More than 20 years of experience in flood protection











Self Closing Flood Barrier 

The Self Closing Flood Barrier SCFB, an unique effective flood defense system to protect people and property from inland waterway floods caused by heavy rainfall, gales or rapid melting snow. This system has been developed in the Netherlands to provide optimal protection against extreme high water levels. The barrier systems have proved to be the best flood protection and has already been built and installed in several countries around the globe. In operational use globally since 1998, the SCFB is acclaimed as the world's most effective flood protection system. Its success can be attributed to the simple, but ingenious concept of using the approaching floodwaters to automatically raise the barrier; effectively using the problem to create the solution. With an unblemished 100% track record the SCFB is a highly favourable preference when specifying optimal and cost effective but passive flood defence.




Low water

Following installation and in non-flood conditions, all operational parts of the barrier are invisibly concealed in the ground inside its basin.

Rising water

When floodwater rises the flood wall floats up. When the basin is totally filled, the angled support blocks will 'Iock' the barrier into position making it watertight.

High water

The water pushes the wall against the dry side of the basin and the guide rails and makes so a  watertight connection.

Working principle SCFB

In non-flood conditions, all operational parts of the barrier are invisibly concealed in the ground inside its basin. When the floodwater entered the basin the floating wall barrier will start to float up inside the basin. This gives the rubber seals space to move free when the barrier goes up; this prevents wear of the seals. When the floating wall is in the top position the angled support block will push the wall to the dry side and ‘lock’ the wall in position. The seals will make now a 100% watertight connection inside the basin and the guide rails.

The seals have a life expectancy of over 30 years. They are protected underground and therefore are not subject to UV degradation. In its closed position the barrier is protected below ground level and therefore not prone to vandalism. The barrier is not energy driven and therefore still operates in case of a power cut.

When there is a flood the barrier will always rise completely, normally within a few minutes.

As the water level subsides back to its normal level, the floodwater in the basin is drained out by either gravity or a pump located in the service pit, through a drain-pipe which is fitted with an one way check valve. As the water continues to drain from the basin, the floodwall returns to its resting position within the basin. In its closed resting position, the lid of the barrier seals to prevent the inflow of waste or debris 




Heights

The standard protection heights for the SCFB are: 500 mm,  1000 mm, 1250 mm, 1500 mm,  2000 mm and 2500 mm

all other heights are possible on special request. 

Malaga spain / SCFB 500 / total 6 meter

Protection Height 500mm 

Washington D.C. USA / SCFB 2500 / 2 x 8 meter

Protection height 2500mm




Lenght

The SCFB can be built at any required length. The basin from the SCFB can be built in concrete, galvanized steel or stainless steel. Depending on the requested length and location Hyflo or her dealer can advice what the best option is for the specific location. The floating wall consists of a PUR foam core with a fiberglass or GRP outer layer. The walls are reinforced with composite profiles and textile fiberglass. The wall is fabricated in 1 m lengths (deduction of a notional tolerance) and connected together to form the overall length of the required barrier. The connections of the walls to each other are done by a reinforced rubber strip and stainless steel mounting strips. Because of the unique patented design of the SCFB and the strength of the floating wall the barrier can be build in every required length.

The Town Cockermouth UK

Lenght 120 meters

     

van Abbemuseum Eindhoven NL

Lenght 34 meters        




Guide rail or guide slot,

It is possible to choose between guide rails or guide slots as end protection of the SCFB. Guide rails are mounted at the outside of the fixed wall and guide slot can be mounted inside the fixed wall. 

The operation of the SCFB relies on a guide rails or guide slots at each end of the barrier to seal against, (under flood conditions) the sidewalls. Where the barrier is fit between two fixed wall reveals a guide rail or a guide slot is mounted to the wall and reveal and sealed with a mastic sealant. The angle also allows the barrier to be guided when rising and falling.

Guide Rail

Guide Slot




Guided posts,

When two lengths of SCFB units have to be connected to each other, or when the barrier has to make an angle, they must be connected with a guide rail. Connecting guide rails can be ordered in all different angles. 

Where long lengths of barriers are installed, which cannot be accommodated in one length, guideposts are introduced to break the length up. 




Key benefits

   No warning system and warning time required

The SCFB is not energy driven and operates without any human intervention and gives 7/24 hours a full 100% protection. Even when there is a power outage the SCFB will raises instantly though the rising water level.


  No manpower required

This makes the SCFB not only reliable but also the most economical flood barrier in the long-term. Training people and testing barriers request a lot of manpower and for every job there must be at least two reserve men which must also be trained. The SCFB request no manpower and for testing the barrier very few people are required.


  No storage needed

In resting position the SCFB is invisible and fully self-protected at the location in the ground. No storage elsewhere and transport is needed in case of testing or a flood situation.


  Short closing time

Because of the short closing time the barrier will only comes up when there is a flood situation. No unnecessary falls deployment is needed. So the area remains accessible until the last moment.


  Low operational cost

All applied elements represent the highest quality, with a unlimited time length. The recommended frequency for maintenance and testing of a flood barrier is once or twice a year. The SCFB can be connected to the main water supply ore filled by a pump. By filling up the pit the barrier is lifted automatically and ready for inspection so this is a one-man job.


Performance Assessment flood barriers

In this analysis Mobile Flood Barriers, Permanent Attended Flood Barriers and the SCFB have each been scored on risk failure against the assessment criteria of the Dutch Water Board

Closing Operation Assessment Criteria:

Meeting all requirements:

0

Meeting general requirements:

1

Likely remaining within the set of general requirements:

2

Remaining within acceptable risk limits:

3

In general not meeting requirements:

4


Gradual Flood Risk Criteria                                              

Mobile Flood
Barrier
Attended Flood
Barrier
Self closing Flood
Barrier

High water alarm failure

1

1

0

Failure to respond in time

1

1

0

Operational manpower shortage

2

1

0

Design weaknesses

2

2

1

Possibility of leakage

1

1

1

Traffic Problems

3

2

1

Closing time

3

2

0

Failure of operational parts

1

1

0

Sensitivity to vandalism

2

1

1

Sensitivity to Maintenance Problems

2

1

1

Manual operability

3

2

1

Storm operation

3

2

0

Energy Consumption

2

1

0

Recovery Rate

1

1

1

Operation Control

3

2

1

Deployment

1

1

1

Impediment

3

2

1

34

24

10


Cost analysis of flood barriers

In this analysis, Mobile Flood Barrier, Permanently Attended Flood Barrier as well as the SCFB have been compared in terms of their total annual cost.

Closing Operation Assessment Criteria:

No operational cost:

0

                                                                   

Relatively low operational cost:

1


Acceptable cost:

2


Relatively high cost:

3


Excessive cost:

4



Gradual Flood Risk Criteria

Mobile flood barrier

Attended flood barrier 

Self closing flood barrier

Depreciation

3

3

2

Maintanance

3

3

1

Storage

3

0

0

Transportation

3

1

0

Opeartional cast

3

3

0

Oparational staf training

4

3

1

Management cost

1

1

1


20

13

5