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To evaluate the effects of the 1993 flood in the upper Mississippi River Basin on the determination of flood magnitude and frequency, discharges that had recurrence intervals of 10, 25, 50, and 100 years computed from data through the 1992 water year were compared with those computed from data through the 1993 water year for 62 selected streamflow-gaging stations in Iowa. On the basis of the flood-frequency analysis computed from data through the 1993 water year, a flood that was greater than or equal to a 10-year recurrence-interval discharge occurred during 1993 at all 62 gaging stations, and a flood greater than or equal to a 100-year recurrence-interval discharge occurred at 11 of the gaging stations.
Compares the results from applying four regional flood frequency methods to flood data collected at 131 gaging stations in Iowa; and appraises the reliability of each method.
The flood that affected a third of the United States during the summer of 1993 was the nation's worst, ranking as a once-in-300-years event. It severely tested national, state, and local systems for managing natural resources and for handling emergencies, illuminating both the strengths and weaknesses in existing methods of preparing for and dealing with massive prolonged flooding. Through detailed case studies, this volume diagnoses the social and economic impacts of the disaster, assessing how resource managers, flood forecasters, public institutions, the private sector, and millions of volunteers responded to it. The first comprehensive evaluation of the 1993 flood, this book examines the way in which floods are forecast and monitored, the effectiveness of existing recovery processes, and how the nation manages its floodplains. The volume concludes with recommendations for the future, in hope of better preparing the country for the next flood or other comparable disaster.
Flood-elevation profiles and flood-peak discharges for floods during 1972, 1982, and 1987 in the Nishnabotna River basin are given in the report. The profiles are for the 1972 flood on the West and East Nishnabotna Rivers, the 1982 flood on Indian Creek, and the 1987 flood on the lower West Nishnabotna River. A flood history describes rainfall conditions and reported damages for floods occurring 1947, 1958, 1972, 1982, and 1987. Discharge for the 1982 flood on Indian Creek is 1.1 times larger than the 100-year recurrence interval discharge.