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Surface and Datum <br />500 S -- - -- <br />1000 \ �` 5max r -- <br />.1500 <br />20'00j mm Subsidonce <br />h PfOilles / a <br />t-j Subsidence Cs) « h H <br />Ln 4 h � <br />m 4 h <br />i� Crltleal Area <br />Super— crlticel Area <br />cc—Angle of Draw <br />h —Depth <br />m— Mining Thickness <br />z <br />E <br />Trough Subsidence Nomenclature (Adapted from Subsidence <br />Ennineers Handbook, National Coal Board, 1975) <br />r _ <br />tr <br />w <br />0 <br />w <br />