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Influence constant n = 1.92 <br /> zone factors a-g beginning with the innermost circle are: <br /> 0 = 0.36 <br /> b = 0.49 <br /> c = 0.80 <br /> d = .107 <br /> e = .159 <br /> f = .171 <br /> g = .047 <br /> The computer code for the implementation of the zone area method was modified to <br /> allow the use of this influence constant and these zone factors in the <br /> calculation of subsidence at Bear Mine #3. <br /> 4.2.2 Compatibility with the "Surfer" Model <br /> The basic computer code for the zone area method was further modified in <br /> order to allow the use of grid files generated by a commercially available <br /> computer contouring program called "Surfer" developed by Golden Software, Inc. , <br /> of Golden, Colorado. The computer code of the zone area program was modified to <br /> allow a grid developed from the digitized surface contours above the mine and <br /> another grid of the coal seam contours developed from the digitized contours of <br /> the "C" seam mining to be input directly into the program (allowing us to <br /> calculate the site specific overburden thickness at each grid point) . <br /> Furthermore, output from the program consisting of calculated subsidence at each <br /> grid point, overburden thickness, and the calculated final surface elevation are <br /> produced in the form of grid files that are compatible with the "Surfer" program <br /> and may be read directly into the program for contouring. <br /> r. <br />