GROUNDWATER WHAT IS THE CHART SHOWING Water table
GROUNDWATER
WHAT IS THE CHART SHOWING?
Water table Zone of aeration Zone of saturation Water table
Water table • What will make the water table rise? • http: //techalive. mtu. ed u/meec/module 06/Th e. Water. Table. htm • What will make the water table lower?
Groundwater affects surface water
Permeability
permeability • http: //techalive. mtu. edu/meec/module 06/P ermeability. htm
AQUIFERS • Ogallala Aquifer! • Needs to be below water table in a permeable layer • Ogallala aquifer”fastest disappearing aquifer in the world”
WELLS • Needs to be in an aquifer http: //techalive. mtu. edu/meec/module 06/Well. Drilling. htm
PUMPING WELLS • Creates cone of depression • Lowers water table • Creates a “drawdown”
Formation of a cone of depression in the water table
Cone of depression
subsidence • Pumping out gw lowers the surface • Surface Slowly sinks
Artesian wells • Flows to the surface naturally • Under pressure • “sandwiched” between two impermeable layers
Flowing vs. non flowing
GROUNDWATER POLLUTION • SOURCES – – Septic tanks Landfills Fertilizers/pesticides Underground storage tanks (gas stations)
Septic tanks
landfills
Hot springs and geysers • Groundwater heated by magma reaches the surface
Steamboat, CO
OLD FAITHFUL • Webcam: http: //www. nps. gov/fe atures/yell/webcam/ol d. Faithful. Streaming. ht ml • Eruptions every 45 -90 minutes apart • Time is increasingwhy? • http: //upload. wikimedi a. org/wikipedia/comm ons/transcoded/4/46/ Old. Faithful. ogg/Old. Fa ithful. ogg. 360 p. webm
• http: //highered. mcgrawhill. com/sites/0072402466/student_view 0/ chapter 11/animations_and_movies. html#
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