The damage created during the B-OF05 test, was repaired with an infill of rock bags. Later, this area has been subject to further investigation. The description of the design, emplacement and performance of this damage repair solution is outside the scope of this report.

Overflow was performed and it was found that animal burrows facilitated the flow of water under the cover layer, into the rock filled void. To better understand the role of burrows in this setting, several activities have been performed and have been separately reported in Hölscher et al. (2021). The main finding for the B-OF05(B) test site was that the entry point of water inflow into the levee was situated near the side of the road. The flowing of the water underground could be heard underneath the rock bags. At a later stage, the flow pathway was further investigated and was identified as a mole burrow which connects the surface to the sand core. Part of the burrow system was grouted and excavated.