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Stephen Nelson, P.E., M.ASCE
Coal Creek Envtl Assoc
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RE: Return Periods of (Mixed) Extreme Events
Posted By
Stephen Nelson
11-07-2017 10:59 AM
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Environment, Coasts, Oceans, & Infrastructure
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A quick reaction to your summary is that this seems to me very similar to the approach taken in defining probable maximum precipitation. Pulling my old college hydrology textbook ("Hydrology for Engineers", by Linsley, Kohler, and Paulus, 1958 edition) I note that for the Houston area, the probable maximum ...
RE: Oroville Dam - worst case scenarios
Posted By
Stephen Nelson
02-20-2017 08:28 PM
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Environment, Coasts, Oceans, & Infrastructure
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In my opinion, the channeled scablands in eastern Washington suggest that we can't simply assume that bedrock will resist erosion during cataclysmic flow events. The Columbia Basin coulees show the tremendous incisive power into bedrock of a massive flow once channelization in bedrock starts to develop ...
RE: Oroville Dam - worst case scenarios
Posted By
Stephen Nelson
02-17-2017 03:41 PM
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Environment, Coasts, Oceans, & Infrastructure
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The crest of the Oroville dam is higher than the top of the ridge where the spillways are located. That is a good design feature - it is almost impossible for the dam itself to be overtopped. Thus, the worst case scenario is not a complete emptying or the reservoir; rather the worst-case scenario ...
RE: Re: Engineering Ethics. Case Study 1
Posted By
Stephen Nelson
02-14-2017 10:17 AM
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Environment, Coasts, Oceans, & Infrastructure
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In my opinion, if I am not making occasional mistakes,I am stagnating and failing to advance my skills. I try to think of "mistakes" in three categories. The first is "informed decisions" that don't work out. In one sense, those really aren't mistakes. A decision is made to use an approach that ...
Oroville Dam - worst case scenarios
Posted By
Stephen Nelson
02-14-2017 10:17 AM
Found In
Egroup:
Environment, Coasts, Oceans, & Infrastructure
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What a situation! And what lessons that will need to be learned and applied! For the moment, I want to discuss what I have been able to gather (from general media) about the supposed worst case scenario. The worst case scenario appears to be a failure of the emergency spillway structure, which is ...
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