Hydro-Brake Optimum S Type BBA Certficate
BBA Certificate No. 08/4596 for the S-Range of Hydro-Brake® Optimum Flow Controls
Manage low, moderate and high flows to deliver sustainable drainage from single sites to large networks.
The Hydro-Brake® Optimum vortex flow control provides tailored water quantity management for storm, surface, foul or combined water across a wide range of flows and for a variety of applications.
Precision-engineered to meet site-specific flow, head and storage requirements. Only the Hydro-Brake® Optimum leverages more than 40 years of vortex flow control expertise to deliver exceptional flood protection and sustainable drainage.
The Hydro-Brake® Optimum vortex flow control provides tailored water quantity management for surface, foul or combined water across a wide range of flows and for a variety of applications.
Self-activated and precision-engineered to meet each site or network's specific flow, head and storage requirements. The Hydro-Brake® Optimum delivers effective protection from upstream and downstream flooding as a part of a sustainable drainage system (SuDS).
With no moving parts and no power requirements, the Hydro-Brake® Optimum provides reliable, low-maintenance, and engineered flood management as part of green infrastructure developments.
A range of alternative fittings and installation options to meet most site configurations are available for Hydro-Brake® Optimum.
For peace of mind, the performance, strength and durability of the Hydro‐Brake® Optimum has been independently assessed, approved and certified by both the BBA (Certification no. 08/4596) and the WRc Certification no. PT/503/0422) to control stormwater or combined flows.
Every Hydro-Brake® Optimum flow control is individually designed, sized and precision-engineered to meet the specific requirements of the site, network and environment in which it is installed, enabling engineers to deliver tailored protection against upstream and downstream flooding.
Specify SuDS, LID and green infrastructure projects with built-in protection against storm events, management of everyday surface water runoff and capacity for the future effects of climate change.
You can even design your flow control online with the online design tool.
With a maximum flow of up to 550 l/s / 8717.7 gpm and a maximum storage area of up to 275 ha* the Hydro-Brake® Optimum provides effective, reliable flow control across a wide range of environments and applications, from small individual plots to large sewer networks, giving designers the flexibility to implement a range of sustainable drainage and green infrastructure projects.
The Hydro-Brake® Optimum provides complete freedom in the response characteristic of the flow control. For a given maximum design head and flow, the point at which the vortex begins can be specified, enabling engineers to tailor flow controls to solve even the most challenging requirements.
Having been independently evaluated, tested, approved and certified by the BBA (Certification no. 08/4596) and the WRc (Certification no. PT/503/0422), customers can be confident that every flow control meets rigorous quality, performance and installation standards.
Hydro-Brake® Optimum has options for a range of alternative fittings / installation options to meet most site configurations.
* Assumes an average of 2 l/s / 31.7 gpm per ha
Hydro-Brake® Optimum flow controls are self-activating, relying on upstream hydraulic head to generate an air-filled vortex within the middle of the casing. The flow control moves through three distinct phases of operation:
Under low flow conditions the flow control behaves like an oversized orifice. The flow is gentle, with minimal turbulence inside the volute of the flow control or the outlet pipe. As the water level starts to increase above the soffit of the outlet, air becomes trapped in the volute. This exerts a back pressure against the water and begins to restrict the cross-sectional area available for water flow.
As the water depth continues to increase, a vortex begins to form within the unit and the entrapped air forms the central core. At first there is not enough energy in the water flow to sustain a stable vortex, so the vortex will continually start to build and collapse.
The head at the end of this phase is the point at which there is sufficient energy within the flow to sustain a stable vortex.
A stable vortex is maintained within the flow control. High peripheral velocities around an aerated core create a back pressure, which effectively chokes the flow through the outlet aperture.
Following initiation of the vortex, the flow control restricts the flow in a similar fashion to an orifice, but with clear openings up to 600% larger, significantly reducing the risk of blockage.
As the water level subsides, the energy within the flow reduces and the vortex collapses. Air is drawn into the volute and the flow control returns to operating in a similar manner to an oversized orifice. This drains the system quickly and more effectively, so that the flood storage reservoir is ready for the next event.
See it in action:
Maximum flow: 550 l/s / 8717.7 gpm
Maximum head: 4.0 m / 13.12 ft
Approximate maximum storage area: 275 ha*
*Assumes an average of 2 l/s / 31.70 gpm per ha
Matching the Flush-Flo™ point equal to the design point means that the device will be as hydraulically efficient as possible, leading to more water passing through the unit during the earlier stages of a storm, thus reducing the amount of water that needs to be stored upstream.
Reducing the Flush-Flo™ point reduces the size of the device, so if the exact available space is known then the Flush-Flo™ point may be tuned to give the most hydraulically efficient performance within the space available.
Custom Flush-Flo™ points can be specified, enabling the design of precise ‘complex flow control’ arrangements where the pre-developed hydrology is aligned to the post-developed site.
There are now a variety of industry guidance documents applied at national and regional levels and they are not totally consistent in terms of their stance on minimum flow rates or minimum flow control sizes.
The approaches range from BS8582:2013, which states “controls smaller than 25 mm are possible if protected [from blockage]” up to the advice given by water companies, which can set a minimum acceptable opening size for adoptable flow controls for surface water only systems of >50 mm for protected orifices and >100mm for unprotected orifices.
> Request a UK 3D model of the Hydro-Brake® Optimum for use with UK Building Information Modelling (BIM)
BBA Certificate No. 08/4596 for the S-Range of Hydro-Brake® Optimum Flow Controls
BBA Certificate No. 08/4596 for the C-Range of Hydro-Brake® Optimum Flow Controls
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All vortex flow controls need to maintain a downstream clearance in order to allow the vortex to fully form, and within this clearance no valves, controls or other devices should be installed, and no pipe bends or changes to pipe diameters should be made. This clearance is typically around 3 m / 9.84 ft or ten times the outlet diameter of the unit, whichever is greater.
Yes, but an air vent pipe may be required to ensure that the air core can form. The flow through a Hydro-Brake® Optimum flow control depends on the size of the unit itself and the differential head of water acting upon it. Please contact us for further information.
The door is intended to allow an emergency drain down of the manhole chamber or tank in case of a blockage at the inlet of the unit. It can be operated from the surface, allowing the chamber to be emptied prior to freeing the blockage from the inlet of the unit. On release of the pull cable, the door will close under its own weight and does not require any mechanism that may contribute to debris being caught around the unit.
Maintenance will be dependent on the site, the size and characteristics of the flow control, the nature of the influent and any physical characteristics of any control chamber.
Each site has different existing and future flood alleviation and protection requirements, so the size, design and number of flow controls will depend on site-specific design parameters. We are able to provide design, guidance and advisory support in this area.
Use our Online Design Tool to precisely engineer a Hydro-Brake® Optimum flow control to meet your specific site requirements.