A unit width rectangular channel shows $y_1=2\mathrm{.}2m$ and $y_2=1\mathrm{.}6m$ due to a step rise between section $1$ and $2.$

The specific energy curve $(y$ vs$.E$ curve$)$ was computed for section $1$ in the graph.

From this information, answer the following questions. Write answers up to one decimal place. Please don't write the unit

for fullly automatic grading for these questions.

$(1)$ What is the flow rate $(cms)?$

$(2)$ What is the step rise $(\backslash$Delta z in m$)?$

$(3)$ What is the maximum possible step rise $($m$)?$