85 



80 



75 



70 



CO 



O 



o:65 

 o 



Q. 



60 



55 



!0 



1 JT 



I 



/ 



/ 



H / 

 / ^ 



//I P/ // 



I hi i /. /' 



/ 



B = - 



D = i±^~ 

 E = 



F6= > 



H = /////// 



80 



-3 



30 40 50 60 70 



CLAY- SIZE FRACTION «2/i),% 



FIGURE 10. RELATION OF POROSITY TO CLAY-SIZE FRACTION. (SAMPLE VALUES 

 FALL WITHIN THE LIMIT LINES FOR EACH AREA SHOWN) 



29 



