Hydrodynamic separator

HDS are considered structural best management practices (BMPs), and are used to treat and pre-treat stormwater runoff, and are particularly suitable for highly impervious sites, such as roads, highways and parking lots.

[2]: 1  Along with supplemental features to reduce velocity, an HDS system is designed to separate floatables (trash, debris and oil) and settleable particles, like sediment, from stormwater.

These programs include lab and field testing and provide specific sizing criteria for hydrodynamic separation systems.

the Environmental & Water Resources Institute (a component of the American Society of Civil Engineers) and ASTM International are developing comprehensive verification guidelines and standard test methods for assessing the performance of these devices.

[1] According to the U.S. Environmental Protection Agency (EPA), "Catch basin inserts may be more suitable when available land is limited, such as in urbanized areas.