ecoStorm Phase Operation
Working Principle of the ecoStorm Water Quality Structure
Phase 1: Dry weather level.
The ecoStorm utilizes two concentric round structures of varying diameters. Water levels in the inner and outer cylinder are always equalized through a vertical weir opening. The outer cylinder is designed to separate the contaminated particulate (brown) from the drain water. The Inlet pipe with a deflection bend 90 degrees, initiates the counterclockwise, circular flow direction of the stormwater passing through the system. Circular flow patterns extend or increase the time in which it takes for stormwater flow to enter the weir opening and proceed to the equalization chamber. Floating pollutants (red) such as petroleum, litter and organics are pushed through the weir into the floatable containment chamber (inner cylinder).
Phase 2: Routine storm event.
The routine storm event is a rainfall that generates enough energy to transport liquid pollutants, liter and the small, contaminated particles equal to or less than light sand to the storm drain inlets. Once in the storm drainage system, the pollutants are conveyed or delivered to the inlet of the ecoStorm . The system, when sized, will on average, introduce the stormwater at a flowrate that will allow enough detention time in the apparatus to achieve separation for both floating and settling contaminants. During a low flow event the system will display two separate liquid levels. The liquid level differential is a design function or intent of the weir by restricting flow into the equalization chamber.
Phase 3: Intensifying storm.
As storms generate additional intensity, the increased energy allows the stormwater runoff to transport larger, heavier materials with settling velocities that allow separation time to decrease as flowrate increases. Typically any floating pollutants and debris were conveyed at routine storm flow. The captured floating pollutants / debris rise with the internal liquid level.
Phase 4: Design storm.
The "design storm" is a rainfall event that when achieved, has prior to or already flushed or delivered the pollutant load to the ecoStorm. Therefore the separated target pollutants are now segregated from the stormwater energy or flowrates associated with the theoretical assumption that the rainwater through the apparatus now carries little or no target pollutant.
Phase 5: Peak storm.
The peak storm design stage produces the maximum flowrate or stormwater volume each system is hydraulically calibrated or sized to handle or pass. Individual project site and the hydraulic sizing enables an accurately predict the highest liquid level within the apparatus. Pollutants that were introduced and separated at lower storm flows are maintained within the apparatus. The internal flow controls and flow patterns that previously separated now prevents re-suspension and discharge of what the apparatus has accumulated in target pollutants.
Phase 6: Dry weather pump-out.
The frequency of pump-out is based on the site loading, periodic monitoring and measurements of captured pollutant levels in the sediment and floatable containment chambers.