WWHM3 gives the user greater modeling flexibility and options. Version
2 was limited to drainages of less than half a square mile (320 acres)
because of the lack of a conveyance feature (natural channel or pipe). This
limitation does not apply to WWHM3; with Version 3 the user can model
entire watersheds of unlimited size as long as they are contained
within a single county or use the time series element to transfer flows from one county to an adjacent county.
Specific changes and additions in Version 3 include:
There are three GIS Import-related files:
Import basin and open channel data from a comma delimited tables created from ARC shape (.SHP) files to make a WWHM3 model.