gaining vs. losing streams

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Gaining vs. losing streams Source: U.S.G.S.

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Gaining vs. losing streams. Source: U.S.G.S. Effects of pumping on GW - surface water interaction. Source: U.S.G.S. Schematic showing basic elements of an unconfined aquifer system. Source: U.S.G.S. - PowerPoint PPT Presentation

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Page 1: Gaining vs. losing streams

Gaining vs. losing streams

Source: U.S.G.S.

Page 2: Gaining vs. losing streams

Source: U.S.G.S.

Effects of pumping on GW - surface water interaction

Page 3: Gaining vs. losing streams

Schematic showing basic elements of an unconfined aquifer system

Source: U.S.G.S.

Page 4: Gaining vs. losing streams

Example of a perched water table and its relationship to the regional unconfined aquifer system

Page 5: Gaining vs. losing streams

Layered aquifer system(s), showing confined aquifer beneath an unconfined aquifer. Note the artesian conditions in the valley.

Page 6: Gaining vs. losing streams

Aquifer in fractured volcanic rocks (Kona, HI)

Source: U.S.G.S. National Groundwater Atlas

Page 7: Gaining vs. losing streams

Regional aquifers in the Mid-Atlantic U.S.

Source: U.S.G.S. National Groundwater Atlas

Fractured limestone and metamorphic rock

Unconsolidated sediments & sedimentary rock

Page 8: Gaining vs. losing streams

Locations of major sandstone aquifers in the U.S.

Source: U.S.G.S.

Page 9: Gaining vs. losing streams

Example showing porosity (note that for illustration purposes, the sand grains are shown to be unrealistically far apart)

Types of porosity

Page 10: Gaining vs. losing streams

Example showing porosity in a thin section of sandstone

Page 11: Gaining vs. losing streams

Hydrostatic Head: An Example...

Which way does the groundwater flow?

10 m

3 m

0 m

Page 12: Gaining vs. losing streams

What is the head at each point?

10 m

A

B

C

Pressure head = 7 mElevation Head = 3 mTotal Head = 10 m

3 m

0 m

Page 13: Gaining vs. losing streams

What is the head at each point?

10 m

A

B

C

Pressure head = ?? mElevation Head = ?? mTotal Head = ?? m 3 m

0 m

Page 14: Gaining vs. losing streams

What is the head at each point?

10 m

A

B

C

Pressure head = 0 mElevation Head = 10 mTotal Head = 10 m

3 m

0 m

Page 15: Gaining vs. losing streams