SOI KCK OF RIYKR WATI.K 



57 



That the source of river water is the rain and snow which fall 

 from the atmosphere may be inferred from various familiar phe- 

 nomena. Thus (i) streams are more numerous in regions where 



Fig. 37. Scene in the freight-yards of Kansas City after the flood of 1903. 



(U. S. Weather Hureau.) 



the rainfall is abundant than in those where it is scarce (Figs. 

 38-39); (2) multitudes of small streams spring into being with 

 e;u-h heavy fall of rain and with each period of rapidly melting 



Fig. 38 Fig. 39 



Fig. 38. Map showing the many streams of ;i humid region. Central Ken- 

 tucky. The an-a is about 225 square miles. 



Fig. 30. Map showing the few streams of an arid region. Northern Arizona. 

 The area is as great as that shown in Fig. 38. 



