Double mass curves are used

to check on the consistency of precipitation records

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as basis for storm rainfall analysis

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to determine average rainfall over an area

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to indicate rainfall distribution

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Solution

The correct option is A to check on the consistency of precipitation records
The double-mass curve can be used to adjust inconsistent precipitation data. The graph of the cumulative data of one variable versus the cumulative data of a related variable is a straight line so long as the relation between the variables is a fixed ratio.

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