Determining the Average Velocity of a Stream

For each of the four layers use the stop watch to time the movement of particles from one post to the other. The wooden posts are 5.0 meters apart. (Some of the values have been measured and recorded for you.)

Make each measurement twice to the nearest 0.2 seconds. Record your data in the table below. Then record the average of the two times.

Fraction of Depth	Time 1 (sec)	Time 2 (sec)	Average Time (sec)
0.1 D
0.4 D
0.6 D
0.8 D