a severe increase in subsidence. you mentioned earlier don't have this three d. model shows how subsidence occurred at different times. of the late that you mentioned here you can see what happened between the one nine hundred sixty s. and two thousand and ten and the mention you can see this of sidelights have been worsening steadily until the implementation of efficient measures to slow it down and keep its evolution under control but how they got there what. a coach. it was only in the one nine hundred sixty is that laws were created to regulate the pumping of water the chinese were the first to recognize the scale of the subsidence. subsidence is a reversible once. it poses a significant threat skyscrapers. and it also has an impact on urban