Similarly, changes in the moisture content (by increasing it due to leaking mains and drains or by the removal of trees, or decreasing it by introducing drainage paths due to neighbouring excavation or by further growth of trees) can disturb the state of equilibrium of the soil/foundation interaction. An interesting case, investigated by the authors’ practice, was the deforestation of land uphill of a factory.
The increased rain water run-off seriously affected the basement of the factory.
The construction and loading of new foundations may disturb existing buildings. The rising level of the water-table in cities due to the cessation of artesian well pumping is also causing problems (see Chapter 4 on topography, and CIRIA Special Publication 69, The engineering implications of rising groundwater levels in the deep aquifer beneath London).