water extraction

Question 1

why is ground water extracted

Answer 1

for public supply
11% domestic
19% manufacturig
70% for agricultural

Question 2

how many people does the Kennet river supply

Answer 2

200,000 supplies the town of swindon

Question 2

why is there lots of ground water river Kennet

Answer 2

because upper layer is chalk and highly permeable

Question 3

how big is the area river Kennet drains

Answer 3

1200 kmsquared

Question 4

impacts of water extraction of river Kennet

Answer 4

rates of ground water extraction have exceeded recharge rates resulting in the water table falling by 10-14 percent. this was excerterbated to 20% in 2003 because of a dry period. reduce water table has secondary impacts of water quality and vegetation

Question 5

water extraction impact on surface stores

Answer 5

its has significantly reduced surface stores such as wetlands and standing water

Question 6

in terms of flows what has it led to

Answer 6

reduced saturated overland flow

Question 7

what has dried up

Answer 7

springs and seepages

Question 8

geology of London artesian basin

Answer 8

permeable chalk trapped between London clay and Gault clay

Question 9

what did over exploitation of the London artesian basin mean

Answer 9

it meant that there was a 90m fall in water table in the 1900-1950

Question 10

how much water is used for agriculture in the uk

Answer 10

around 300 million m3 per year this is 1.5% of fresh water in the UK