Q$.3$: A $10-$cm$-$high bump in a wide horizontal water channel creates a hydraulic jump just upstream and the flow pattern in Fig. $4.$ Neglecting losses except in the jump, for the case $y_3=30cm,$ estimate $($a$)V_{4,}($b$)y_{4,}($c$)V_{1,}$ and $($d$)$ y$1.$ Known: section $"4"$ is supercritical, assume $"3"$ is critical.