16 
BULLETIN 181^ U. S. DEPARTMENT OF AGEICULTUEE. 
hydrograph, was 53,353,000,000 cubic feet, which is equivalent to 7.35 
inches in depth over the entire watershed. These figures indicate 
that the run-off during the spring flood of 1902 amounted to 56.1 
per cent of the rainfall. 
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a f^ 
The method employed for obtaining the probable maximum rate of 
run-off involves the determination of the following: 
(1) The approximate time required for the maximum flood-pro- 
ducing storm to raise the river from a low stage to a maximum 
stage at the gauging station, when no storage exists. 
