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Groundwater Notes

Groundwater Notes. Water Cycle vocab. Evaporation: liquid to gas from bodies of water Transpiration: liquid to gas from plants Condensation: gas to liquid. 98% of available freshwater is groundwater. Porosity vs. Permeability. Porosity vs. Permeability. .

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Groundwater Notes

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  1. Groundwater Notes

  2. Water Cycle vocab • Evaporation: liquid to gas from bodies of water • Transpiration: liquid to gas from plants • Condensation: gas to liquid

  3. 98% of available freshwater is groundwater

  4. Porosity vs. Permeability

  5. Porosity vs. Permeability. • Porosity is the volume of open spaces (pores) in rock or soil. • Permeability is the measure of a material’s ability to transmit water. The larger the grain, the more permeable it is.

  6. High vs. Low Porosity

  7. Permeability • Smaller grains = Low permeability ex: Clay, Silt • Larger grains = High permeability ex: Sand, Gravel

  8. Which column has the highest permeability?

  9. Ground water • Water that is found in the zone of saturation is called ground water.

  10. Water • Water seeps into the pores in rock or sediment (percolation) and collects as ground water in aquifers. • Drinkable water is called potable water. • When an aquifer is depleted, it can be replenished. This process is called recharge.

  11. Zones of Aeration and Saturation

  12. Cone of Depression

  13. Drawdown

  14. Pump Driven Wells

  15. Subsidence • When the Earth’s surface sinks due to the removal of ground water.

  16. Salt Water Intrusion

  17. Artesian Wells • A pump-less well in which the water rises to the surface because of hydrostatic pressure.

  18. Springs and Perched Water Tables

  19. Springs • A flow of groundwater that emerges naturally at the ground surface • Springs that are warmer than the average air temperature are called hot springs.

  20. Hot Springs & Geysers

  21. Geysers

  22. How Geysers Work • For geyser to occur there must be heat, water and a plumbing system. • A magma chamber provides the heat, which radiates into surrounding rock. Water from rain and snow works its way underground through gractures in the rock. • As the water reaches hot rock it begins to rise back to the surface, passing through rhyolite, which is former colcanic ash or lava rich in silica. • The hot water dissolves the silica and carries it upward to line rock crevices. This forms a constriction that holds in the mounting pressure, creating a geyser’s plumbing system. • As superheated water nears the surface, it’s pressure drops and the water flashes into steam as a geyser.

  23. Karst Topography • A topography consisting of numerous sink holes.

  24. Sinkholes / Cenotes / Swallet holes

  25. Sinkholes • Water dissolves limestone (sediment made from skeletons of marine organisms) and the chemical reaction produces carbonic acid which is highly corrosive.

  26. Stalactites vs. Stalagmites

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