Temporary storage reservoirs are useful in flood prevention during periods of heavy rainfall or seasonal wet conditions. These systems have benefits but also significant drawbacks, such as environmental and social impacts, which must be considered carefully.
Temporary storage reservoirs are appropriate for actively preventing floods when there are heavy rains leading to swollen rivers, or during seasonal wet periods where excess water can be captured and stored for future use. In addition to aiding in flood control, these reservoirs can provide benefits like water supply for urban areas, hydroelectric power, and recreational opportunities.
However, they may have drawbacks such as the buildup of silt, which can displace water and render the dam less effective, ecological habitat flooding, and interference with fish migration. Moreover, operational and maintenance challenges can turn into dangers if not properly managed, and the impact on local communities and ecosystems can be considerable, as seen in the loss of forest habitats and the effects on indigenous people's lands.
In conclusion, while temporary storage reservoirs offer a method to prevent floods and manage water resources, their use requires careful consideration of the environmental, social, and long-term sustainability issues that accompany their creation and maintenance.