What does “Treat as far-field” mean on the Linesink String Properties dialog?
The area of interest in your model must be surrounded by surface water features (line-sinks) that define the “far-field” hydrology in the model. These line-sinks on the perimeter of your model area perform a similar function as the conditions specified on the perimeter of a finite difference grid. Line-sinks in the far-field receive water or infiltrate water based on arbitrary conditions outside the model domain. Consequently, these line-sinks do not realistically represent surface water and groundwater interactions and should not be given a bottom resistance, width and depth parameter. Instead, they should simply maintain the specified head, regardless of the amount of water that must be extracted or infiltrated. By checking the box “Treat as”far-field” on the linesink dialog box all fields, except for the heads, are disabled. In summary, all line-sinks on the outside of the model domain must be checked as “Treat as “far-field””. For further reading on the matter see “Analytic Element
