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  2. Activity : N-OF05B Overflow Test (Damage repair)
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Activity Name:

N-OF05B Overflow Test (Damage repair)

Activity Numbre:

68

Activity type

Strength test

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

The test is part of a series of test aimed at emergency / temporary repairs.

Activity Brief descriptor

Overflow was executed on a clay fill repaired section.

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. 17, 2021, 8 a.m.

End Date:

Nov. 17, 2021, 5 p.m.

Active time length:

Days:

0

Hours:

1.0

Other:

Location

Levee stretch:

VI

Coordinates/ Latitude (WGS):

51.34852

Coordinates/ Longitude (WGS):

4.22893

Coordinates/ Altitude (mTAW):

12.0

Descriptor:

Landward side of levee

Other references:

Lambert'72 coordinates: X=140257.8, Y=226535.6

Data

Data: 1

Data type: Timeseries
Description: Timeseries of Discharge, Water Height and Current Velocity in different positions on the levee slope.
Date availability: None
Find at: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/El-6yWWUrqpOh1crc_tPdT8B75jJErz8_6aEoyl_JD6OAA?e=9QkVu2
Media avaliable:
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Data: 2

Data type: Photo imagery
Description: 2 portals with in total 4 cameras are used to take surface photographs of the levee slope at different times during and in between overflow activity. The surface images in between overflow blocks show damage and vegetation evolution.
Date availability: None
Find at: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EmDAq9bIfJpKgvRfUm-OKpMB8a2m62bAahFBgXOYUohkpA?e=DbX37L
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Relationships with other activities

Detaled information about the activity

Pre-conditions

Clay filled emergency repair, sparse vegetation.

Activity Descriptor

Overflow at a discharge of 375 l.s (=187 l.(s.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

Very fast erosion of the clay cover was observed. The overflow was discontinued early.

Post-activity conditions

Large scale damage to the levee cover.

Immediate Results

Clay fill as emergency repair does not withstand overflow.

Results /Conclusion

Factual data report: https://stowanl-my.sharepoint.com/:w:/g/personal/llhpp_stowa_nl/EX5yYnuJ-EBBjoKAxAwg8LkBef8ra9V_-GHjzbkz0Was8g?e=pyaUSq Annexes: https://stowanl-my.sharepoint.com/:w:/g/personal/llhpp_stowa_nl/EWIzoxIhxopCryc6744YgHYBBWr_0fhoGpJ_1pSy0_tM2w?e=pY8Hc6

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