DRAINAGE BASINS. 



51 



The more rapid height growth of the chestnut in large measure accounts for 

 the scant reproduction of the 3^ellow poplar in culled woods, for poplar and 

 chestnut both freely seed such openings, the young poplars often outnumbering 



feet 



120 



80 



40 



20 



20 40 60 60 100 120 I40 years 



Fig. 2. Curves showing the rates of height growth of yellow poplar and chestnut on good soil. 



the chestnuts, but the chestnut grows far more rapidly, overtops the poplar, and 

 suppresses it. 



DESCRIPTION OF DRAINAGE BASINS. 



In order to present in more convenient form detailed information concerning 

 forest conditions in the Southern Appalachians the following descriptions have 

 been arranged by drainage basins, beginning at the northeast and moving around 

 the mountains to the place of beginning. This arrangement will serve an important 

 purpose in the consideration of water flow and also in that of transportation. 

 The region has, for this purpose, been divided into the following fourteen drainage 

 aieas: 



New River basin. 



South Fork of Holston River basin (southern tributaries only). 



Watauga River basin. 



Nolichucky River basin. 



French Broad River basin. 



Big Pigeon River basin. 



Northwestern slope of Smoky Mountains. 



Little Tennessee River basin. 



Hiwassee River basin. 



Tallulah and Chattooga River basins. 



Toxaway River basin. 



Saluda River and First and Second Broad River basins. 



Catawba River basin. 



Yadkin River basin. 



