1. Groundwater Systems SWBAT relate the different types of springs to common systems of aquifers; explain how groundwater is withdrawn from aquifer systems by wells; describe the major problems that threaten groundwater supplies

2. Springs Spring Spring A natural discharge of groundwater, usually found where an aquifer meets and aquiclude A natural discharge of groundwater, usually found where an aquifer meets and aquiclude Hot springs Hot springs A type of spring with temperatures hotter than a human body. The temperature does not change with the season, or air temperature A type of spring with temperatures hotter than a human body. The temperature does not change with the season, or air temperature Geysers Geysers Explosive hot springs that erupt at regular intervals Explosive hot springs that erupt at regular intervals

3. Wells Wells Wells Holes dug or drilled deep into the ground to reach a reservoir Holes dug or drilled deep into the ground to reach a reservoir Drawdown Drawdown The difference between the original water table level and the level in a pumped well The difference between the original water table level and the level in a pumped well Recharge Recharge Runoff and precipitation is added back to the zone of saturation Runoff and precipitation is added back to the zone of saturation

4. Confined Aquifers Artesian well Artesian well When the rate of recharge is high enough, pressurized water in a well drilled into a confined aquifer may spurt above the land surface in the form of a fountain When the rate of recharge is high enough, pressurized water in a well drilled into a confined aquifer may spurt above the land surface in the form of a fountain

5. Get your lab notebooks With a partner complete the problem solving lab on page 253 With a partner complete the problem solving lab on page 253 Draw the graph and answer the questions based on your graph. Draw the graph and answer the questions based on your graph. You may check your graph before your start your questions You may check your graph before your start your questions

6. Check your Graph

7. Confined Aquifers How is groundwater withdrawn from aquifer systems using wells? How is groundwater withdrawn from aquifer systems using wells? A hole is dug down into an aquifer and water is pumped up through the hole for use. Precipitation and runoff help recharge the aquifer, but if more is used than is replaced it can dry up. A hole is dug down into an aquifer and water is pumped up through the hole for use. Precipitation and runoff help recharge the aquifer, but if more is used than is replaced it can dry up.

8. Threats to our Water Supply Overuse Overuse Water is used at a greater rate than it can be replenished Water is used at a greater rate than it can be replenished Subsidence Subsidence The land sinks due to the overuse of water The land sinks due to the overuse of water Pollution Pollution Sewage, industrial waste, landfills, and agricultural chemicals can make freshwater unusable Sewage, industrial waste, landfills, and agricultural chemicals can make freshwater unusable

9. Threats to our Water Supply Chemicals Chemicals Certain chemicals cannot be filtered out in fine grained sediments Certain chemicals cannot be filtered out in fine grained sediments Salt Salt Makes water undrinkable, although it is not toxic Makes water undrinkable, although it is not toxic Radon Radon A radioactive gas that decays in rocks and dissolves into water A radioactive gas that decays in rocks and dissolves into water

10. With a partner Answer questions 1-6 on page 257 Answer questions 1-6 on page 257 Be sure to use complete sentences, restating the question in the answer Be sure to use complete sentences, restating the question in the answer Finish for homework Finish for homework