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  2. Activity : Test of mobile barriers Cuirassier in Hedwidge Prosperpolder – February 2022
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Activity Name:

Test of mobile barriers Cuirassier in Hedwidge Prosperpolder – February 2022

Activity Numbre:

139

Activity type

Exercise

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

Test installation time, stability and leakage of mobile barriers Cuirassier on natural ground.

Activity Brief descriptor

This LpS8 Cuirassier module is a temporary flood protection barrier in urban and industrial environments. It is installed, anchored or not, on impermeable ground such as asphalt, paved surfaces or concrete. It allows emergency action during rapid or slow flooding in impermeable areas, without requiring heavy human and mechanical resources. These modules have been tested during two days on 3rd and 4th of February 2022 in Hedwidge Prosperpolder in coordination with the Dutch Ministry of Defence.

Linked to theme(s):

Breaching
Animal- & vegetation-induced anomalies
Erosion processes
Temporary levee repairs
Levee survey & monitoring technique
Prolonged collaboration

Activity Time

Start Date:

Feb. 3, 2022, 9 a.m.

End Date:

Feb. 4, 2022, 5 p.m.

Active time length:

Days:

2

Hours:

14.0

Other:

Location

Levee stretch:

VIII

Coordinates/ Latitude (WGS):

None

Coordinates/ Longitude (WGS):

None

Coordinates/ Altitude (mTAW):

None

Descriptor:

The site in Hedwidge Prosperpolder was prepared in coordination with the Dutch Ministry of Defence. A large pool was surrounded by dikes. The water level in the pool was controlled on one hand by several pumps (a main pump and three secondary pumps) and on the other hand by an emergency valve. The pumps enabled the rise of the water level with a speed around one meter per hour.

Other references:

Data

Data: 1

Data type: Picture
Description: Installation of mobile barriers
Date availability: Feb. 3, 2022
Find at: https://drive.google.com/file/d/1c8Tw0xryh677hOQccllBXiFfhcmjk8GU/view?usp=share_link
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Data: 2

Data type: Picture
Description: Installation of mobile barriers
Date availability: Feb. 3, 2022
Find at: https://drive.google.com/file/d/114k0s4HijKFXKGtNggCCSCbfcKEjxgF-/view?usp=share_link
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Data: 3

Data type: Picture
Description: Installation of mobile barriers
Date availability: Feb. 3, 2022
Find at: https://drive.google.com/file/d/13WejUFLOaJ1R9pbqA0XGG96or8f_OwNb/view?usp=share_link
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Data: 4

Data type: Picture
Description: Test of Cuirassier in La Boucau (South of France) InterREG Sudoe Inundatio
Date availability: April 18, 2022
Find at: https://drive.google.com/file/d/1j0v887beAML9vD8yJUvv92H23AMkq21l/view?usp=share_link
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Data: 5

Data type: Video
Description: LPS8 Cuirassier mobile barrier
Date availability: Jan. 19, 2023
Find at: https://drive.google.com/file/d/1c14IQu5QjZ6JxCKV7VRAzzdNxZ9m_oeA/view?usp=share_link
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Relationships with other activities

  • Activities that are linked to 139/ Test of mobile barriers Cuirassier in Hedwidge Prosperpolder – February 2022 :

    No activities

  • DB_id: 139/ Test of mobile barriers Cuirassier in Hedwidge Prosperpolder – February 2022

  • DB_id: 139/ Test of mobile barriers Cuirassier in Hedwidge Prosperpolder – February 2022 linked to the following activities:

    DB_id: 134/ Emergency Response Exercise

Detaled information about the activity

Pre-conditions

Test on natural ground without anchorage.

Activity Descriptor

This LpS8 Cuirassier module is a temporary flood protection barrier in urban and industrial environments. It is installed, anchored or not, on impermeable ground such as asphalt, paved surfaces or concrete. It allows emergency action during rapid or slow flooding in impermeable areas, without requiring heavy human and mechanical resources. These modules have been tested during two days on 3rd and 4th of February 2022 in Hedwidge Prosperpolder in coordination with the Dutch Ministry of Defence. Several tests were organised in order to limit water leakage.

Equipments

Equipment: 1

LpS8 Cuirassier module https://drive.google.com/file/d/1c14IQu5QjZ6JxCKV7VRAzzdNxZ9m_oeA/view?usp=share_link
Easy and fast to install

Monitoring & Sensors

Use of pumps to assess water leakage.

this activity does not have sensors

Limits

During Activity

2 days

Post-activity conditions

Immediate Results

Good installation time but the leakage was too large.

Results /Conclusion

The barriers were tested previously in Wallingford in a laboratory on a concrete ground. The leakage was assessed around 17l/h/ml. In Hedwidge Prosperpolder, the ground conditions were extremely difficult with the presence of five centimetres high bumps. The connexions between modules could not absorb alone these irregularities. The presence of a liner under the barriers was missing. This liner could assure the seal between the ground and the barrier system. Most of the leakage was observed under the connexions but leakage was also possible under the barriers themselves. The first day the water level became quickly the same in the two sides of the barriers. The second day, after the installation of a small geotextile and sandbags, the leakage was firstly reduced but appeared again after the rise of the water level. A pump was used to remove water behind the barriers. Its discharge was assessed around 50l/h/ml. The observed leakage was much larger than the pump discharge since the water level behind barriers rose very fast.

Infrastructure Knowledge

Good installation time but the leakage was too large.
Observations.
https://drive.google.com/file/d/1ZHwrJOTiyKODH7iXQGiKwcyTbnOLb4u0/view?usp=share_link

Other key information