Name

Equation

Variables

Smetana

$L=6\left(y_2-y_1\right)$

y₂, y₁, conjugates depth

Safranez

$L=5.9y_1{F}_{r_1}$

y₁, minor conjugate, Froude number

Einwatcher

$L=8.3y_1\left(F_{r_1}-1\right)$

y₁, minor conjugate, Froude number

Woycicki

$L=\left(y_2-y_1\right)\left(8-0.5\frac{y_2}{y_1}\right)$

y₂, y₁, conjugates depth

Chertusov

$L=10.3y_1{\left(F_{r_1}-1\right)}^{0.81}$

y₁, minor conjugate, Froude number

Pavlovsky

$L=\left\{2.5\left[1.9\left(\frac{y_2}{y_1}-1\right)\right]\right\}{y}_1$

y₂, y₁, conjugates depth

Sieñchi

$L=5\left(y_2-y_1\right)$

y₂, y₁, conjugates depth