Types of Stormwater Drain Systems

Iron grate drain in grass garden field

You cannot control the rainfall in your town or city, but you can control its effects. The runoff after rains can cause considerable water damage to property. A stormwater system is an essential tool to help you manage surface runoff and prevent costly damage.

The systems, best designed by a civil engineering firm in New Orleans, slow down water surges and help to control flooding before the water flows into natural water bodies. Stormwater systems come in different shapes and sizes, designed to imitate natural drainage processes.

Here are some of these systems.

Retention Basins

These hold surface runoff for approximately 72 hours. The retention allows seepage of stormwater through soil into a shallow groundwater aquifer. The grass around your retention basin stabilizes the surrounding slope and filter sediments.

This stormwater drainage solution is a closed system designed not to allow the water to flow into natural water bodies.


These areas allow seepage of water into the ground or other water bodies. These open storm water systems hold water after it rains but are generally dry during other periods. Swales are inexpensive to build and aesthetically pleasing. They are ideal for slopes with a gradient of not more than 5%.

Wet Detention Systems

These “ponds” are the most commonly used. They allow stormwater to settle and be slowly absorbed in the soil for an indefinite period. Part of a wet detention system consists of a permanent pond located below the drain structure’s level.

People sometimes use aquatic plants along its perimeter to filter the sediments in stormwater.

Rain is beneficial, but you should not allow it to destroy your town. With one of the above stormwater drainage systems in place, you are sure your town has adequate protection from water damage. The ideal choice depends on your available land and typical rainfall quantity.