Name ________________________________
Chapter 13 Investigation Worksheet, page 1
To complete this worksheet, see the instructions in the textbook (Chapter 13 Investigation).
Table 1: Discharge Calculations
Profile
Event
Fill the notch and flood the bottomland
Additional needed to flood middle terrace
Total needed to flood middle terrace
Width
(m)
9m
51 m
Depth
Velocity
(m)
(m/sec)
5m
0.7 m/sec
3m
2.0 m/sec
Add discharges from above
Calculated Discharge
m3/sec
Table 2. Discharge Data and Graph
Plot your calculated discharge results on this graph. First find the position of that discharge on
the vertical axis of the graph. Draw a horizontal line from that value to the right until you
intersect the probability line (which slopes from lower left to upper right). From the point of
intersection, draw a vertical line down to the horizontal axis of the graph and read off the
corresponding chance of exceedance (probability of flooding) on the horizontal axis. The chance
of exceedance indicates the probability of that amount of discharge being exceeded in any given
year. Read off the probability associated with each discharge and enter it below.
Probability to fill notch: _________________________
Probability to flood middle terrace: _________________
Chapter 13 Investigation Worksheet; page 2
Table 3. 3D Perspective of River
On the figure above, draw your proposed locations for agricultural fields (draw a small square)
and five possible homesites for a house (use a circle or simple house symbol). After completing
your discharge calculations, rank the five homesites in order of your final preferences, with 1
being your top choice.
Table 4. Explanations for Why You Chose Your Locations
Agricultural fields:
Homesites:
Briefly describe how the probability results affected your ranking of homesites:
Chapter 13 Investigation Worksheet; page 2
Table 5. Multiple-Choice Questions for chapter 13 Investigation
Question
Answers
The lowest notch shown on this figure is 9 meters wide and 5
a) 5 m3/sec
meters high from its base. The river has a velocity of 0.7 meters b) 9 m3/sec
per second when it fills the notch. The calculated discharge for
c) 9.5 m3/sec
filling the notice is:
d) 31.5 m3/sec
e) 45 m3/sec
The lowest notch shown on this figure is 9 meters wide and 5
meters high from its base. The river has a velocity of 0.7 meters
per second when it fills the notch. Based on the accompanying
graph, what is the probability each year that the notch will be
filled to the top?
a) between 0 and 2 percent
b) between 3 and 5 percent
c) between 40 and 70 percent
d) between 70 and 95 percent
e) greater than 95 percent
Assuming the notch is already filled, calculate the additional
discharge needed to flood onto the middle terrace. The middle
terrace shown on this figure is 51 meters wide and 3 meters
high from its base. The river has a velocity of 2.0 meters per
second when it fills the middle terrace.
a) 9m3/sec
b) 45m3/sec
c) 51 m3/sec
d) 153.5 m3/sec
e) 306 m3/sec
Chapter 13 Investigation Worksheet; page 2
The middle terrace shown on this figure is 51 meters wide and 3
meters high from its base. The river has a velocity of 2 meters
per second when it fills the middle terrace. Based on the
accompanying graph, what is the probability each year that the
middle terrace will be filled to the top?
a) between 0 and 5 percent
b) between 5 and 10 percent
c) between 10 and 50 percent
d) between 50 and 95 percent
e) greater than 95 percent
Choose the location that you think is represents a point bar
along a river.
a) Location A
b) Location B
c) Location C
d) Location D
e) Location E
Choose the location that you think represents an area too dry for
agriculture.
a) Locations A and C
b) Locations B and E
c) Location D
Chapter 13 Investigation Worksheet; page 2
Choose the location that you think is represents a cut bank along a) Location A
a river.
b) Location B
c) Location C
d) Location D
e) Location E
In this landscape, choose the location that you think would be
best for agricultural fields. Remember to factor in how
migration of meandering may change the position of the river
over time.
a) Location A
b) Location B
c) Location C
d) Location D
e) Location E
In the landscape pictured here, choose the location that you
think would be best to put your house.
a) 1
b) 2
c) 3
d) 4
e) 5