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• <br />Table <br />PROTECTION CATEGORIES OF SURFACE SUBSIDENCE IN POLAND <br />(Compiled from Abel, et al., and 2ilavy) <br />Cate- Description of Surface Allowable <br />gory Objects and Installations Strain <br />E x 10-3 <br />I Dams, skyscrapers, princi- 1.5 <br />pal shafts, power plants, <br />etc. <br />II Hospitals, schools, pipe- 3.0 <br />lines, etc. <br />i III Two story buildings, high 6.0 <br />i Voltage towers, roads ~ <br />t~ -- - - - --- -~ --- -- <br />IV One story uui~tlinys 9.0 <br />I <br />I ~ <br />I <br />Allowable Damages <br />Tilts (Slope) <br />G x 10-3 <br />2.5 Slight damages such <br />5.0 <br />10.0 <br />15.0 <br />as hair line cracks <br />in plaster are <br />allowable. <br />Small repairable <br />dam;.ges are <br />allowable. <br />rAllowable are ~ <br />damages that do not j <br />destroy the building ~ <br />or impair its <br />service. <br />f4ovements are such that <br />' completely reinferce~ <br />structures are <br />required to resist ~ <br />them. i <br />