Design Tool
Hydro-Brake Optimum Design Tool
Design your Hydro-Brake® Optimum flow control online. Our online design tool allows you to design and specify Hydro-Brake® Optimum flow…
Flow control and flood protection
Hydro-Brake Optimum
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.
Design your Hydro-Brake® Optimum online. Log in or sign up to the free online tool: hydro-int.design
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.
Our most popular Hydro-Brake® Optimum, the Hydraulically Efficient unit incorporates an adjustable inlet as standard. This will allow engineers to future-proof their drainage designs with up to a plus or minus 20% change in design flow, should additional developments or urban creep cause an increase in flows, saving the cost of a replacement flow control. Watch the video to find out why picking the right flow control is so important to regulating water flows and why we’ve added the new future-proof feature on our most popular Hydro-Brake® Optimum vortex flow control.
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Find out more about the adjustable inlet here.
Download our eguide detailing the full range of design options.
To help meet most site configurations, a range of alternative fittings and installation options, including the new XP Fit to Outlet Pipe option, are available for Hydro-Brake® Optimum.
Independently assessed, approved and certified
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.
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Only Hydro-Brake® Optimum:
- Is individually custom-designed to meet specific site and network requirements
- Draws on a legacy of more than 40 years of vortex flow control technology
- Is designed and delivered by the leaders in flow control
Get custom-designed, precision-engineered flood protection
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 our online design tool.
Built-in future proof adjustability
Standard, Hydraulically Efficient, Hydro-Brake® Optimum units are supplied with an adjustable inlet, allowing post-installation flow adjustments without the need to replace the whole device. Find out more about the adjustable inlet here.
Deliver small, medium or large-scale sustainable drainage
With a maximum flow of up to 550 l/s (8,717.7 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.
Design with complete freedom
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.
Independently assessed, approved and certified
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.
Meet difficult site configurations
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:
Low Flow
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.
High Flow
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.
Drain Down
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:
Video file
Performance Characteristics
Maximum flow: 550 l/s / 8,717.7 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
> Design your Hydro-Brake® Optimum online - try the online design tool at hydro-int.design
Download our eguide detailing the full range of design options.
Custom Performance Options
(HE) Minimise upstream storage
Our most popular and highest performing unit, the HE design objective is optimised to minimise the upstream storage.
The design curve for the HE Hydro-Brake® Optimum units will match the Flush-Flo™ point as close as possible to the design point, which means that the device will pass foward as much flow as possible during the earlier stages of a storm, reducing the amount of water that needs to be stored upstream.
Future-proof feature on surface water HE units
Surface water (S-Type) HE Hydro-Brake® Optimum flow controls are now fitted with an adjustable inlet as standard. This enables engineers to future-proof their design with up to a plus or minus 20% change in design flow should additional developments or urban creep cause an increase in flows, saving the cost of a replacement flow control.
The minimise upstream storage (HE) design objective is the default option in our Online Design Tool and with the design flow and head entered, the tool will return an S-type HE unit with a unique triple hydraulic design characteristic showing the adjustment range. A unique triple flow head/discharge curve is generated by the Online Design Tool for these units. Find out more about the adjustable inlet here.
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- The blue line is the original setting and how the Hydro-Brake® Optimum will be supplied. This remains the most hydraulically efficient setting for the given design flow and head and is the same as any previous HE specifications.
- The dashed green line is the minimum setting which is when the inlet is at its most restricted, providing the lowest flow rate possible for the Hydro-Brake® Optimum.
- The dashed red line is the maximum setting which is when the inlet is at its most open, allowing the largest amount of flow to pass through the Hydro-Brake® Optimum.
Hydro-Brake® Optimum for foul / combined flows
For foul or combined flows a Conical (C-Type) Hydro-Brake® Optimum will be returned by the Online Design Tool.
With a large inlet to reduce the risk of blockage, the conical unit is ideal for control of foul or combined sewer flows. It can also be used for surface water systems with high flow rates where space is restricted or where a sump is not possible.
The adjustable inlet can be added to Conical Hydro-Brake® Optimum units as an optional extra by selecting the ‘Future proof’ option in the Online Design Tool.
Minimise blockage risk (CL)
This objective makes the inlet and outlet openings as large as possible whilst still delivering the same design flow, minimising the risk of blockage.
This option can be applied to units for both surface water (S-Type) and foul/combined (C-Type) flows.
Adding an adjustable inlet to adjust the flow by reducing the inlet size is therefore counterintuitive meaning the adjustable inlet is not available for the CL objective.
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Linear discharge profile (CU)
This objective generates a discharge characteristic as close to linear as possible, providing similar hydraulic performance to an orifice plate, but with internal clearances approximately two to four times larger
Units designed with this objective will be as small as possible, making the size too small to fit an adjustable inlet
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Fit to outlet pipe (XP)
This new objective enables engineers to fit a Hydro-Brake® Optimum to a specified pipe diameter, whilst maximising the hydraulic efficiency that can be achieved for that pipe size.
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, whilst meeting the same design flow. This makes it ideal for retrofit into existing chambers.
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Design complex systems
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.
Low Flows
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.
> To find out more download our white paper, Going with the Flow.
UK 3D BIM Models
> Request a UK 3D model of the Hydro-Brake® Optimum for use with UK Building Information Modelling (BIM)
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England's Best Kept SuDS Secret
A pioneering drainage project on a Hampshire housing development, acclaimed as a national example of good practice, was only made possible…
Hydro-Brake Optimum Delivers Tight Fit for New Homes Storage in West Yorkshire, UK
A Hydro-Brake® Optimum vortex flow control enabled the designers to meet the 110 l/s maximum limit whilst not exceeding the available…
Raising a Toast to SuDS on a Steep Scottish Mountain Highway
Potential road safety problems on the A95 have been tackled with an imaginative SuDS Solution from Hydro International. Situation …
Q
How much downstream clearance should I allow?
A
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.
Q
Does the unit work under downstream surcharge conditions?
A
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.
Q
Why is there a door on the front of the unit?
A
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.
Q
What type of maintenance does the unit require?
A
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.
Q
How many flow control units will I need?
A
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 - please contact us if you would like support.
Design your Hydro-Brake® Optimum flow control online
Use our Online Design Tool to precisely engineer a Hydro-Brake® Optimum flow control to meet your specific site requirements.
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