Drought disaster: intensity (without unit) - return period 100 years

Hazard maps are a useful decision-making tool, as they do not represent a single event that is likely to occur but rather illustrate the effects of all events that may occur in the future. They also make it possible to compare danger levels with different return periods and to establish sites that are more or less conducive to drought. These maps are a valuable tool for measuring and communicating hazards. For example, land use regulations or irrigation systems can be better designed for the territory by taking into account appropriate drought knowledge. Drought indicators Indices are widely used to identify droughts. By detecting below-average rainfall conditions and above-average temperatures, the indices can define the duration and severity of drought events. Droughts occur when the index falls below a predefined threshold and are characterized by their severity and duration. Drought severity is the area under the event curve (the cumulative index value during the event) and drought duration is the duration of the event. The relationship between severity and duration is the intensity of the drought (Mishra and Singh, 2010). Drought intensity is very useful because it provides a standardized measure of the event, which makes it possible to compare different events (which can have different severity and duration) because it represents the unit intensity of the event.