More Groundwater - Permeability Range • Greater than 1...

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More Groundwater 05/03/2008 14:31:00 Water Budget: Inputs: o Precipitation o Streams (in a losing stream) Outputs o Streams (Gaining stream) o Evapotranspiration o Pumping Stream flow: o Perennial o Intermittent o Ephemeral Groundwater storage and movement How much water will “fit” underground? o Porosity: The fraction of Rock/Sediment/soil that is “Open Space” o Pores: Air, Water, Oil, Gas o Permeability: The ease with which fluid moves through a porous  medium What controls it? Ex: Clay (Shale) = low permeability since small grains High Perm = large grains and/or fractures
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Unformatted text preview: Permeability Range • Greater than 1 centimeter/year to 1 km/year Aquifer and aquitard Aquifer - High porosity and permeability • Ex: Well-sorted Gravel Aquitard – Impedes the action of ground water (opposite) Low permeability • EX: Layer of Clay or Shale Ogallala Aquifer. • Largest aquifer system in the US • One of the largest in the world • Enough water to fill Lake Huron in this Aquifer • 1940’s to 1980, water level dropped almost 10’ per year 05/03/2008 14:31:00 ← 05/03/2008 14:31:00 ←...
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