. Deep borehole surveys and problems. Boring. PROBLEMS 249 2. The Borehole Is on the Upstream Side of the Outcrop but the Stratum Dips Away from It (Fig. 166).âHere we get L ^ H -h or L = H - AB' sin d^ tan 5 (21c) NoTE.^In this case h must be less than l_ J^'vl B' 'â h = -AB'5ine2+nn(5 Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haddock, M. H. (Marshall Henry). New York, McGraw-Hill

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