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Haawal Flood Grating

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Before using temporary flood protection barriers it is crucial that proper considerations for its use are made by someone qualified to do so. 


Using any type of flood protection can have unintended consequences in areas further down the flood path. It is therefore crucial that these effects are taken into consideration.


The ground conditions must be known before using temporary flood barriers as the permeability of the ground will affect how much water is able to pass underneath the system. In use cases with leakage through the ground it may be necessary to complement the portable flood barriers with pumps.


Use gloves and other personal protection equipment when installing Flood Grating. 


The barrier should be supervised at all times in situations where vandalism is a risk. Supervision is also recommended to ensure that members of the public do not stand close to the barriers during a flood. It can be dangerous to stand behind the flood barrier during a flood and this must therefore be avoided. 


Floods are inherently unpredictable and dangerous. Even with qualified decisions around the use of the portable flood barriers there will always exist a risk of damage to property and personal injury that the supplier cannot accept liability for.

Challesnges of using mobile flood protection


Installation overview

Flood Grating comes in two heights (90cm and 120cm). 

The installation steps are the same for the two heights as illustrated below.

How to install Haawal flood grating 120cm

Insert the walls

Place the

ground panels

Roll out the membrane

Attach the support wires

Weight the membrane



Haawal 90cm installation

Insert the walls

Place the

ground panels

Roll out the membrane

Attach the support wires

Weight the membrane

Step 1: 
Place the ground panels

Flood Grating Base Panel

The flood grating panels are different on each side. One side is smooth and has a black square at the attachment point, the other is coarse and has a metal bracket at the attachment point:


Black Square, must face upwards


Metal bracket, must face towards the ground

Place the Flood Grating panels on the ground with the flat side facing up, and with the pins facing away from the side that will be flooded. 

The panels should be placed as closely as possible. However, there must be a gap of at least 5 mm to allow space for the wall to be inserted as described in “Step 2”.

Step 2: 
Insert wall panels

Flood Grating Wall Panel

The walls are attached to the bases by inserting the connecting pins of the wall panel into the row of square holes nearest the connecting pins of the base panel. (please note that the base panels and wall panels are interchangeable)


The flat side of the wall panel must face the flooding side while the rough side must face the dry side. 

Haawal wall interst

Step 3: 
Roll out the membrane

Haawal plastic membrane installation

Roll the membrane out over the base panels, as close to the wall panels as possible. Open up the membrane and fold the membrane over the wall. It is important that the membrane is able to rest against both the base and the wall.

In the event of strong winds while performing this step it is recommended to do it one module at a time. Roll the membrane past one module, and then fold it over the wall and attach the support wire as explained in step 4. Repeat this process until the whole membrane is rolled out. It is recommended to be at least 3 people when performing this step in windy conditions.

If more than 25 meters of Flood Grating is installed several membranes can be used. They must overlap with at least 1.5 meters and be attached with the included tape. The overlap must lay in the expected direction of flood current.

Step 4: 
Attach the support wire

Haawal steel rope attachement - flood barrier

The support wire is attached by first pressing the bolt of the handle through the membrane, into the black attachment point. The handle is then rotated to tighten the bolt which also seals the hole created when penetrating the membrane.

bracket screw

The keys are then attached to the back of the wall (maximum 15 cm from the edge). The keys must be attached so that the wire is in slight tension.

key attach

Step 5: 
Weight the membrane

Temporary flood protection sand bag

Place a row of sandbags on the front of the membrane that ensure the membrane creates a seal against the ground. The sandbags should be placed with no gaps between them. The sandbags must not be overfilled to ensure they are flexible enough to adapt to uneven sections of the ground.

If you have any questions about how to set up Flood Grating please contact us

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