The construction of impounding r eservoir is required when

- 1
  
  average annual flow in the stream is lower than average demand
- 2
  
  the rate of flow in the stream, in dry season is more than the demand
- 3
  
  the rate of flow in the stream, in dry season is less than the demand
- 4
  
  the rate of flow in the stream is equal to the demand

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