A flood drainage channel, has the shape presented in the figure. It is made of unfinished concrete and has a slope of 0.5%. During normal times, water flows through the small rectangular section. The upper section allows the channel to carry large volumes of rainwater if necessary. Determine the normal discharge for depths of 0.5m and 2.5m. For each condition, define whether the flow is critical, subcritical, or supercritical.

Please solve the problem in an orderly manner.

0.5 m 1.0m 0.6 m 2 25 m