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SuDS Attenuation Flow Control Regulators
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 restricted gravity discharge cannot be achieved to a sewer and so flow control can be achieved by using a variable speed submerible 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).
Oriflo Flow Control Chamber P Series

Oriflo Flow Control Chamber P Series
£409.00
The P models are classed as unprotected orifice chambers and are specifically designed for installation downstream of pre filtered surface water run offs ie. permeable paving and cellular/crate attenuation systems. Designed to support SuDS management and the sewer infrastructure as part of a designed attenuation system, helping prevent flooding ...

FlowBrake SuDS Attenuation Tank Floating Outflow Regulator with strainer
£24.99
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 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 socket, 110mm/...
Vortiflo Vortex Flow Control Chamber

Vortiflo Vortex Flow Control Chamber
£2,889.00
*POA, head and flow required to price correctly* **Please not these are built to order - lead time 15-20 working days** ***The Vortiflo range is not supplied with a cover*** Vortiflo Vortex Flow Control Chambers are specifically designed for controlling the flow of storm water from large volume attenuation systems, preventing downstream flooding...
SuDS drainage Variable Orifice Choke Drain Chamber

SuDS drainage Variable Orifice Choke Drain Chamber
£469.00
Orifice Flow Control is a form of flow control used commonly in SuDS applications. Orifice flow control chambers are used at the most downstream point of a SuDS drainage system to throttle the flow. Where an orifice is less than 40mm it is typicall to use silt and debris contro upstream of the SuDS feature. Features and benefits: Chok...

SuDS Attenuation Tank Floating Outflow Restrictor 0.05-2l/s (Open Orifice)
£299.00
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 Platin or Carat tank into an attenuation tank using this smart device, a simple alternative to other more complex attenuatio...
Stainless Steel Vortex Flow Control Device

Stainless Steel Vortex Flow Control Device
£919.00
*Please note these are built to order - lead time 10-15 working days* *Curved mounting price assumes 1200mm chamber or smaller. For larger chambers, flows or head please get in touch* Vortex Flow Control devices are devices used downstream of attenuation systems. They operate by generating a vortex flow path within the device which in turn impe...

SuDS attenuation lifting pump set
£189.00
Occasionally storage required for SuDS attenuation can not be provided in such away which allows gravity drainage to the surface water drain. In this case a pump will be required to lift the water from the attenuation storage to the a point of free gravity discharge into the sewer. This submersible pump can be a arranged with a downstream flow...

FlowBrake SuDS Attenuation Tank Floating Outflow Regulator (Open Orifice)
£59.99
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...
Oriflo Flow Control Chamber C Series

Oriflo Flow Control Chamber C Series
£829.00
The ORIFLO C series is a protected orifice plate unit, designed to support SuDS management and the sewer infrastructure as part of a designed attenuation system, helping prevent flooding by controlling the flow into the main sewer. Applications: Typically installed downstream of larger attenuation tank and oversized pipe systems, forming the fin...
FlowBrake® mini SuDS Attenuation Vortex Flow Chamber

FlowBrake® mini SuDS Attenuation Vortex Flow Chamber
£499.00
FlowBrake® mini. "Slow the Flow" SuDS Attenuation Variable Vortex Flow Regulator Chamber. FlowBrake mini is the world's first compact, lightweight variable flow attenuation vortex regulator. Conventional vortex flow regulators are big, bulky, expensive and cannot regulate discharge at low flow values which are typically a requirement on small...

Vortex flow control shaft VS-Control flex M
£1,099.00
The vortex flow control shaft can regulate flows of up to 65 l/s. The vortex flow control shaft VS-Control External is ideal for retention systems fitted with EcoBloc elements or retention tanks. Continuously variable installation depth of 985 mm – 6500 mm (38.8" – 21' 4") Minimal height offset between the inlet and the outlet (315 mm (12.4") V...