14.3.2. Pressure Conditions

Try these first

1. 1.

   Define open channel flow.

   Hint

   Think about what defines a surface in water flow.

2. 2.

   What are the two main forces in open channel flow?

   Hint

   Consider the forces acting on the water in the channel.

3. 3.

   What is the pressure at the free surface of an open channel flow?

   • Internal pressure
   • Atmospheric pressure
   • No pressure

   Hint

   Consider what type of pressure affects the top of the water.

4. 4.

   In open channel flow, what forces primarily act on the fluid?

   • True
   • False

   Hint

   Reconnect with the key forces discussed in class.

5. 5.

   Given a trapezoidal channel with a bottom width of 5 m, side slopes of 2:1, and a flow depth of 3 m, calculate the hydraulic radius.

   Hint

   Use trapezoidal area and perimeter formulas to find R.

6. 6.

   Analyze the effect of increasing friction on open channel flow velocity. How would this change relate to flow conditions?

   Hint

   Consider how surfaces affect water movement and the implications for channel designs.