\[
L’ = L \times C_f
\]
\[
C_f = 1 – \frac{h}{R}
\]
Where:
$L’$ = equivalent mean sea level length
$L$ = measured line
$C_f$ = reduction factor
$h$ = average elevation
$R$ = average radius of curvature
$L’$ = equivalent mean sea level length
$L$ = measured line
$C_f$ = reduction factor
$h$ = average elevation
$R$ = average radius of curvature
