These 2 equations are the sum of one of "Cem88(V)" and "CEM88(D)" equations with a triangular sill.

Kindsvater-Shen formula [1] is used for the triangular part :

$Q=C_e\frac{8}{15}\mathrm{tan}\frac{\alpha}{2}\sqrt{2g} h^{5/2}$

The discharge coefficient $C$ used in SIC is $C=C_e\frac{8}{15}\sqrt{2g}$. $C=\approx1,37$ for $C_e=0,58$ as suggested by the norm [1].