What is the minimum velocity needed for a 0.8 mm sand particle ...

[abern]

What is the minimum velocity needed for a 0.8 mm sand particle transition from a state of deposition to transportation?
 
  A) 5 cm/sec
  B) 1 cm/sec
  C) 15 cm/sec
  D) 23 cm/sec

Question 2

Using the information provided above, describe what changes will happen to the stream and its streamflow as the water moves from the head to the mouth.
 
  A) The channel roughness and slope decrease while the discharge, channel size, and flow velocity increase
  B) The channel size increases, which forces the flow velocity and discharge to decrease
  C) The channel roughness and slope increases while the discharge, channel size, and flow velocity decrease
  D) As the flow and channel size increase, so, too do the slope and roughness

[Joy Chen]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: C