Everything about Levee Challenge 2021 - Team KU Leuven - Use of Coconut Tensile Grid Mat
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
94;Levee Challenge 2021 - Team KU Leuven - Use of Coconut Tensile Grid Mat;Exercise;The Levee Challenge was a physical challenge in which groups of students were asked to repair the outer slope of a damaged grass covered levee.;True;False;True;True;False;False;2021-02-24 08:00:00;2021-02-26 17:00:00;3;;The damage had to be repaired within a time frame of 4 hours. Testing happened in the following days.;IV;51.341954;4.23771;;Test section on Belgian Levee. The slope is assumed to be 1:3.;;The Levee Challenge was a physical challenge in which groups of students were asked to repair the outer slope of a damaged grass covered levee against overflow.;The use of a Coconut Tensile Grid Mat as an emergency measure.;Lower part of the levee was damaged by heavy traffic. Prior to the tests, 2 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).;"08:45 –09:15|| 30 minoverflow test at 350 l/s. 
09:15 –09:20 || 5 min rest to inspect the repair solution and rest of the dike surface. 
09:20 –09:50|| 30 min overflow test at 500 l/s. 
09:50 –09:20 || 5 min rest to inspect the repair solution and rest of the dike surface. 
09:55 –10:25|| 30 min 600 overflow test at l/s. 
10:25 –10:30 || 5 min rest to inspect the repair solution and rest of the dike surface. 
10:30 –11:00|| 30 min overflow test at 700/740 l/s. 
11:00 –11:10 || 10 min rest to inspect the repair solution and rest of the dike surface and make tear of 1 m into lower repair area (at location where water exactly hits the sheet at the bottom). 
11:10 –11:40|| 30 min overflow test at 350 l/s. 
11:40 –11:45|| 5 min rest to inspect the repair solution and rest of the dike surface. 
11:45 –12:45|| 60min overflow test at 700/740 l/s.";;;;"For the first test the solution is subject to a flow rate of 350 l/s. This flow rate is set for 30 minutes. After these 30 minutesthere is no visible damage to the mat or the underlying grass layer. On the edges of the mat there is some unraveling of the fibers. This does not cause any damage because the mat is folded double on the edges,and they are anchored in the ground.  On  top  of  the  levee  there  is  a  little erosion,and  the  grass  cover  is  flattened.  This  has  no consequences for the stitches of the mat. This can also be sediment that precipitates that has been sucked up by the pump.
After the first test the water flow rate is increased to 540 l/s. This flow rate is also set for 30 minutes. As  a  result  of  this  test,  there  is  a  little  change  visible.  The  mat  is  stretched  because  of  the  water friction. This causes bumpers at the anchoring pointsin the mat.
In the middle of the levee at the height of the overlapping, the mat starts to unravel. This damage does not get worse with subsequent tests. 
For a flow rate of 600 to 700 l/s, there is an increase of the bumpers on the anchoring points. 
At the bottom of the levee there are some sandbags that moved. This movement is caused by the water that flows under the mat.";The removal of the repair works can be done quickly. By loosening the mat from above, it can be slowly rolled down. By rolling, the anchor pins come loose and can be detached from the mat. In this way, no pins will remain in the levee.The clean-up works were completed within ±30 minutes.;See Report for more information and pictures.;We  can  conclude  that  the  chosen  method  is  certainly  sufficient  to  protect  the levee.  During  the implementation wealsodiscovered a few things. For example, it could be decided that the provided planks that we wanted to place on the sidesarenot practical and also not necessary. The use of the U-pins is also not very practical and can also be omitted. The method used is easy,quick to installand protects the whole levee. Another plus is that the coconut mats and sandbags are biodegradable. The only non-degradable material used are the anchoring pins. These are made of steelbutarefully reusable.If you look at the price it can also be said that this is a fairly cheap solution. Another advantage is that thismatcan also serve as a long-term  protection forthe levee.  This  way  the  levee  is  protected  against  a short-termflooding  but meanwhile repairs itself over the next 36 months until the mat is fully degraded. We have approached various companies in the choice of materialsand they allpresented different options. For  the  damage  that  has  occurred  on  this  leevee  the  reparation  price  per square meter would be 14,04 euro. This is only the price for the materials. The work-and manhours have  yet  to  be  settled.  However,  as  already mentioned,  we  can  state  that  this  solution  does  not require any heavy tools or materials. The additional costs will therefore not be immense andthere is still apossibility to further optimize this process.We also want to promote that this method, apart from the fact that it can be used several times, can also  be  used  as  a  permanent  solution.After  some  time,  whenroots  have  grown  through  the geotextile, an intertwined system with increased erosion resistance is formed.;;;False;True;True;


All DATA concerning Levee Challenge 2021 - Team KU Leuven - Use of Coconut Tensile Grid Mat
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=pqnlJtZzXgA&t=6s
Report;;;https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/EWZ0ItYxZSxMi9n86NiSDsEBA1Sff_EbffPK6hdeSdQZog?e=ha04kl;;
Media;;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EiCXNUTBtlZGm5CUMxiJlnQBfpGpwLhAaY_zpW0pYwQAzg?e=JwuZLn;;


All EQUIPMENTS concerning Levee Challenge 2021 - Team KU Leuven - Use of Coconut Tensile Grid Mat
equip_type;equip_usage
BA300 pump;Overflow generator


All SENSORS concerning Levee Challenge 2021 - Team KU Leuven - Use of Coconut Tensile Grid Mat
No sensors added