The Nebraska controversy that resulted in TransCanada Corporation rerouting the Keystone XL pipeline around the Sandhills and away from the Ogallala Aquifer highlighted the risk the pipeline poses to groundwater (Read more about the Environmental risks of the Keystone XL pipeline).
To augment the KMP Google Earth view I have converted a USGS map of principal US aquifers (Source: National Atlas). Viewers will immediately notice the extraordinary size of the mid-West aquifers as compared to, say, Hawaii or the Rocky Mountains where the aquifers are much smaller.
View the Keystone Mapping Project and US aquifers in Google Earth:
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