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L.R. Penino Page 15 pril 27, 1993 <br /> 3) The least likely mode of bulkhead failure is structural failure <br /> of the bulkhead. There is no historical record of such a failure. <br /> Even if a bulkhead were to be displaced downstream and high <br /> pressure impounded water were forced around the plug the flow rate <br /> would still be restricted by the mass of the bulkhead blocking the <br /> tunnel. <br /> I believe the final question about warning signs of impending <br /> bulkhead failure, namely increased water flowing downstream of the <br /> bulkhead, has been previously addressed. <br /> I hope that I have answered the questions raised. <br /> Sincerely, <br /> Y4 <br /> John F. Abel, Jr. <br /> Colorado P.E. 5642 <br />