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through October. During each of these four months, from 1.9 

 to 3.4 percent of the annual water yield is passed. 



Three basic differences are evident; 



i. Monthly water availability in Montana's streams is less 

 evenly distributed than occurs in the East, a region 

 where annual precipitation is greater and where 

 rainfall contributes significantly to year-round flows. 



2. The availability of water is greatest in Montana in 

 May, June and July. In contrast, the high flow period 

 in the East begins in late winter. 



3. The period of lowest flows in Montana occurs in winter, 

 while Eastern streams have their lowest flows in 

 summer. 



