Aquifers: Porosity and Specific Yield

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Questions and Answers

What is specific yield in aquifers?

  • The thickness of the aquifer
  • The quantity of water yield released from the aquifer (correct)
  • The volume of voids in the aquifer
  • The area and thickness to store water in the aquifer

Which factor does NOT affect hydraulic conductivity?

  • Weathering
  • Median grain size
  • Specific yield (correct)
  • Sorting

What material has the highest porosity?

  • Gravel
  • Sand
  • Clay (correct)
  • Soil

What does hydraulic transmissivity measure?

<p>The rate at which water passes through an aquifer under a hydraulic gradient (A)</p> Signup and view all the answers

What is specific retention in aquifers?

<p>What is left behind after water has drained from the aquifer (D)</p> Signup and view all the answers

Which factor affects hydraulic conductivity related to the material itself?

<p>Specific gravity (A)</p> Signup and view all the answers

What are the two main natural sources of groundwater recharge mentioned in the text?

<p>Surface water and precipitation (D)</p> Signup and view all the answers

What is one consequence of taking out more water from an aquifer than what gets replenished?

<p>Salt water or contaminant intrusion (A)</p> Signup and view all the answers

What is the residence time of groundwater, as mentioned in the text?

<p>2 weeks to 10,000 years (D)</p> Signup and view all the answers

What can result from over-pumping or over-drafting an aquifer?

<p>Reduction of water in streams and lakes (B)</p> Signup and view all the answers

What are some causes of groundwater contamination according to the text?

<p>Drainage from abandoned mines (A)</p> Signup and view all the answers

What are some benefits of groundwater mentioned in the text?

<p>Lower temperature and constant water quality (B)</p> Signup and view all the answers

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