General Terms:  
1. Discharge
2.  Load
3. Stream
4.  Channel
5. Floods
  
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Floods: Usually are produced by heavy rains. 

Floods: occur when stream's discharge become so great that it exceed the capacity of the channel; therefore causing the stream to overflow its bank. 

Widespread rainfall over weeks may produce inundation floods on many stream that last for weeks. 
 

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Streams are equilibrium systems 

Stream: body of water that flows down slope along a clearly defined natural passage-way. 

Streams convey a volume of water (discharge) and carry sediments (load) toward the ocean.

River versus Stream:
a river is simply a large stream

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Channel: Natural passage way of a stream.

Channelization: modifications of the stream channel itself that are usually intended to increase the velocity of water flow, the volume of channel, or both.

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Load: Detritus (sediments) transported by the stream
 

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Discharge: Quantity of water passing by a point on the stream in a given interval of time.