Everything about Levee Challenge 2022 - Team RWS - Use of erosion-resistant clay and rock bags
id;activity_name;activity_type;activity_descriptor;breaching;animal;erosion;temporary;levee_survey;prolonged;start_date;end_date;date_length_day;date_length_hour;date_other;levee_stretch;location_x;location_y;location_z;location_descriptor;location_other;objectif_important;objectif_knowledge;pre_condition;act_des;monitoring_process;monitoring_reasoning;limits;during_activity;post_activity;activity_result;results_conc;knowledge_desc;ref_links;wrk_1;wrk_2;wrk_3;key_info
89;Levee Challenge 2022 - Team RWS - Use of erosion-resistant clay and rock bags;Exercise;The Levee Challenge was a physical challenge in which groups of students and professionals were asked to repair the outer slope of a damaged grass covered levee.;True;False;True;True;False;False;2022-02-09 08:00:00;2022-02-11 17:00:00;3;;The damage had to be repaired within a time frame of 3 hours. Testing happened in the following days.;XI;51.350779;4.221762;;Test section on Dutch Levee. The slope is assumed to be 1:2.5.;;The Levee Challenge was a physical challenge in which groups of students and professionals were asked to repair the outer slope of a damaged grass covered levee. The groups need to take into account the efficiency, innovative and durable solutions for their protection measures. The reparation of the levee needed to be sufficient to withstand a series of wave overtopping generated with a wave overtopping simulator.;The use of erosion-resistant clay as a semi-permanent emergency measure.;Lower part of the levee was damaged by heavy traffic. Prior to the tests, 4 spots on the levee were damaged to make repairs. At the upper part of the levee slope, a cliff was dug with a width of ~1.5 m (parallel to levee slope) and a depth of 0.5-1m (deep enough to penetrate the upper clay layer).;After the repairs were done, wave overtopping tests were carried out during a 6 hour period. Within this 6 hour period different storm scenarios were tested, with significant wave heights of 1 or 2 m, and specific discharge ranging from 50 to 200 l/s/m.;;;;"See Report for more information and pictures.
The repair measure couldn’t withstand the water forces of the wave overtopping. The repair measure, however, lasted longer than many experts on site expected. The repair measure has not protected the cliff damage in the end which in large part can also be attributed to the way it has been applied.";The right hand side washed down quickly after which a significant erosion pit evolved, which eventually led to failure.;"1. Improve tamping down of erosion-resistant clay This is very important as this influences the performance of the solution (difference between left- and right side). This time a hand-driven tamping device was used. More effectively might be a bucket of a digger to tamp the clay.
2. Smooth & streamlined shape of clay It’s recommended to shape the erosion-resistant clay more aerodynamically, e.g. like a bathtub. This follows the natural flow of the water, minimizing impact and thus erosion. Important is to ensure a smooth interface at the side of the cliff damage, so no erosion will occur there.
3. Increase logistics efficiency This time mainly human hands were used to carry the clay and stone up the levee slope. Eventually leading to a human chain. In the future a digger or crane should be used to lift the material up the slope. However, in more remote areas, without the availability of access roads, this may stay an issue.
4. Increase effectiveness of geotextile In this test a geotextile was used, which was too small in hindsight. It barely covered the cliff. It needs to cover a larger area beside the cliff. Also more stamps are to be used at the sides of the cliff, to keep the geotextile in place.
5. Interlock rock bags The test showed that individual rock bags are forced down the slope due to the water force. The individual rock bags didn’t have enough stability on their own. Therefore, it’s recommended to interlock individual rock bags together by means of inserting vertical pins through more rock bags (more mass -> increased stability).
6. Use of better-quality rock bags During this test home-quality jute and rubble bags were used. During the tests it was seen that the bags ripped open, leading to individual stones being washed down the slope. To improve durability of the rock bags, a better quality bag should be chosen. Sand bags proved to perform better than jute and rubble bags. This recommendation becomes even more important when recommendation 5 is implemented as well.";"The proposed solution has shown how important correct implementation can be. The left side (looking up to the levee) of the solution was placed more thoroughly; the erosion resistant clay was way more compacted (tamped down) and the rock bags interlocked more successfully. The right hand side washed down quickly after which a significant erosion pit evolved, which eventually led to failure. It must be said that the solution, in all its simplicity, surprised every spectator and expert present for performing the way the solution did. See Report for more information.";;;False;True;True;


All DATA concerning Levee Challenge 2022 - Team RWS - Use of erosion-resistant clay and rock bags
data_type;data_descripion;date_date;data_find;data_media;data_media_find
Powerpoint, video, report;Overview of testing and report;2022-09-01;;Promotional video;https://www.youtube.com/watch?v=Qsik0oQ-QgU
media;;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EorDMcRD5P5PleeQgpmHSz8BO_4iWB0VTjEByOwgDR3YVA?e=bPbv5A;;
report;;;https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/EYVLlh8TexFFhTLXslQo3RwB70yxfJG_vsxgVX3Fukgk_g?e=xdVkSi;;


All EQUIPMENTS concerning Levee Challenge 2022 - Team RWS - Use of erosion-resistant clay and rock bags
equip_type;equip_usage
Overtopping generator;Able to simulate overtopping over a dike.


All SENSORS concerning Levee Challenge 2022 - Team RWS - Use of erosion-resistant clay and rock bags
No sensors added