















At = 13° 



F 















































































































































































































































h 

 (FEET) 

































170 







s* ' 



^*~ 



- — ' 



h (conve 



rgence)- 



















160 









140 



130 





/ 











^ 



pP- 

















120 

 110 





/ 



/ 



/ 





V\ — 



- —zs^ 























90 

 80 





/ 



/ 



1 / 



/ 









-n^- 



















70 

 60 





/ 



/ , 

 I / 



s 



V®£- 



jence) 





T^dW^ 



jence}^. 

















40 

 30 





1/ 

 / / 



/ yS 



























20 



10 

 





'A 



17 





























02 0.4 0.6 0.8 1.0 12 1.4 1.6 1.8 2.0 2 2 2 4 2 6 



k 

 FIGURE 20 PARAMETERS v AND h VERSUS k FOR STABILITY INDEX At = 12° TO 14° F 



2.8 3.0 



la 



