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  Fig. 
  9 
  Diagram 
  showing 
  the 
  relation 
  between 
  the 
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  runoff, 
  

   in 
  inches, 
  on 
  the 
  Upper 
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  Precipitation 
  in 
  inches 
  

   10 
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  40 
  

  

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  Fig. 
  10 
  Diagram 
  showing 
  the 
  relation 
  between 
  the 
  precipitation 
  and 
  runoff 
  , 
  

   in 
  inches, 
  on 
  the 
  Upper 
  Hudson 
  river, 
  expressed 
  by 
  exponential 
  formula. 
  

  

  