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Ecosol - Drop Trap
The Ecosol Drop Trap is designed to remove and retain solid pollutants conveyed in stormwater runoff from impervious surfaces. The top entry filtration system consists of a pre-cast concrete pit containing a capture basket and overflow by-pass flaps. The unit is typically installed as a top entry system however can also be adapted to either in-line, or at the end of the stormwater line, where there is a drop between the upstream invert and downstream obvert levels of at least 450mm, and preferably more.
This drop is needed so that the structure can house an adequately-sized basket. Solid pollutants conveyed in flows from the upstream pipe or overland surface flows are filtered through the basket positioned directly below the upstream pipe invert or grated access cover at surface level. The filtered stormwater then passes through the unit to the downstream outlet pipe and into the drainage network without any head/hydraulic loss through the unit. As the basket approaches 90% full, the by-pass flaps begin to open in response to the incoming flow. Once the basket is 100% full the pressure of the incoming flow forces open the by-pass flaps, allowing the excess flow, to enter the drainage system through the by-pass openings. This effectively eliminates the likelihood of flooding, a common fault with other systems. Even when in by-pass, there is minimal resuspension of settled pollutants.
When the flow ceases, the flaps return to their normal position (see opposite for a graphical representation of the unit in operation). The Ecosol Drop Trap separates, collects, and retains more than 98% of solid pollutants greater than 3mm in size and it traditionally not installed on drainage lines larger than 600mm in diameter.
The Ecosol Drop Trap has many key features and benefits some of which are listed below.
- Cost efficient and effective at-source primary treatment solution
- Visually unobtrusive, fully self-contained underground system
- Easily maintained by crane or vacuum truck
- Durable, robust product, engineered for the environment in which it operates
