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<br />. <br /> <br />TABLE IV-l <br />Stability Factors of Safety <br /> <br /> Criteria Recornnended Calculated <br /> Analyzed Factor of Safety Factor of Safety <br /> Full Dam <br /> Bearing Capacity 3.0 15.22 <br /> Sliding 2.5 2.80 <br /> Overturning 1.5 2.23 <br /> Uplift 2.0 3.29 <br /> Empty Dam <br /> Bearing Capacity 3.0 12.18 <br /> Earthquake <br /> Sliding 2.0 2.26 <br />. Overturning 1.25 1.80 <br /> <br />Stability of the Webster Hill Dam is most critical with respect <br />to sliding along the base due to hydrostatic pressure on the dam <br />face (see Table IV-I). Since initial evaluation of the proposed <br />section indicates that bearing capacity is not a problem (factor <br />of safety = 27), sl iding resistance along the base of the dam <br />will be increased using a shear key into the underlying bedrock <br />zone. Keying the dam into bedrock should be considerably more <br />economical than increasing the mass of the dam or a tiedown <br />system. However, all possible alternatives should be evaluated <br />once a more final dam configuration has been determined. <br /> <br />Table IV-l presents a summary of dam-stability factors of safety <br />based on the preliminary dam sect ion. The projected earthquake <br /> <br />e <br /> <br />IV-7 <br />