Objective: $(10$ questions at $1$ point each$)$

The primary mechanism for sustaining flow in an open channel is gravitational force, whet sersmeser represents this gravitational effect. $(V\frac{2}{2}g)$ defines the energy grade line which is also referred to as:

This refers to an open channel's section which can pass the greatest quantity of flowy for any guon anes of$,$ water depth, Triangular channel; side slopes $=45,$ Trapezoidal channel; slde slopesim $60$

Rapidly$-$varied flow is a significant change in water depth over a short distance $($a few times warer terph, t$)$ occurs where there is a local disturbance to the balance between gravity and friction $($e$.$g$.$ at a wei, ventim, fhine, free overfall, sudden change in slope$)$ or a mismatch between the depths imposed by ucstican and dowrionder controls $($hydraulic jump$).$

A$.$ Only the first statement is true for RVF

B$.$ All statements are true for RVF

C$.$ Only the second statement is true for RVF

D$.$ All statements do not describe RVF