# Natural Hazard Risk Assessment

Description

Finish the file attached.The building address selected is 5880 Fair Isle Dr, Riverside, CA.Follow the instructions of these videosSection II: Flood https://nv.instructuremedia.com/fetch/QkFoYkIxc0hh…Section III: Liquefactionhttps://nv.instructuremedia.com/fetch/QkFoYkIxc0hh…Section III: Landslides and other Mass Movementshttps://nv.instructuremedia.com/fetch/QkFoYkIxc0hh…Section IV: Coastal Erosionhttps://nv.instructuremedia.com/fetch/QkFoYkIxc0hh…

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Natural Hazards & Disasters
NAME:
Project, Part 2: Risk Assessment
*** NOTE: YOU MUST READ ALL DIRECTIONS TO SUCCESSFULLY COMPLETE THE PROJECT ***
I. Introduction
For your final project, imagine you are an emergency manager, property insurance agent, or simply
a concerned property owner. In this role, you are to use a series of maps and natural hazard data
to evaluate the risk to a building structure of your choice in the state of California (Note: the
building cannot be associated with a UC or any homes, apartments, or dorms near a UC. If you
As a responsible assessor, you need to be aware of the exposure risk to the building. For each
hazard, you will rate the potential risk in two dimensions:
(1) Probability – The probability that a hazardous event “may” occur, can range anywhere from
0 to 1 (or, changing 0 and 1 to percentages, you can think of these values as 0% to 100%).
Note, the probability can never be 0 (there is always some chance that a hazard may occur)
or 1 (cannot be absolutely certain a hazard will occur).
o You will assess the probability that a hazard will affect your building based on the
proximity (distance) of previous, historic hazards that have occurred near your
building
o First, you will examine the mapped data and determine the probability: Low (not
likely to affect your building), Medium, or High (most likely to affect your building).
o Then, you will assign a numeric value to the probability, such as Low: 0.1 – 0.3,
Medium: 0.4 – 0.6, High: 0.7 – 0.9.
(2) Severity of Impact – A risk, by its very nature, always has a negative impact. However, the
size of the impact varies in terms of cost and impact on health, human life, or some other
critical factor. The severity of impact ranges in value from 1 (negligible) to 10 (critical).
o You will assess the severity of the hazard to your building based on the extent
(danger level) of previous, historic hazards that have occurred.
o First, you will examine the mapped data and determine if the impact severity to your
building is Low (negligible impact, little damage), Medium, or High (significant
impact, major damage).
o Then, you will assign a numeric value to the severity, such as Low: 1 – 3, Medium: 4
– 6, High: 7 – 10.
After assessing the probability and severity of the hazard to the building, you are to create a chart
representing the probability and severity of natural hazards affecting your building.
II. Rivers, Floodplains, and Artificial Channel Structures
Use the Project, Part 2 WebGIS to answer the questions below.
Project, Part 2 – Risk Assessment, pg 1
Natural Hazards & Disasters
1. Turn off all layers except the rivers and streams, water bodies, and floodplains layers. Type
webmap’s location pop-up window open to “point” to the location of your building, then zoom
out until the nearest river(s), water body(ies) and floodplain(s) are within the map extent. Print
(or take a screengrab of) the map as a landscaped image and copy/insert the map image into
the space below.
2. Measure the distance from your building to a large nearby river (remember units!):
3. Give the name of that river:
4. How many floodplains are within 10 mi of your building?
5. If you answered ‘0’ to the previous question, answer this question, otherwise, skip this question.
How many floodplains are within 20 mi of your building?
6. If you answered ‘0’ to the previous question, answer this question; otherwise, skip this question.
How many floodplains are within 30 mi of your building?
7. Turn off all layers except the dams, levees, and dam areas layers. Type your building’s address
into the webmap search bar to zoom in to your building. Leave the webmap’s location pop-up
window open to “point” to the location of your building, then zoom out until the nearest dams,
levees, and dam area is within the map extent. Print (or take a screengrab of) the map as a
landscaped image and copy/insert the map image into the space below.
8. Investigate the dams areas layer. Your building is in an area that (is)
Above /
Below
/
Contains a dam.
Project, Part 2 – Risk Assessment, pg 2
Natural Hazards & Disasters
9. How many dams are within 10 mi of your building?
10. If you answered ‘0’ to the previous question, answer this question, otherwise, skip this question.
How many dams are within 20 mi of your building?
11. If you answered ‘0’ to the previous question, answer this question; otherwise, skip this question.
How many dams are within 30 mi of your building?
12. Consider the dams near your building. The closest dam to your building is
Large /
Medium /
Small capacity.
(view Capacity field (in acre feet),
(consider presence of features in coastal armoring layer, see structure and material fields)
33. For these erosion problems, were beach re-nourishment practices used?
Yes /
No
(consider presence of features in beach re-nourishment projects layer)
34. For these re-nourishment projects, were a majority of onshore/nearshore (e.g., harbors, bays,
rivers, etc.) or offshore sand sites used?
Onshore /
Offshore /
Not applicable (answered No to previous question)
(view beach re-nourishment projects layer, see fill source field)
35. Complete the risk assessment table for your building with regards to coastal erosion.

