Tulvasäiliöt

Tulvasäiliöt, also known as storm water retention basins or detention basins, are man-made or natural depressions designed to temporarily store excess rainwater or meltwater runoff. Their primary purpose is to mitigate the negative impacts of urban stormwater, such as flooding and water pollution. When heavy rainfall occurs, instead of immediately overwhelming drainage systems and waterways, the water is directed into the tulvasäiliö.

These structures work by slowing down the flow of water. As water enters the basin, its velocity decreases, allowing sediment and other suspended solids to settle out. This sedimentation process helps to improve the quality of the stormwater before it is gradually released back into the natural drainage system or a receiving body of water. This controlled release also reduces the peak flow rate, preventing downstream flooding.

Tulvasäiliöt can be designed in various ways, including dry basins that are typically empty and fill only during storm events, or wet basins that maintain a permanent pool of water and are designed to accommodate additional storm runoff. They are an important component of urban stormwater management strategies, contributing to both flood control and water quality protection. Regular maintenance, such as sediment removal and vegetation management, is crucial for their effective long-term operation.