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The discretized momentum equations are

$U_{i,P}^{n+1}=\frac{1}{a_{i,P}}(\sum _{k=1}{a}_{i,k}{U}_{i,k}^{n+1}+S_i)-\frac{h_P}{a_{i,P}}\sum _{k=1}{n}_{ik}\mathrm{\Delta }{s}_k{p}_k^{n+1}$

where the subscript $k$ indicates the cell face, $p=g\eta$ with $\eta$ being the water surface elevation, $n_{ik}$ is equal to the dot product of the velocity unit vector and the cell face unit vector.

The coefficient $a_{i,P}$ is equal to $a_{i,P}=\sum a_{i,k}+a_P^0$

The continuity equation is discretized as

The depth-averaged 2-D continuity and momentum equations are given by

$\frac{\partial h}{\partial t}+\frac{\partial (h{U}_j)}{\partial x_j}=S$

(1)

for $j=1,2$

$\frac{\partial (h{U}_i)}{\partial t}+\frac{\partial (h{U}_i{U}_j)}{\partial x_j}-{ϵ}_{ij3}{f}_c{U}_{j}h=-gh\frac{\partial \eta }{\partial x_i}-\frac{h}{{\rho }_0}\frac{\partial p_a}{\partial x_i}+\frac{\partial }{\partial x_j}\left({\nu }_{t}h\frac{\partial U_i}{\partial x_j}\right)+\frac{{\tau }_i}{\rho }$

(2)