A conventional flow duration curve is a plot between

Flow and percentage of time flow is exceeded

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Duration of flooding and ground level elevation

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Duration of water supply in a city and proportion of area receiving supply exceeding this duration.

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Flow rate and duration of time taken to empty a reservoir at that flow rate.

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Solution

The correct option is A Flow and percentage of time flow is exceeded
A flow-duration curve is a plot of discharge against the percentage of time the flow was equaled or exceeded. This curve is also known as discharge frequency curve.

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