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You are browsing the archive for July 2013 - Terra Central.

31 July 2013

The Ins and Outs of Fracking and Underground Waste Injection Wells

When the Akron Beacon-Journal Online publishes its updated interactive map of active, permitted, and producing oil and gas wells in Ohio, it places another map right below it. The second map shows underground waste injection wells. These two maps belong together because underground injection wells are used to dispose of the polluted flowback water from high volume hydraulic fracturing (fracking) operations. When thinking about potential for groundwater contamination, hydrofractured oil/gas …

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1 July 2013

Soil Anisotropy: Mechanisms and Hydrologic Consequences

Introduction Anisotropy, which is the opposite of “isotropy,” is a term used to denote preferential flow direction in soils and other geologic materials. If soil consisted of perfectly spherical grains, flow rates would be isotropic – the same in all directions, other factors being equal. Soil doesn’t consist of perfectly spherical grains, however. It’s commonly understood that flow of air and water through soils is greatly influenced by grain size, …

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