Hydro International

Manage surface water, watercourse and foul/combined sewer flows with the Hydro-Brake® Flow Control Series.

The Hydro-Brake® Flow Control Series is a comprehensive and versatile toolbox of precision-engineered devices for flow control and attenuation.

Designed with hassle-free installation in mind, each device is scalable and adaptable and comes with a wide range of accessories to ensure ease of installation and commissioning.

Hydro-Brake® Flow Controls can also be supplied pre-fitted in precast, reinforced concrete chambers for faster and safer installation on site.


Hydro-Brake® Optimum Vortex Flow Control

Customise your flow control for surface, foul or combined flows and save storage / land-take costs.

The Hydro-Brake® Optimum is Hydro’s flagship passive flow control device and the most advanced vortex flow control available.

Hydro-Brake® Optimum is the only vortex flow control that can be fined tuned for optimum flood storage and surface water performance, saving on land-take and construction costs.


  • Custom designed, precision-engineered flow control
  • Save operation and maintenance costs
  • Build in allowance for climate change
  • BBA and WRc certified product
  • Flexible and easy installation


  • Surface water management and Sustainable Drainage Systems (SuDS),
  • Combined drainage systems and CSOs,
  • Watercourse flood prevention,
  • Sewer network optimisation
  • Wastewater treatment plants.


The Hydro-Brake® Optimum has been assessed to the very highest level by the BBA and WRc for its hydraulic performance and ability to match even the most complicated requirements.  Demonstrating our commitment to both quality and sustainability, Hydro International is also accredited to both ISO 9001 and ISO 14001 standards.

Mounting Options

Where units are to be fitted on-site, we provide a variety of mounting options:

  • Lugs
  • Push-fit spigots
  • Flat or curved mounting plates
  • Penstock or slide mounts
  • Removable units

All Hydro-Brake® Optimum units can also be supplied with an adjustable inlet to future-proof the device, allowing flows to be altered post-installation, to account for site expansion or climate change.

Hydro Brake Optimum Vortex Flow Control

Hydro-Brake® Optimum Chamber Option

Save time on site and reduce confined space entry.  No coring or drilling, no headwall construction and reduced benching.

Get a Hydro-Brake® Optimum ready installed into a purpose-built pre-cast, reinforced concrete chamber.

The Hydro-Brake® Optimum chamber is available in a range of sizes. The 1200 mm, 1500 mm and 1800 mm are the Marshalls CPM Perfect Manhole system which will fit exactly in place without the need for grouting for fast, safe and cost-effective installation.

The Marshalls CPM Perfect Manhole complies with BSEN 1917:2002 and BS5911-3 and is accepted for use by all major UK companies.

Standard BS EN 1917:2002 chambers are used for 2100 mm and above.

The chamber is ready cored with holes to suit your site specification and comes with preformed options including benching, weir wall or headwall requirements.

The Hydro-Brake® Chamber option is also available for our Hydro-Brake® Orifice and Hydro-Brake® Agile flow controls.

Hydro Brake Optimum Chamber Option 1

Hydro-Brake® Agile

Meet site runoff objectives for very space constrained sites with responsive, float-controlled operation.

The Hydro-Brake® Agile delivers precision-engineered flow control over a wide range of heads, even for the most constrained sites.

Hydro-Brake® Agile is a float-operated flow control, the only design that achieves a constant rate of discharge and therefore the minimum possible upstream storage. It is ideally suited to applications with constrained discharge requirements or where the flood storage area available through attenuation is very limited.


  • Save construction and land-take costs.
  • Meet strict discharge consents.
  • Repeatable, predictable maintenance regime.
  • Build in allowance for climate change.


  • Surface water management and Sustainable Drainage Systems (SuDS),
  • Combined drainage systems and CSOs,
  • Watercourse flood prevention,
  • Sewer network optimisation
  • Wastewater treatment plants.

Hydro Brake Agile

Hydro-Brake® Orifice

Manage moderate flows at sites with generous discharge consents.

The Hydro-Brake® Orifice delivers cost-effective, precise flow control for a wide variety of applications.

A low-cost, low-complexity flow control, it is suitable for unconstrained sites with generous discharge consents.


  • Manufactured to suit your precise hydraulic requirements.
  • Varied configurations and mounting options available.
  • High-grade Stainless Steel.
  • Can be mounted on moveable or removable structures for maintenance purposes.


  • Surface water management and Sustainable Drainage Systems (SuDS).
  • Watercourse flood prevention.
  • Sewer network optimisation.

Hydro Brake Orifice 1

Pdm Brandch Locator