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Geography - water and carbon > Runoff > Flashcards

Flashcards in Runoff Deck (12):
1

what is meant by field capacity?

how much water a field can hold - it remains the same throughout the year as the capacity it holds never changes

2

what is runoff?

water in the river and water flowing into the river

3

how does volume affect river discharge?

low volume = low amount of discharge
high volume = high amount of discharge

4

how does speed or velocity of the river affect discharge?

low velocity = less discharge
high velocity = high discharge

5

what are the factors that affect flow patterns throughout the year in uk rivers?

precipitation
evapotranspiration
relief
rock type
temperature

6

what is the lag time?

the time taken from the peak rainfall to the peak discharge

7

what is the base flow?

the amount of water that would be in the river without the addition of storm water

8

what is the rising limb?

indicates how quickly a river responds to a storm

9

what is a flood hydrograph

graph of discharge of a river over a period of time

10

what are the factors that affect discharge?

type of rock
amount of vegetation
height of land
relief
urbanisation

11

what are the human factors that affect the shape of the flood hydrograph?

land use - urbanisation
afforestation
deforestation

12

what are the physical factors that affect the shape of a flood hydrograph?

rock type
time of year
amount and intensity of rainfall
relief of the land
length of precipitation event