Information distortions

In Durgerdam, most houses are built on a foundation on steel (without piles). Normally, this type of foundation belongs on sandy soil. In Durgerdam the subsoil consists of (weak) clay and peat soil. It is possible that the house will subside more and more over the years, because the ground under the house is also subsiding. This kind of subsidence is also called autonomous subsidence: this autonomous subsidence can lead to autonomous deformations of the houses that occur without any certain (human) actions preceding it. We see from previous measurements that the autonomous subsidence of some houses is substantial.

In addition to these autonomous deformations, (additional) deformations may occur (relative deformations) as a result of the work. An example of this is work on the dike: dike reinforcement is radical and can affect buildings on and along the dike. Because we want to minimize the chance of inconvenience and damage, it is necessary to look closely at deformations.

Earlier, a working group was established around the issue of subsidence. This resulted in a draft plan of approach. Meanwhile, this has been developed further and incorporated into the plan of approach Future-proof Durgerdam and the working group as such is (now) no longer active.