A stable canal is to be designed for a discharge of $30\frac{m^3}{sec}$ with average size of the bed material is $0\mathrm{.}3$ mm $.$ Calculate the canal dimensions. What would be the dimensions of this canal if it were to be designed on the basis of Kennedy's method with critical velocity ratio equal to $1,$ Bazin's coefficient $1\mathrm{.}3$ and the B$/$D ratio the same as obtained above.