More Groundwater

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 1940s 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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More Groundwater - Permeability Range Greater than 1...

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