Manage low, moderate and high flows to deliver sustainable drainage from single sites to large networks.
The Hydro-Brake® Optimum vortex flow control provides customised 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 30 years of vortex flow control expertise to deliver exceptional flood protection and sustainable drainage.
The Hydro-Brake® Optimum vortex flow control provides customised 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 part of a sustainable drainage system (SuDS).
With no moving parts and no power requirements, the Hydro-Brake® Optimum provides reliable, low-maintenance, 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.
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 Hydro-Brake® Optimum online design tool.
With a maximum flow of up to 550 l/s 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/409/0417), customers can be confident that every flow control neets 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 per ha
Hydro-Brake® Optimum flow controls are self-activating, relying on upstream hydraulic head to generate an air-filled vortex within the centre 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.
Maximum flow: 550 l/s
Maximum head: 4.0 m
Approximate maximum storage area: 275 ha*
*Assumes an average of 2 l/s 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.