Water Extraction

Question 1

Size of River Kennet Catchment area

Answer 1

12,000km2

Question 2

What happened to the flows after extraction exceeded recharge

Answer 2

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

Question 3

Aquifer definition

Answer 3

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

Question 4

Artesian Basin definition

Answer 4

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

Question 5

Example of Artesian Basin

Answer 5

London

Question 6

Rocks in London Artesian Basin

Answer 6

Chalk aquifer between clay

Question 7

What happened in 19th century to the London Basin

Answer 7

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

Question 8

What happened in the 20th century to the London Basin

Answer 8

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