EXAMPLES OF JOINT-CONTROLLED DRAINAGE 



N. 

 N. 

 N. 

 N. 



N. 



2°W. 



4°W. 

 5°W. 

 6°W. 



8° W. 

 N. 10° W. 



N. 12° W. 

 N. 15° W. 

 N. 16° W. 

 N. i8°W. 

 N. 20° W. 

 N. 2 4 ° W. 

 N. 26 W. 

 N. 30° W. 

 N- 34° W. 

 N. 40° W. 

 N. 44 W. 

 N. 60° W. 

 N. 74 W. 

 N. 76 W. 

 N. 8o° W. 

 N. 8 4 ° W. 



i 



30 



6 



7 



14 

 54 

 34 



4 



5 

 i 



20 1 

 15 j 



N.-S. 15 



N. 4°E. i 



) 43 



I 



139 

 88 

 288 



35 

 51 



86 



E.-W. i 



Making use of five-degree intervals the above results are graphically 

 summarized in Fig. 6. 



In order of relative numerical importance the joint directions of 

 the district are thus found to be: N. 20 W. (288), N. io° W. (139), 

 N. 7o°-75° E. (131), N. i5°-i6° W. (88), N. 6o° W. (86), N. 30 

 E. (68), N. 8o° E. (62), N. 40 W. (51), N. 4 °-6° W. (43), N. 3o - 3 4° 

 W. (35), N. 85 E. (35), and N.-S. (15). These twelve directions 

 include 941 of the 1,004 measurements, and, with the exception of the 

 directions N. 12 W., whose fourteen observations should perhaps be 

 added to the 139 directed N. io° W., no other direction is repre- 

 sented by more than six measurements. 



From the above figure it will also appear that there is an 

 orthogonal joint set having directions N. 30 E., and N. 6o° W. 

 There are also two other near-lying orthogonal sets, the one having 

 direction N. 74°-75° E. and N. io°-i6° W., and the other N. 8o°-85° 

 E. and N. 4°-6° W. In the vicinity of Watkins Glen, the first- 

 mentioned set is the dominant one, while at the other localities this 

 set is rarely observed, the other sets taking its place. 



