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I Sanborn Creek Subsidence Page 49 September 2, 1997 <br />I APPENDIX B. GRAPHS USED TO PREDICT SUBSIDENCE EFFECTS <br />1) Vertical subsidence correction graph for longwall panel width <br />with respect to depth (NCB, 1975) <br />2) Subsidence profile construction graph for panel specific <br />width/height ratio, distance from panel centerline in terms of <br />depth and proportion of maximum predicted vertical subsidence <br />and at that distance from the panel centerline <br />3) Maximum extension (+E) and compression (-E) multipliers for <br />panel corrected maximum vertical subsidence divided by panel <br />depth for the specific panel width/panel depth conditions <br />9) Horizontal ground surface tensile and compressive strain <br />profile construction graph for panel specific width/height <br />ratio, distance from panel centerline in terms of depth and <br />proportion of maximum predicted horizontal tensile (positive <br />values) compressive (Negative values) and at that distance from <br />the panel centerline <br />J <br />J <br />99 <br />