Hydrographs And Human Impacts On Water Cycle

Question 1

What are storm hydrography

Answer 1

Illustrate how a river in a specific location responds to a rainfall event

Question 2

Gauging stations

Answer 2

Measure discharge flow rate cumecs m3/sec

Question 3

Flashy hydrograph vs subdued

Answer 3

Short lag time, steep rising and falling limb
Small rising and falling limb

Question 4

Deforestation

Answer 4

Reduces interception rates allowing rainwater to hit surfaces directly
Lack of vegetation roots reduces infiltration rates into soil- overland flow will be
Soil exposed to erosion

Question 5

Afforestation

Answer 5

Opposite effect of deforestation
Useful flood prevention measure

Question 6

Agriculture

Answer 6

-ploughing breaks up top soil-greater infiltration
-terracing on hillsides-stops water going downhill
-grass crops- increase infiltration rates into

Question 7

Growth of urban areas

Answer 7

Urban growth leads to expansion of impermeable surfaces, surface runoff

Question 8

Peak precipitation

Answer 8

Highest level of precipitation in antecedent rainfall then event

Question 9

Rising limb

Answer 9

How long it takes for discharge to peak after an amount of precipitation

Question 10

Lag time

Answer 10

Time between peak rainfall and discharge

Question 11

Base flow

Answer 11

Portion of water that is from the ground

Question 12

Falling limb

Answer 12

Level of discharge decreases and river level falls