The Storm Hydrograph

What is a Storm Hydrograph and what does it do? 

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THE Storm Hydrograph

The Storm Hydrograph

A storm hydrograph shows how a particular river responds to a storm.

  • When a storm begins, discharge (amount of river water) does not increase immediately as only a little of the rain will fall directly into the channel.
  • The first water to reach the channel after reaching the ground will be surface-runoff.
  • The gap between the time of peak rainfall and peak discharge is called Lag Time. 
  • A river with a short lag time and a high discharge is more likely to flood.  
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