Numerical Solutions to CE problems: Water is flowing in a trapezoidal channel at a rate of $Q=(A+B),$ A$=2,$ B$=6.$ The critical depth $y$ for such a channel must satisfy the equation:

$0=1-\frac{Q^2}{g{A}_c^3}B$

where $\text{'}g\text{'}$ is the acceleration due to gravity, Ac is the cross$-$sectional area $(),$ and B is the width of the channel at the surface $(m).$ For this came the width and the cross$-$sectional area can be related to depth $y$ by:

$B=3+y,$ and $,A_c=3y+\frac{y^2}{2}$

Solve for $y$ using three open methods. In$$tial values and intervals should be in the right parameter.