Ayers, J. F. 1991. Well-Head Protection Areas, Lincoln Well Field, Ashland, Nebraska (OFR-47). 33 pp. + 1 over-sized map. Description: As part of an effort by the Lincoln Water System to develop and manage the groundwater resource near Ashland, Nebraska, a study was conducted to delineate well-head protection areas for the Lincoln well field. The study consisted of applying two numerical techniques aimed at defining capture zones for each production well.