Why lay non-woven fabrics and then put sandbags on the flood?

Flood-resistant non-woven fabrics are mainly used to prevent water infiltration from damaging the foundation.

In flood fighting and emergency rescue, the main purpose of laying non-woven fabrics is to prevent flood infiltration, which will loosen the foundation and make the sandbags pressed on the foundation unstable. In addition, laying non-woven fabrics can also prevent ants from drilling holes to destroy the foundation after the flood.