Natural Systems A Level Geography AQA CGP p8 Variation in Runoff

................. occurs when there is more water than land can absorb. The excess liquid flows across the surface of the land and into nearby creeks, streams, or ponds

• Flow

• Output

• Runoff

....................... is the volume of water that flows in a river per second

• River discharge

• River flood water

• Runoff

River discharge is measured in cubic metres per seconds. What is the term used for this measurement?

• cumecs

• cumesecs

• cumsecs

High levels of runoff (a) ............... discharge because more water makes into the river, increasing its (b)..............

• (a) increases

  (b) area

• (a) increases

  (b) volume

• (a) decreases

  (b) mass

Hydrographs are graphs that show how the volume of water flowing at a certain point in a river changes over a period of time. .............. hydrographs show river discharge around the time of a storm event. ( Two correct answers)

• Flood Hydrograph

• Peak Time Hydrograph

• Storm Hydrograph

• Torrent Hydrograph

This is the highest point on the graph when the river discharge is at its greatest.

• Highest discharge

• Peak discharge

• Rising Limb

Lag time is the delay between peak rainfall and peak discharge and happens because .............................

• it takes time for the precipitation to reach its maximum

• it takes time for the rainwater to flow into the river

• it takes time for the river channel to fill up to its bank

The (a) ............... limb is the part of the graph up to peak discharge and the (b) ............... limb is the part of the graph after peak discharge

• (a) rising

  (b) falling

• (a) falling

  (b) rising

.................. discharge (A) is the point when the water level reaches the top of the river channel.

• Bankfull

• Channelfull

• Plainfull

Which of the following falling limbs shows that water is flowing in from stores long after it has stopped raining.

• sharp falling limb

• shallow falling limb