GPN 59 Hydrographs

In a hydrograph, what does the line represent?

• Temperature

• Rainfall

• Discharge

• Population

What is measured in cumecs?

• Temperature

• Volume of water flowing past a point

• Population density

• Economic growth

The time between peak rainfall and peak discharge is known as ______.

• A) Base flow

• B) Lag time

• C) Rising limb

• D) Recessional limb

What is the base flow of a river?

• The maximum capacity of the river

• The normal flow of the river below bank full capacity

• The flow during a flood

• The flow during a drought.

Which of the following is true about flashy rivers?

• They have a flat discharge line

• They flood easily and quickly

• They flood in summer

• They are unlikely to flood

Fill in the blank: The ______ limb is when the flood waters are still rising.

• A) Recessional

• B) Rising

• C) Base

• D) Peak

What does the term 'in spate' refer to?

• A drought condition

• A river flooding

• A river drying up

• A river freezing

Fill in the blank: Urbanized areas with little infiltration tend to flood ______.

• A) Slowly

• B) Quickly

What is the name for rainfall which has previously occured (which raises the water table)?

• Anticedent

• Antecedent

• Antisedent

• Antesedent

What is the role of permeable rocks in flood management?

• They increase the speed of water flow

• They slow the rate at which water reaches the river

• They have no effect on water flow

• They cause more flooding.