In the accompanying hydrograph for major river,a flood was caused by a single episode of heavy rainfall 50 kilometers upstream.When did the rain most likely occur? 
Definitions:
Appreciated
Increased in value or price over time.
US Dollars
The official currency of the United States, widely used as a standard of exchange internationally.
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The total quantity of goods and services that consumers in the United States are willing and able to purchase at a given price level and time.
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The official currency of the United Kingdom, symbolized as £.
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