Mobile Obstacles Omniflots®

The mobile obstacles Omniflots®, similar to riprap in a natural river bed, make it possible to vary the water movements in a whitewater course depending on the expected audience (tourists, schools and competitors).

It is today the most flexible product in use to quickly change the navigation difficulties of a whitewater river.

More than 30 whitewater facilities around the world are equipped with the Omniflots® mobile obstacle system, including 3 Olympic venues.

These obstacles are suitable for both medium-level whitewater rivers and Olympic-level courses, such as the Olympic Games in Sydney, Athens or Beijing.

stades d'eau vive réalisés par Hydrostadium - obstacles mobiles 27 years of experience

Following preliminary tests under extreme conditions (tailrace channel of a hydroelectric plant at high altitude) in 1991, the first official start-up was carried out in 1992 for the tidal whitewater course of Lannion (France).

Since 1992 it has not been necessary to change a single obstacle Omniflots in this whitewater course running with the seawater mixed with fresh water and subject to the floods of the river!

The Omniflots® obstacle system is protected by several international patents. Since the creation of the first Omniflots® obstacles, several generations of mobile obstacles have succeeded each other successfully.

obstacles mobiles omniflots

The water movements are created by an assembly of polyethylene elements of different heights arranged in the river bed. These movable obstacles are simply plugged into inserts and can be locked.

A base serving as a support for obstacles with 3 inserts slides at will on the rails arranged in the invert of the river bed.

obstacles mobiles omniflots
1. Mounting Base

Hydrostadium has created a new obstacle that allows both using the rail system positioned all over the riverbed and keeping the use and flexibility of the Omniflots® mobile obstacle system.

The aluminum reinforced structure is attached to the rails at the desired location. This structure is then covered with a polyethylene envelope secured by circlips thus transforming it into a bottom obstacle.

fond rail obstacles mobiles
rail pour obstacles mobiles omniflots

The caps used to close the insert are held in place by the thread, also present on the upper part of the inside of the insert. The upper part of the cap is a hollow shape, crossed by a small bar.

Insert pour Obstacles Mobiles Omniflots
2. Mobile Obstacles Omniflots® III
Several sizes for different variations

Available in four different heights, to multiply the variations of the water movements and a catalog varied colors.

Management of flows

Space between obstacles controllable to accomplish the current flows.

Designed to protect users
Hexagonal shape

Hexagonal shape to remove
spaces between obstacles.


Rounded corners for the safety of users.

Flexible Envelope

Molded in high-density polyethylene (HDPE), the envelope remains a flexible material designed to absorb shocks...

Designed to be mobile, portable - lightweight

Non weighted obstacles.
Integrated handles.

Simple (only one movement) and in humid environment long lasting fixing system.

Simple modification of the positioning of the Omniflots® III obstacles.

HDPE envelope

Flexible material with a high mechanical and chemical resistance.

3 generations of obstacles since 1992

First construction of a whitewater course


Launch of the Obstacle Mobile concept


Omniflots I & Insert I system


Whitewater Stadium Sydney Olympics


Whitewater Stadium Athens Olympics / Omniflots II


Inserts II


Whitewater Stadium Beijing Olympics / Omniflots III


Omniflots III with fixing system


More than twenty Whitewater stadiums around the world are equipped with the mobile obstacles Omniflots® system.

These obstacles adapt to both Whitewater rivers of medium difficulty as Olympic level courses at the example of the Olympic Games.

Hydrostadium : design & construction follow-up

Hydrostadium realizes the design of your Whitewater course in coordination with your teams.


Thanks to its expertise and know-how of its engineers, Hydrostadium designs a course without physical model.

You greatly limit the design cost with our solution.


Hydrostadium can achieve the construction follow-up to ensure compliance with the design specifications for the success of your project.

Insert I & II system

The system for inserts allows secure fixing of the obstacles and the creation of bottom water movements.

Stimulates the bottom water movements to regain the feelings of natural rivers

Improves the safety of navigation by its rounded forms and reduces the pulsating movements

Optimizes the number of obstacles needed to obtain the desired variations

A made-to-measure concrete field (caillebotis) for the inserts

A made-to-measure concrete field (caillebotis) integrates the inserts.

The constructor of the river manufactures the caillebotis to incorporate the inserts. Once made, the caillebotis are then locked to the riverbed to avoid the phenomena of landslide under the force of the water. Inserts I are used when water is charged with material in suspension (sand). The caillebotis are self-cleaning.

Water movements & security

Concrete forms are performed on the upstream sides. These forms allow creating various water movements and softening the possible contacts of the swimmers against the caillebotis.

FLEXIBILITY – SETTING & configuration

The fixing system into the insert II allow to:

  • Provide flexibility in the configuration of the artificial riverbeds,
  • Improve aesthetics,
  • Vary the bottom water movements.

Fixing principle

"Costs specific to the river are reduces"

The inserts are installed in "fields" in the river bed; this principle can create bottom water movements just like they exist in natural rivers. This hydraulic setting reduces very significantly the number of mobile obstacles necessary for creating surface water movement. Costs specific to the river are thus reduced.


"Avoids the construction of an expensive physical model."

The constructive principle is to cover 20% of the riverbed by fields with inserts II. The location of 80% of inserts II fields are defined on a plan. The remaining 20% are positioned on site after the first tests in water which allows a fine adjustment of water movements.

This principle and the experience of Hydrostadium thus avoid the construction of an expensive physical model.

© 2018 Hydrostadium