AS Geography Hydrographs

What is the area of land surrounding a river called, from where it collects rain?

• drainage basin

• stream

• hills

• fields

Why does urbanisation cause increased flooding?

• building roads and houses means the ground becomes impermeable.

• building roads and houses means the ground becomes permeable.

On a hydrograph what is shown by the blue line labelled at 1?

• river discharge (flow)

• rainfall

• amount of sunshine

Discharge is the volume of water flowing down a river in cumecs which means...

• cubic metres per second

• column of water passing a point

• stream depth in centimetres

• force of the flow

Line 1 on a hydrograph shows a...

• rising river discharge

• falling river discharge

• peak discharge

• steady discharge

Line 2 on a hydrograph shows a...

• rising river discharge

• falling river discharge

• peak discharge

• steady discharge

Line 3 on a hydrograph shows a...

• rising river discharge

• falling river discharge

• peak discharge

• steady discharge

Label 1 shows the time between peak rainfall and peak discharge. This is called...

• lag time

• delay time

• past time

• lazy time

The highest river level reached after heavy rain is called...

• peak discharge

• normal flow

• drought

• peak rainfall

If the land is covered in trees, rainwater will reach the river .................... .

• more quickly

• more slowly