Cross-sectional computer models were created that incorporated different high permeability zones to explore the potential role of eskers and similar geologic units associated with peatlands on the hydrology of these systems. These computer simulations indicate that small isolated lenses of high permeability material will locally distort the flow field, shifting flow patterns and creating new discharge and/ or recharge zones. The simulation with the greatest hydraulic connectivity between the peat dome and peatland lagg displays widespread and continuous-with-depth downward flow beneath the bog dome, consistent with field observations. These simulations were compared with field data collected from a Maine (USA) peatland, and they suggest an esker identified within this peatland distorts the hydraulic gradients and resulting flow patterns within the peat. Similar subsurface features may be important in other peatland systems.
