(Cover-collapse Sinkhole)
Cracks in walls and foundations, doors and windows not closing properly, depressions in surrounding soil, accumulating water and creaking noises can all signal that something is happening below the surface.
(Cover-subsidence Sinkhole)
Changes to the subsurface water profile — including excessive rainfall, prolonged drought and groundwater pumping, changing water drainage patterns and heavy machinery operation — may accelerate sinkhole formation.