Lecture 16 Recharge and Flow

Lecture 16 Recharge and Flow - Aquifer Recharge, Lakes, and...

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Aquifer Recharge, Lakes, and Springs
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The Florida Platform was dominated by marine carbonate deposition between 150 and 24 mya The most recently deposited carbonates from the Oligocene and the Eocene between 55 and 24 Mya comprise the principal water bearing unit of the Floridan aquifer. Silicon-based (siliciclastic) Miocene sediments from the continent, principally the Appalachians, settled over the carbonates beginning 24 million years ago forming the upper confining unit for the aquifer Sandier sediments subsequently covered the Miocene deposits
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55 – 24 million years ago Miocene Clays (low permeability) Surface Siliciclastics (sandy) (highly permeable) The Floridan aquifer is a confined aquifer. The water-bearing unit is permeable limestone. Low Permeability Confining Unit (poor water movement) Unconfined aquifer is extensive throughout the state of Florida Low permeability rock (confining) Rudimentary Picture Low permeability rock Source of permeability
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CaCO3 + H+ = H CO3- + Ca2+ Acidity from rainfall reacts with CaCO3 and dissolves the carbonate rock. (solid) (solution ) (acid) (solution ) CO2 + H2O = H2CO3 H2CO3 => H+ + HCO3- Dissolution Cave
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Caves and Solution Cavities Acid dissolves calcium carbonate CaCO3 + H+ = HCO3- + Ca2+ Hold and deliver billions of gallons of fresh water
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Characterized 
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This note was uploaded on 07/31/2011 for the course SOS 2007 taught by Professor Dr.jamesbonczek during the Summer '07 term at University of Florida.

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Lecture 16 Recharge and Flow - Aquifer Recharge, Lakes, and...

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