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  2. Activity : Emergency reparation - Incission of clay cover
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Activity Name:

Emergency reparation - Incission of clay cover

Activity Numbre:

123

Activity type

Other

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

Activity Brief descriptor

Incision in clay cover and EPDM underneath it such that the erosion pitt is repaired.

Linked to theme(s):

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

Activity Time

Start Date:

Dec. 14, 2020, 11:52 a.m.

End Date:

Dec. 14, 2020, 11:52 a.m.

Active time length:

Days:

None

Hours:

None

Other:

Location

Levee stretch:

IV

Coordinates/ Latitude (WGS):

None

Coordinates/ Longitude (WGS):

None

Coordinates/ Altitude (mTAW):

None

Descriptor:

Patrick Cliff

Other references:

Data

Data: 1

Data type: pdf
Description: Repair measure Patrik’s Cliff –combination of geotextile and sand bags
Date availability: Nov. 24, 2022
Find at: https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/EeNTxJbSHadCsbMftca0aGIB1EOAntYztANYZyhthkBXhw?e=EW9mZu
Media avaliable:
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Data: 2

Data type: powerpoint
Description: design figures
Date availability: Nov. 24, 2022
Find at: https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/ES0tt2YIBblHi-33d3JWMXQBN40ibZaP3EevzaGxrL1Etw?e=If8YBU
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Data: 3

Data type: jpg
Description: photo's of executing measure
Date availability: Nov. 24, 2022
Find at: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/El8vbyxvRNlIql3mnsK5s74BoqSiRPvFv3mqiIJULLfgQQ?e=cpNEnx
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Relationships with other activities

Detaled information about the activity

Pre-conditions

Activity Descriptor

Equipments

this activity does not have equipments

Monitoring & Sensors

this activity does not have sensors

Limits

During Activity

During the activity the following observations were seen: - The EPDM material is heavy enough such that it can be carried in a group of 6-8 people. - It is easier when the EPDM material is on top of the levee such that it can be rolled down - The incision with a small escavator went really well. - It is difficult to make a straight incision, so you always go a bit up the levee - Anchoring the incision with u-profile anchors is adviced such that it makes a strong connection - Make sure there is enough material on the sides such that no water is flowing in the erosion pitt during overflow conditions - Working safe is difficult on a steep levee with EPDM material so attention must be paid

Post-activity conditions

The EPDM method hold well. The situation is put to the test and hold well. See other experiment.

Immediate Results

EPDM works well as cover material. In combination with anchors it can tear and you must fold it such that it is stronger. The weight of EPDM is not too much that it cannot be carried but heavy enough against strong winds.

Results /Conclusion

The result is possitive. This is a realistic and promising innovative way to protect the levee when an erosion hole is formed.

Infrastructure Knowledge

- EPDM is new to use as a cover material but works well when you don't want water to go trough. In other cases geotextile can be used. - 4-6 people necessary to place 6x10meter EPDM - Heavy material such as EPDM can be handy with strong wind.

Other key information