River Mole facts

Question 1

Avg rainfall in river mole catchment area

Answer 1

769mm a year

Question 2

How long is the river mole

Answer 2

80 km

Question 3

Relief of the Mole!!
exacerbates flood risk

Answer 3

95 m

Question 4

Mole has a flashy hydrograph due to

Answer 4

Lots of urban areas around it, reduced infiltration, increases surface run off so shorted lag time.

Question 5

Avg discharge of the river mole

Answer 5

1.5 cubic meters per second

Question 6

Seasonal variation

Answer 6

High discharge in winter (rains more and frozen ground less permeable), less discharge in summer.

Question 7

Flooding event

Answer 7

2014 in Leatherhead and Dorking.

Question 8

Upper mole

Answer 8

South, Gatwick, urbanisation, weald clay - impermeable so less infiltration and more surface run off

Question 9

Lower mole

Answer 9

North, Claygate, chalk, more infiltration so less surface run off.

Question 10

Links to carbon cycle

Answer 10

acts as a carbon sink when not flooded, when flooded carbon gets released into atmosphere.

Question 11

Catchment area of the river mole

Answer 11

512 km2

Question 11

Conclusion on interlinks between carbon and water

Answer 11

The carbon cycle cant exist without the water cycles flows - plants need water to grow.., oceans are the biggest store of carbon

Question 12

Human impacts

Answer 12

Pastoral farming - flashy, animals compact soil increasing run-off. (UM)
Arable farming - subdued, plants root systems increase infiltration decreasing run-off (LM)