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Topic III What Should Be the Interface Between the Science of Hydrologic Extremes and Applications Issues, Such As the Need to Replace Standard Methods, Such As Those Laid Out In Bulletin 17B and Other Methods That Are Based on Stationary Statistical Methods?
Pages 10-12

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From page 10... ... So the recent "scientific finding" of nonstationarity as a central component of flood frequency analysis does not come as news. On the other hand, operational activities seldom if ever consider the very substantial nonstationarities associated with development and other land-use change that we know exist from both science and theory, with the result that flood risk is often greatly underestimated. Read the entire page →
From page 11... ... Several participants noted that discerning regional trends in precipitation is also a challenge. One in particular mentioned that his research group had examined trends in the means of annual maximum of 24 hour rainfall, and found that only about 15 percent of them had a statistically significant change, and of those, about half were up and half were down. Read the entire page →
From page 12... ... Some session participants thought there has been inadequate flood research over recent decades to improve current techniques. One breakout session participant reinforced this point by making an analogy to the area of regulation of toxics relative to human health where no one study seems to have procured changes in regulations. Read the entire page →

From page 10...

... So the recent "scientific finding" of nonstationarity as a central component of flood frequency analysis does not come as news. On the other hand, operational activities seldom if ever consider the very substantial nonstationarities associated with development and other land-use change that we know exist from both science and theory, with the result that flood risk is often greatly underestimated.

Read the entire page →

From page 11...

... Several participants noted that discerning regional trends in precipitation is also a challenge. One in particular mentioned that his research group had examined trends in the means of annual maximum of 24 hour rainfall, and found that only about 15 percent of them had a statistically significant change, and of those, about half were up and half were down.

Read the entire page →

From page 12...

... Some session participants thought there has been inadequate flood research over recent decades to improve current techniques. One breakout session participant reinforced this point by making an analogy to the area of regulation of toxics relative to human health where no one study seems to have procured changes in regulations.

Read the entire page →

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Topic III What Should Be the Interface Between the Science of Hydrologic Extremes and Applications Issues, Such As the Need to Replace Standard Methods, Such As Those Laid Out In Bulletin 17B and Other Methods That Are Based on Stationary Statistical Methods? Pages 10-12

Topic III What Should Be the Interface Between the Science of Hydrologic Extremes and Applications Issues, Such As the Need to Replace Standard Methods, Such As Those Laid Out In Bulletin 17B and Other Methods That Are Based on Stationary Statistical Methods?
Pages 10-12