Water Extraction Flashcards

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1
Q

Size of River Kennet Catchment area

A

12,000km2

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2
Q

What happened to the flows after extraction exceeded recharge

A

10% reduction in flows of river. springs and seepages dried up, as water table lowered

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3
Q

Aquifer definition

A

A permeable/porous rock containing groundwater that can be extracted for public use by a well or borehole

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4
Q

Artesian Basin definition

A

An aquifer trapped between 2 layers of impermeable rock and as the upper sedimentary rocks create Artesian pressure the water can flow up by its own pressure when tapped

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5
Q

Example of Artesian Basin

A

London

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6
Q

Rocks in London Artesian Basin

A

Chalk aquifer between clay

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7
Q

What happened in 19th century to the London Basin

A

Over extraction led to a significant 90m fall in the water table

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8
Q

What happened in the 20th century to the London Basin

A

Allowed to recover and water table rose. Started to threaten houses in 1990s so was tapped

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