The purpose of this set of optional screens is to identify where and when future disturbances are expected to occur. This information is combined with the susceptibility data to predict weed spread (some vegetation types are susceptible to weed invasions only following a disturbance). If the user does not include the disturbance layer, the solver will assume by default that the whole study area is disturbed for the entire planning horizon.
The first screen displayed is used to access previously entered disturbance data using alternative methods:
If a Disturbance Layer was specified by any of the available methods in the previous screen, the Disturbance: Define Disturbed Areas screen is displayed:
This screen is used to specify the location and years when an expected future disturbance affects susceptibility of weed spread. These locations and years of susceptibility due to disturbance are identified by 'X'.