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  2. Activity : B-OF03 Overflow Test (High Discharge)
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Activity Name:

B-OF03 Overflow Test (High Discharge)

Activity Numbre:

78

Activity type

Strength test

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

Perform an overflow test on a narrower section in order to achieve a higher specific discharge.

Activity Brief descriptor

By generating overflow over a levee crest, using a custom built overflow generator, the strength of the levee cover against erosion and/or failure is evaluated. The B-OF03 test is conducted over a section of 1 m wide (instead of 2 m by default) in order to evaluate the impact of a higher discharge compared to the reference test.

Linked to theme(s):

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

Activity Time

Start Date:

Nov. 10, 2020, midnight

End Date:

Nov. 11, 2020, midnight

Active time length:

Days:

None

Hours:

10.0

Other:

Location

Levee stretch:

IV

Coordinates/ Latitude (WGS):

51.341395

Coordinates/ Longitude (WGS):

4.23859

Coordinates/ Altitude (mTAW):

11.2

Descriptor:

Landward side of the levee.

Other references:

Lambert'72 coordinates: X=140930.2m; Y=225741.8m.

Data

Data: 1

Data type: Factual data report
Description: Factual data report describing the tests on the Belgian part of the HPP levee.
Date availability: None
Find at: https://stowanl-my.sharepoint.com/:w:/g/personal/llhpp_stowa_nl/EVpQIrpc_n1MhDLPmEL2Qh0BgEH8RdDV7ncL0iksYdxubw?e=fvXzeo Media avaliable:
Media avaliable:
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Data: 2

Data type: Monitoring data
Description: - Hydraulic timeseries - Photographs - ... (variable per test)
Date availability: None
Find at: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Eu8DAI4dmtNDqpFM3xnLeV0BqGO76lVkD2wkdGrozAo05A?e=Tlq4tr
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Relationships with other activities

  • Activities that are linked to 78/ B-OF03 Overflow Test (High Discharge) :

    No activities

  • DB_id: 78/ B-OF03 Overflow Test (High Discharge)

  • DB_id: 78/ B-OF03 Overflow Test (High Discharge) linked to the following activities:

    DB_id: 88/ P2C Overflow tests

Detaled information about the activity

Pre-conditions

Levee slope in visually good conditions.

Activity Descriptor

Overflow during 10:00 hours with a typical discharge of 340 L/s.m over a width of 1 m.

Equipments

Equipment: 1

Overflow generator.
The setup is described in Vercruysse et al. (2022): "Design and application of an overflow generator." (Ref WL2022R20_047_1)

Monitoring & Sensors

- Overhead cameras (4) - Acoustic water height sensors - Electromagnetic current velocity sensors - Discharge sensor (EM or acoustic)
Description of the hydraulic conditions of the overflow. The setup is described in Vercruysse et al. (2022): "Design and application of an overflow generator." (Ref WL2022R20_047_1)

this activity does not have sensors

Limits

During Activity

During the test, it was observed that soil eroded slowly and exposed grass roots, without creation of any significant damage that would lead to imminent failure of the levee slope.

Post-activity conditions

Slope surface shows signs of erosion and barren patches where vegetation is removed, but the clay cover layer is intact. No failure has occurred.

Immediate Results

The higher discharge experiment did not lead to strong(er) erosion or damage evolution than observed in the reference case (B-OF01).

Results /Conclusion

Factual data report + Annexes: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EvdAZOO-zylAqEWS8-SEiC4BQ5xCAuFXklsysJXnkcVYaQ?e=XDeXq8

Infrastructure Knowledge

An integration report will be added later (February 2023) as knowledge document.
The integration report discusses insights gained from both the steady overflow and wave overtopping tests.
under development

Other key information