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.