Power Function:

 

a *

[ x

to the power of

c ]

- f

=

[to the power of ] - =

  1. To use only the power function, a=1 and f=0 (i.e., the default values).
  2. To find a square root of x, c = 0.5
  3. To find sigma values, use the tables below.

    sigma-y

    if stability is:

    then "a" is:

    and the other variables are:

    A

    213

    "x" = the distance downwind

    B

    156

    "f" = 0

    C

    104

    "c" = .894

    D

    68

    E

    50.5

    F

    34

    sigma z (x = distance downwind)

    If stability is:

    and if x<1 km, then:

    but if x>1 km, then:

    "a" is:

    "c" is:

    "f" is:

    "a" is:

    "c" is:

    "f" is:

    A

    440.8

    1.941

    -9.27

    459.7

    2.094

    9.6

    B

    106.6

    1.149

    -3.3

    108.2

    1.098

    -2

    C

    61

    0.911

    0

    61

    0.911

    0

    D

    33.2

    0.725

    1.7

    44.5

    0.516

    13

    E

    22.8

    0.678

    1.3

    55.4

    0.305

    34

    F

    14.35

    0.74

    0.35

    62.6

    0.18

    48.6