects an incompatible WHM file, it will find the WH2 file and load it instead. Once loaded it will then be saved in the latest format. This process happens behind the scenes and the end user shouldn't even notice it's happening. You can be sure that your saved project will still load in future releases of the WWHM3.
This is the Watershed Database Management file containing all of the data, including precipitation, evaporation, stage, and flow time series (in some cases irrigation, water quality and other kinds of time series are stored in there as well).
If the WWHM3 loads a project and can't find the WDM file that goes with it, it will prompt the user and create a new WDM with the proper precipitation and evaporation data for the project. All flow or stage data produced by the project will have to be produced again by re-running the project.
Normal saving and loading of a project is done locally with the WHM file format. When sending projects via the internet, the WH2 file can be send by itself and the project will be re-constructed automatically on the other end. Most of the time, the user never has to worry about anything but saving and loading the WHM file. WWHM3 takes care of the rest.

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Olympia, WA 98501
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