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Activity Name:

Semi-permanent reparation with Rock Fill

Activity Numbre:

111

Activity type

Exercise

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

To test a reperation method that is used in the EA.

Activity Brief descriptor

Filling the erosion hole with 2 ton rock bags.

Linked to theme(s):

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

Activity Time

Start Date:

March 3, 2021, midnight

End Date:

Feb. 2, 2021, midnight

Active time length:

Days:

1

Hours:

None

Other:

Location

Levee stretch:

IV

Coordinates/ Latitude (WGS):

None

Coordinates/ Longitude (WGS):

None

Coordinates/ Altitude (mTAW):

None

Descriptor:

Other references:

Data

Data: 1

Data type: powerpoint
Description: factsheet with lessons learned
Date availability: Dec. 19, 2022
Find at: https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/EZdZXEYoBJpGshmzH2mtYUIBG2J8_Culz2-I_rA45S8ssw?e=q2SUg1
Media avaliable:
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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

The rock bags were placed with a long reach escavator from the toe of the levee. The escavator could reach 35 meters with the 2 ton rock bags. The bags were placed in the erosion hole in a stepway profile. Because the bags were not filled completely the bags formed in the hole. The sides are difficult to make a good connection and this are the week spots of this emergency reparation. Experts worried about the amount of load in the inner part of the levee during an emergency reparation.

Post-activity conditions

The rock bags are tested with an overtopping generator, see other experiment.

Immediate Results

It was difficult to place the rock bags in the erosion hole with an escavator. It is also difficult to get the bags on location. This is more a solution for the outerbank of the levee and for breach closure than for this specific situation.

Results /Conclusion

Interesting option but more suitable for the outerbanks and breach closure.

Infrastructure Knowledge

Other key information