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Q <br />S <br />• <br /> <br />• <br /> <br />lsoo <br /> , <br />' <br /> i <br />1400 <br /> P ~ <br /> ,~G ` <br />\F <br /> ~ ~\ ' <br />1200 ~ ` ~` <br /> ~~ ~ <br /> Q <br />J j vP <br /> 5 a <br />1 ~' <br />fooa Q ~ <br />`. p. 6 <br /> ' ~~ ~ <br /> ~ ~ '` <br />~ 800 ph <br /> ~ <br /> i 0 <br />2 0• ~ <br /> ~ <br />~ <br />a 600 o; <br /> 0•~ <br /> 0• ~5 <br /> a 2U <br />400 <br /> p,~5 <br /> 0. <br />200 0.0 <br /> <br /> <br />0 <br />0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 <br />PANEL DEPTH (feet} <br />Figure 15-2 Re/ationship of subsidence to width and depth. <br />(NCB, 1975} <br />