ABSTRACT 



The long-term average water yield of a watershed appears 

 to be a good index to the magnitude of its expected peak flow. On 

 the basis of this relation, tables are presented showing expected 

 peak flows that are applicable to watersheds in Idaho and Mon- 

 tana west of the Continental Divide. Tabulated peak flows are 

 for four different return periods: mean annual; 5; 10; and 20 

 years. Three examples are given to illustrate the tables' field 

 application. 



