Iowa lawmakers search for answers following flood
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#1 Aug 30, 2010
Enclosed is the provisional data from the USGS gauge in Manchester. It has been revised and will be revised/reviewed a couple more times before final determination.
The USGS has revised downward the peak flow from:
An initial peak flow (during the flood event) of 35,000CFS at 10:30AM on July 24, 2010.
To a peak flow (after the flood event) of 28,000CFS at 12:45PM on July 24, 2010.
To the present (after remeasurement) peak flow of 24,900CFS at 12:45PM on July 24,2010.
The peak flow and record was 26,000CFS on May 23, 2004.
The USGS states, "Despite a peak of record gage height of 24.48 ft, the July 24th peak discharge of 24,900 cfs is lower than the peak of record discharge of 26,000 cfs observed on May 23, 2004 (corresponding gage height of 21.66 ft). Due to continuous changes to the channel configuration, it is not uncommon for the peak of record gage height and peak of record discharge to occur during different flood events. For a complete list of annual peaks for this streamgage, visit the link below."
This suggests that the failure of the dam was operator error and not "... an Act of God rate." (of water) as asserted by Mr. Willey of the Lake Delhi Recreation Association on 8/23/10.
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