Lec. Dr. Riyadh Abd Al-Abbas Ali<br />Subsidence of foundations is the result of exposure of the soil that supports these foundations to water, which affects the properties of the soil<br /> Which leads to changing its shape and size with the help of the loads that are imposed on it, and the reasons for this are many:<br />1- Not examining the soil and taking the necessary precautions.<br />2- Not choosing the appropriate type of foundation, such as (separate, joint, mat, cantilever...).<br />3- Water leakage from adjacent manholes, sewers or water tanks.<br />4- The emergence of new excavations nearby, which changes the soil stresses.<br />5- Not compacting the soil well.<br />6- Using construction waste, rubbish, etc. to neglect landfilling.<br />The most important signs of subsidence in buildings are:<br />1- Cracks appear in the walls and sides of columns.<br />2- Separation of walls from ground floors.<br />3- Fractures occur in window glass and doors do not fit properly.