Stability class

σ y ( x ) , meters

σ z ( x ) , meters

A

0.22 x ( 1 + 0.0001 x ) 1 / 2

0.2 x

B

0.16 x ( 1 + 0.0001 x ) 1 / 2

0.12 x

C

0.11 x ( 1 + 0.0001 x ) 1 / 2

0.08 x ( 1 + 0.0002 x ) 1 / 2

D

0.08 x ( 1 + 0.0001 x ) 1 / 2

0.06 x ( 1 + 0.0015 x ) 1 / 2

E

0.06 x ( 1 + 0.0001 x ) 1 / 2

0.03 x ( 1 + 0.0003 x ) 1

F

0.04 x ( 1 + 0.0001 x ) 1 / 2

0.016 x ( 1 + 0.0003 x ) 1