A discussion of the economic lose caused by land subsidence during the floodgate operation
 
                 
                
                    
                                        
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Abstract
    Through analyzing four representative floodgates on the rivers in Tianjin,conclusion is drawn that 19% of maintenance expense is caused by land subsidence.This conclusion is applied to all of the floodgates in Tianjin and the total lose is estimated as 0.345 billion yuan.
 
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