A round-bottom triangular lined canal is to be laid at a slope of $1$ in $1500$, to carry a discharge of $25 \mathrm{~m}^{3} / \mathrm{s}$. The side slopes of the canal cross-section are to be kept at $1.25 \mathrm{H}: 1 \mathrm{~V}$. If Manning's roughness coefficient is $0.013$, the flow depth (in meters) will be in the range of
- $2.39$ to $2.42$
- $1.94$ to $1.97$
- $2.24$ to $2.27$
- $2.61$ to $2.64$