2. Risk Assessment in Various Contexts

In this lecture, we will talk about disaster risk considering 3 components; one is hazard, exposure, and vulnerability. So, we will give some small examples; illustrations with some theoretical ideas to define the very core aspect of disaster risk.

Disaster risk can be understood by examining three key components: hazard, exposure, and vulnerability. A hazard refers to an event that can cause harm, such as a landslide or earthquake. Exposure relates to the presence of people or assets in the area affected by the hazard. Vulnerability indicates the degree to which a community or system can withstand the impacts of the hazard. For example, if a community is exposed to earthquakes but has buildings that are designed to withstand them (low vulnerability), the overall risk might be lower.

Think of a neighborhood that experiences flooding. If the houses are built on stilts (low vulnerability), even if they are located in a flood-prone area (high hazard, high exposure), they are less likely to suffer severe damage. This context helps illustrate how hazard, exposure, and vulnerability interact to create disaster risk.

Let us imagine that this is a place near Roorkee in Uttarakhand; it could be a tourist spot, people coming here watching this mystic stone in a mountain well now, considering this slide is it risky? Does it look like that this could be fatal for the people, should you consider this is as disaster or disaster risk?

The location of a specific hazard, such as a loose stone in a mountainous tourist area, can influence its perceived risk. If the stone is in a remote area with no one around, the risk is low; however, if tourists are present, the risk becomes more significant since there is a chance of injury or fatality. This example illustrates how location and the presence of people affect risk assessment.

Imagine a picturesque waterfall that attracts visitors. If it’s a sunny day and many people are nearby, the potential for an accident increases. However, on a rainy day, when fewer people are around, the risk diminishes, highlighting how the scenario changes based on human presence and environmental context.

Now, look at the next slide, so if there is a rain then, there is a possibility that this stone would hit this person so yes, we consider this is as risky.

Environmental changes such as rainfall can increase the risk associated with a hazard. In the example givenwhere the stone may fall due to rain, it introduces a new variable that heightens the likelihood of an accident occurring. This scenario emphasizes the need to constantly reassess risk as environmental conditions change.

Imagine a picnic under a tree on a sunny day; it feels safe. However, if a storm approaches and starts to rain, the risk of branches breaking and falling increases. This change in weather updates our perception of risk and reminds us that we must be vigilant about the conditions around us.

But if this same thing is happening in an urban place in a city area what happens?

The time of day can also play a crucial role in assessing risk. For example, a landslide occurring at night when people are asleep presents a higher risk compared to the same event during the daytime when more people are active and alert. This chunk highlights the importance of considering both temporal and spatial factors when evaluating disaster risk.

Think about a fire alarm at a workplace. If the alarm goes off during regular office hours, most employees can evacuate quickly. However, if the alarm sounds late at night when the building is mostly empty, the situation becomes far more dangerous because fewer people are alert to the risk.

--