Limitations 



Flood peaks reflect the complex interaction of many variables, and many formulas 

 have been devised to account for the effects of these variables. In most cases, how- 

 ever, the land manager has only limited information about the magnitude of the important 

 variables. For example, Rosa (1968) published water yield maps for Idaho, but maps of 

 this sort are not available for even such basic variables as rainfall intensity or 

 soils grouped according to their hydrologic properties. 



The user of these tables is cautioned that the tabulated values are far from being 

 definitive; they are only an approximation to give the land manager an idea of what may 

 be expected. Mr. C. A. Thomas has observed^ that the tabulated values may be too high 

 for streams with a high base flow and are probably too low for streams with flashy run- 

 off and low base flows. 



The user should bear in mind that the tables will probably be applied to areas 

 considerably smaller than those from which the tables were derived. Furthermore, flow 

 data for the very small drainages cover only a brief span of time. 



•^Personal communication, on file at Intermountain Forest and Range Experiment 

 Station, Forestry Sciences Laboratory, Moscow, Idaho. 



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