Hydrograph

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River Velocity
The speed the river water flows through the river channel. It is measured in m/s. The equation...
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River discharge
Volume of water passing a given point in a river at a given time. It is measured in m3/s. The equation is...
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Runoff/ Storm flow
The water that arrives in the river by surface run off or through-flow of the rock (rapid).
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Rising limb
It indicates how quickly a river responds to the 'storm' and represents the rising discharge of the river. The steeper the rising limb the more likely the river is to flood.
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Falling/ Receding limb
It indicates the rate the river discharge falls, it shows when the river returns to base flow.
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Peak Discharge
The maximum amount of water in the river after the rainfall event.
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Bankfull discharge
The maximum amount of discharge that a river can hold before it burst its banks and floods. If the bank-full discharge is exceeded the river will flood and over top/ burst the banks
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Lag time
The amount of time between peak discharge and peak rainfall. Typically, the shorter the lag time, the faster the discharge of the river will increase- more likely to flood and will create a 'flashy' hydrograph.
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Peak Rainfall
The highest amount of rainfall that occurred in one rainfall event
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Discharge line
This follows and shows how much water is in the river.
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Labels
Hours after rainfall event, Rainfall (mm), River channel runoff/ discharge (cumecs) - cubic meter per second
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Other cards in this set

Card 2

Front

Volume of water passing a given point in a river at a given time. It is measured in m3/s. The equation is...

Back

River discharge

Card 3

Front

The water that arrives in the river by surface run off or through-flow of the rock (rapid).

Back

Preview of the back of card 3

Card 4

Front

It indicates how quickly a river responds to the 'storm' and represents the rising discharge of the river. The steeper the rising limb the more likely the river is to flood.

Back

Preview of the back of card 4

Card 5

Front

It indicates the rate the river discharge falls, it shows when the river returns to base flow.

Back

Preview of the back of card 5
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