Hydrographs

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What do hydrographs do?
They record how much water passes through a river at a particular point in its course (discharge).
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What do storm hydrographs do?
They show the change in discharge caused by a period of rainfall.
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How is rainfall shown on a hydrograph?
It is shown as a bar graph (in mm).
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How is discharge shown on a hydrograph?
It is shown as a line graph (in mm cubed per second).
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What is the rising limb?
The rising flood water in the river (on line graph).
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What is the peak flow?
The maximum discharge in the river (peak of the line graph).
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What is the recession limb?
The falling flood water in the river (on line graph).
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What is the basin lag time?
The time difference between the peak of the rain storm and the peak flow of the river (time between highest bar and peak flow).
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What is base flow?
The normal discharge of the river.
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What do you get if you combine the overland flow and through flow?
The storm flow.
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Other cards in this set

Card 2

Front

What do storm hydrographs do?

Back

They show the change in discharge caused by a period of rainfall.

Card 3

Front

How is rainfall shown on a hydrograph?

Back

Preview of the front of card 3

Card 4

Front

How is discharge shown on a hydrograph?

Back

Preview of the front of card 4

Card 5

Front

What is the rising limb?

Back

Preview of the front of card 5
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