[Property/behavior] Aeration [Sand] Good [Silt] Medium [Clay] 
Poor
H i g h
P o o r
V e r y s l o w
H i g h t o m e d i u m
S l o w
L o w
L o w i f a g g r e g a t e d , o t h e r w i s e h i g h
M o d e r a t e t o v e r y h i g h
G o o d
L o w ( u n l e s s c r a c k e d )