16 



BULLETIN 181_, U. S. DEPARTMENT OF AGEICULTTJKE. 



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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 0)>12ni090}{ 70000HS h09>IOVr l'^IH>^^nO AIIQOOIV/^ 



. PQ 



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The rnethod 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, 



