Problem $2.(4$ pts$.)$ Water flows through a vertical contraction $($venturi$)$ section. Piezometers $($open to local atmosphere$)$ are attached to the upstream pipe section $($cross section $1)$ and the minimum area section $($cross section $2)$ as shown. The distance between sections $1$ and $2$ is L inches. The velocity in the pipe is $10f\frac{t}{s}.$ The difference in elevation between the two water levels in the Piezometers is $16$ inches. The water temperature is $68F.$ Find $(2\mathrm{.}1)$ the velocity V$2,$ and $(2\mathrm{.}2)$ the ratio of two diameters: $\frac{D_1}{D_{?}}.$