If coastal erosion has occurred near your building ( 15 mi) then the probability is low. Investigate the data and assign a numeric probability
value, such as low (0.1 – 0.3), medium (0.4 – 0.6), or high (0.7 – 0.9) (see directions on first
page and first table footnotes).
Investigate the data (e.g., number and extent of identified erosion problem areas, number and
extent of armoring structures and re-nourishment projects) and consider the severity, or
potential damage, from coastal erosion. Decide whether the impact to your building would be
low, medium, or high. Then, assign a numeric value based on your low (1-3), medium (4-6),
or high (7-10) description.
Hazard1
Probability2
Severity3
Risk4
V. Plot
Complete the chart of the two measures your assessed in this exercise: probability and severity.
As an emergency manager, insurance assessor, or home owner, this chart will give you a quick,
clear view of the priority that you need to give the evaluated hazards.
36. Create a scatter plot showing the probability (y-axis) and severity (x-axis) you determined for
each hazard (including the hazards from Part 1). For example, a probability of 0.2 and a
severity of 1 will plot at y=0.2 and x=1 in the lower left portion of the graph. Create a legend on
the right side of the plot explaining which points belong to which hazard. Hint: One way to
make a legend might be to have each point (each hazard) be a different color.
Remove the empty plot and copy/insert your completed plot in the space below.
Project, Part 2 – Risk Assessment, pg 7
Natural Hazards & Disasters
37. Create a bar in the graph representing the risk value you calculated for each hazard (including
the hazards from Part 1). For example, for a volcanic risk of 0.2 draw a bar above the
“Volcanoes” label that reaches up to 0.2 on the y-axis.
Remove the empty plot and copy/insert your completed plot in the space below.
38. Investigate your two plots. List the three greatest hazards to your building.
Project, Part 2 – Risk Assessment, pg 8
Natural Hazards & Disasters
39. What is the greatest hazard to your building?
• What factors (i.e., data) lead you to determine that this hazard posed the greatest risk to
• What can be done to protect your building from this hazard?
• How might you personally prepare for and respond to this risk?
Use all the data and information you have gathered from the WebGIS site, lecture, and textbook.
You will be graded on the quality of your response and the clarity with which you communicate
40. What is the second greatest hazard to your building?
• What factors (i.e., data) lead you to determine that this hazard posed the greatest risk to
• What can be done to protect your building from this hazard?
• How might you personally prepare for and respond to this risk?
41. What is the third greatest hazard to your building?
• What factors (i.e., data) lead you to determine that this hazard posed the greatest risk to
• What can be done to protect your building from this hazard?
• How might you personally prepare for and respond to this risk?
Project, Part 2 – Risk Assessment, pg 9
Natural Hazards & Disasters
Project, Part 2 – Risk Assessment, pg 10

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Natural Harzard

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