WA Water-Gate

Water-Gate WA Barrier

The perfect tool to save time and preserve the environment whilst keeping costs low!

The WA barrier is specially designed to be installed in watercourses. It can be used to create water reserves in rivers and brooks.


WA Water-Gate


  • Controlling pollution spills in watercourses
  • Creating a reserve to enable high volume pumping
  • Use as a cofferdam in small rivers or streams


  • Can be converted to a flood barrier by adding a ballast
  • Quick
  • Economical
  • Works on various surfaces
  • Environmentally-friendly
  • Reusable

Water-Gate flexible cofferdams are used by contractors and site managers for their efficiency, simplicity and versatility.

Use to create areas to repair structures, underpinning, reinforce river supports, repointing, restoring ecological continuity, removing log jams, renovating bank, draining feeder canals, etc.

Works in water – rivers – canals – ponds. WA Water-Gates can be used in a variety of situations. Uneven ground increases friction and thus the stability of the dam. Care is required when using the dam on muddy ground. On a concrete surface, we recommend using the WL range of flexible cofferdams, rather than the WA range of cofferdams. On a sandy surface, you must bury the leading edge to limits the effects of piping erosion.

Models Available

WA Water-Gate Size Diagram
Water-Gate Flood Barriers
WA Water-Gate Diagram


* Cofferdam designed without ballast: the flexible leading edge fits perfectly over uneven surfaces
** Only for installation in standing water
*** Deep ground sheet that facilitates pedestrian passage and safe pumping for chutes
**** Limits the risk of erosion in the event of overflow, especially on sandy beds

Model Height/cm Length/m Width/cm Weight/kg
WA 2815 71 4.6 246 15.2
WA 2825 71 7.6 246 24.1
WA 2835 71 10.7 246 34.1
WA 2850 71 15.2 246 46.7
WA 3930 100 9.1 404 65.1
WA 3950 100 15.2 404 108.7
WA 5030 130 9.1 526 92
WA 5050 130 15.2 526 153
WA 6030 150 9.1 610 106
WA 6050 150 15.2 610 174.3


The system can be used in conjunction with an Overflow Diverter Tunnel to replace over-pumping for in-water works

In Water-Works

Overflow Diverter Tunnel

Traditionally, sandbags have been used in streams to create a dry working area. When the water flow is blocked by the dam, the water level rises, and a pump is required to ‘over-pump’ the water downstream, past the dam. With the Water-Gate, an overflow diverter tunnel can be used which replaces the need for over-pumping. The overflow pipe clips onto the top of the barrier allowing the water to be channelled downstream.

The overflow pipe has a max flow capacity of 90 litres per second (5400 litres per minute).

The kit consists of 2 main parts: the overflow diverter and the main tunnel.

Overflow Diverter Diagram

Overflow Diverter

The Overflow Diverter is made of incredibly tough and hardwearing polyethylene. The black portion is funnel shaped to siphon off and drain excess water behind the Water-Gate. The yellow sliding float inside the diverter is intended to stabilise it, and allow the water flow to be adjusted. It is recommended to weigh the diverter down with a couple of ballast bags on top of the diverter to maximise the flow and improve stability.

Dimensions: 38cm (h) x 61cm (w) x 1m (l) 14.5Kgs


The main tunnel connects to the overflow diverter and can be used to channel water downstream.

The main tunnel comes with rugged handles every 1.5m (5ft) for easier handling. The tunnel is 22.7m (75ft) long.

The complete kit includes both the Overflow Diverter and Main Tunnel: Code DA1200. Diverter tunnel benefits include:

  • Reusable
  • Environmentally friendly
  • Quick to install
  • Durable
  • Easy to use

In action

Related Products

Brand your barriers

WL Water-Gate Branding

Thanks to Megasecur International’s continual investment, we now have the ability to brand customers’ barriers with company logos.

Please contact us for a quote for this.

Contact Us
Contact Us

After 4 floods in 16 years, the Water-Gate Barrier was used in November and December 2012. The relief when it prevented what would have been a 5th and 6th flood was enormous. The best part is the piece of mind that follows.

Pam, Nottingham Resident

I would not hesitate to recommend Flood Protection Solutions, a very professional and detailed service.

Neil, Hebden Bridge Resident

The service that was provided was very good, communications were excellent, and they dealt with our issues in a very responsive and professional manner.

Trevor Palmer, Sellafield Ltd