

The current understanding of the conceptual groundwater flow system (a combination of the hydrogeologic framework and how water moves into and out of the system) was developed for the FAS and adjacent systems based in part on previously published USGS Regional Aquifer-System Analysis studies ( Sun and others, 1997), specifically many of the potentiometric maps and the modeling efforts, and also the recent update to the hydrogeologic framework by Williams and Kuniansky (2015).įactors which influence circulation of groundwater within the system are the altitude of the recharge area and distance to and altitude of discharge areas degree of confinement changes in transmissivity within the FAS terrain, including uplands and lowlands or incision of streams karst areas with internal subsurface drainage groundwater withdrawals and presence of hydraulically connected saline groundwater.
