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FlowBrake stormwater flow control devices
The purpose of SuDS attenuation flow control is to limit the peak discharge generated from a development site during a storm in order to prevent flooding downstream. The difference between the inflow and outflow during the storm determines the balance of storage volume required. The SuDS attenuation volume assesment is typically a planning condition.
Flow Control devices/regulators fall into one of the following categories:
Orifice Flow Regulator : An orifice, as the name suggests, is a simple hole which throttles the flow. The outflow is dependent on the height of water acting on the orifice also referred to as the driving head. Typically these are suitable on larger sites as it difficult for an orifice to achieve low flow without resulting in a small diameter which may result in blockage. They maybe suitable for sites which have upstream screening or debris management which limits the blockage risk to the orifice.
Floating Orifice Flow Regulator: The elegance of the floating orifice is that the head above the orifice is fixed and so the outflow is fixed and unrelated to the inflow (after initial filling). The added benefit is that since the orifice sits below the water surface, the orifice is not subject to blockage from floating debris. Likewise a floating orifice can be much larger than a standard orifice, since the head does not vary, and so blockage risk is reduced.
Vortex Flow Regulator: This type of device generates a vortex in the outflow of the water. This vortex in turns impedes the outflow. The benefit of this type of device is the inlet to the vortex can be quite large compared to a standard orifice . For example the outflow diameter on a vortex flow could be twice that of a standard orifice but still generate the same outflow or allowable discharge. A larger opening reduces the blockage risk. FlowBrake is an example of a a Vortex Flow Regulator.
Submersible lift pump: In some cases a restricted gravity discharge cannot be achieved to a sewer and so flow control can be achieved by using a variable speed submersible pump which can be calibrated on site. Alternatively a standard submersible pump can be used which feeds a chamber with flow control downstream. On site commissioning should be performed to ensure the downstream chamber does not surcharge (overflow).

FlowBrake SuDS Attenuation Tank Orifice Plate
£29.00
As the name suggests the FlowBrake Orifice allows a simple orifice control and is suitable in situations where a varying a peak discharge condition is permitted. The orifice plate is fabricated from PVC and the orifice designed and fabricated in accordance with BS1042 and can simply be placed within any standard 110mm/160mm socket, 110mm/160mm t...

FlowBrake SuDS Attenuation Tank Floating Outflow Regulator with strainer
£59.00
FlowBrakeTM fixed head orifice SuDS flow regulator with strainer. If you require a SuDS flow regulator with an open orifice please see this product. This product is suitable were there is no or low upstream filtration. Turn any tank into an attenuation tank using this smart device. The floating intake ensures there is a fixed level of water...

FlowBrake SuDS Attenuation Tank Floating Outflow Regulator (Open Orifice)
£99.00
FlowbrakeTM fixed head open orifice SuDS flow regulator. If you require a SuDS flow regulator with a strainer please see this product. This product is suitable were there is an upstream filtration (basket filter) present since no filtration is provided at the orifice. Turn any tank into an attenuation tank using this smart device, a simple alt...