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• Sources: How should I define initial vertical and lateral dimensions for volume sources?
  Answer: When a volume source is chosen, the initial dimensions of the volume source plume must be determined.  The table below from "Screening Procedures for Estimating the ...
• General: How can I get results for different averaging periods?
  Answer: The Screen model only produces 1-hour average results (with the exception of 24-hour estimates for complex terrain impacts), however, scaling factors can be used to ...
• Receptors: Why do the automated a discrete distance options give different results at the same distance?
  Answer: Technically, the concentration should be the same at the same distances. However, you are likely seeing ...
• Sources: How can I model multiple sources?
  Answer: Stacks that emit the same pollutant with similar exit parameters and which are within about 100m of each other may be analyzed by treating all ...
• Meteorology: What is the anemometer height?
  Answer: The anemometer height is the height above the ground at which the wind speed is measured. The default value for the anemometer height is ...
• Terrain: What is the difference between "Complex" and "Complex + Simple" terrain?
  Answer: Complex terrain is any terrain that is located above the stack height or above the release height. Terrain below the release height is referred ...
• Meteorology: Which meteorology option should I use?
  Answer: In general, the Full Meteorology option should be chosen as it covers all possible scenarios and provides the most conservative estimate when running SCREEN3 . ...
• Terrain: What restrictions does the complex terrain option impose?
  Answer: There are two cases which users should be aware of: The Meteorology option (options in the Meteorology tab) is not available for Complex Terrain. ...
• General: Why do I need to specify a plot file along with my POST file?
  Answer: When you specify a POST file to generate percentiles from Percent View will ask for a plot file as well if the POST file is ...
• Installation: What rights do I need when installing any software from Lakes Environmental?
  Answer: Lakes Environmental software applications must be installed under FULL administrative rights.  Failure to do this may result in an unsuccessfully installation or issues running the software. ...

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