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Draft North & East Metro Groundwater Management Area Plan 2.18 <br /> For example, there are large differences between water elevations in some vulnerable water bodies and <br /> the heads in the underlying Prairie du Chien aquifer.These large water elevation differences indicate <br /> limited hydraulic connection at those locations, but they were not discerned from the hydrologic and <br /> geologic data used. <br /> Surface water runoff and outflow versus groundwater inflow and outflow were also not considered in <br /> the analysis. Lakes and wetlands that include groundwater as a significant source or natural outflow will <br /> be more sensitive to aquifer fluctuations. <br /> P45 <br />