BOTTOM RISE EXPERIMENT

Abrupt change in bottom elevation for a relatively short distance in the form of a rise in a channel bottom is also a RVF$.$ Depending upon the upstream regime of flow the following water profiles are observed as depicted in the sketches below. It must be observed that Energy is conserved. width b$=7\mathrm{.}7$cm

For Subcritical upstrem flow

And for supercritical upstream flow

Report should include the following using $q$ and the measured values of depths $y_1=40\mathrm{.}4$mm and $y_2=32$mm$.$

The plots of Specific Energy $(y-E)$ for the valid q$.$ Start with $y=0\mathrm{.}005m$ to determine respective values of $E$ and $\frac{F}{b}$ and carry on with increments of $0\mathrm{.}005$ until $y=12cm.$

Measure $y_1=40\mathrm{.}4$mm and $y_2=32$mm

Determine $E_1$ and $E_2$

Mark $(y_1,E_1)$ and $(y_2,E_2)$ on the plot of the Specific Energy curve drawn at step $1.$ Comment on the positions of the marks.

Theoretically there should be no energy loss between sections $1$ and $2.$ If the difference between calculated values of $E1$ and $E2,$ in step $3,$ is not equal to zero justify your findings.