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• <br />• <br />• <br /> DEFINITION OF SYMBOLS <br />Symbol Definition Dimensions <br />S Vertical Displacement (Subsidence) L <br />Sm Maximum Vertical Displacement (Sm=a•t) L <br />S/sm Ratio of Vertical Displacement to Maximum Vertical UL <br /> Displacement <br />Sn Horizontal Displacement L <br />t Coal Extraction Thickness L <br />a = (Smut) Subsidence Factor UL <br />app Subsidence Factor Above Chain Pillars UL <br />SAP=acp,t Maximum Subsidence Above Chain Pillars L <br />d Overburden Depth L <br />Sm/d Ratio of maximum vertical displacement to overburden L/L <br /> depth <br />war Critical Extraction Wdth UL <br />W/d Mining Width to Overburden Depth Ratio UL <br />M Tilt (Slope) UL <br />Mm Maximum Tilt UL <br />C Curvature, the reciprocal of Radius of Curvature rad/L (1/1-) <br />Cm Maximum Curvature rad/L (1/L) <br />E Horizontal Strain UL <br /> (+) is Positive, (-) is Negative <br />Em Maximum Horizontal Strain UL <br />0 Angle of Draw Degrees <br />B Break Angle Degrees <br />B Angle of Major Influence Degrees <br />r Radius of Major Influence L <br />Tetra Tech - 0907171P <br />Vi