AIM: How do people use water in the ground?

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Presentation transcript:

AIM: How do people use water in the ground? Do Now: Looking at the 3 jars below (filled with the same amount of sorted beads), describe the Permeability, Porosity and Capillarity of each.

I. Water Table - Marks the location of water underground (boundary). - rises with precipitation and lowers with evaporation and usage. Zone of Aeration Pore space contains mostly air. Zone of Saturation Pore space contains mostly water. What must exist below the zone of saturation for water to fill in the spaces? Impermeable Rock

A. Groundwater is the zone of saturation. - water sheds (drainage basin) are the areas of land where water infiltrates to create the groundwater supply. - ground water can fill lakes, swamps and rivers when there is little precipitation. Is the amount of ground water constant? Give an example of something that might change the amount of ground water?

**This is filled by the water shed area. B. Aquifer – permeable soil/rock that allows groundwater to move freely. **This is filled by the water shed area. Impermeable rock

II. Groundwater Features A. Springs – areas where the water table rises and meets the surface naturally. - Hot Springs Water is heated by magma underground. Yellowstone National Park, Wyoming

What do you think supplies the heat? B. Geysers – pressurized heated water that is forced out of the ground. What do you think supplies the heat? - Heat comes from magma Old Faithful, Yellowstone National Park, Wyoming

C. Wells - holes dug below the water table so people can access water. Pumping causes a drawdown (lowering) of the water table. - this forms a cone of depression in the water table.

III. Groundwater Problems 1) Overuse and contamination threatens groundwater supplies.

2) Sinkholes - surface depressions. - over use of the ground water causes subsidence (sinking) - bedrock dissolves (limestone) and the ground collapses.

Closure: Review Book p.128-130 # 1-10 With the person sitting next you, explain what would happen to the water table and ground water supply if there were many wells dug into the ground in one area? Describe what might make the water table move up or down within the ground? Review Book p.128-130 # 1-10