Hydrologic Analyses Rush Creek and the Root River in the Vicinity of Rushford and Houston, Minnesota and Hydraulic Analysis Rush Creek in the Vicinity of Rushford, Minnesota

摘要

This report presents the hydrologic analyses for development of discharge-frequency relationships for Rush Creek near Rushford and the Root River near Houston, Minnesota. These analyses were performed as part of the ongoing flood recovery effort from the August 2007 flood event. The discharge-frequency curve for Rush Creek has not been updated since 1975, and the curve for Houston has not been updated since the 1992 General Design Memorandum for the Houston flood damage reduction project. The new analyses include all of the intervening years of record and the provisional flood peaks from the August 2007 flood event that occurred in this region. The 2007 peak flows are the floods of record at both locations; 38,400 cubic feet per second (cfs) for Rush Creek near Rushford and 46,000 cfs for the Root River near Houston, respectively. The methodology used for this study is in accordance with the general guidelines for discharge-frequency analyses as provided by the Federal Emergency Management Agency (FEMA) in 'Guidelines and Specifications for Study Contractors' for flood insurance studies, dated April 2003. The methods used are also in accordance with Bulletin No. 17B, 'Guidelines for Determining Flood Flow Frequency,' of the Interagency Advisory Committee on Water Data, dated March 1982 and current Corps of Engineers criteria. This report was prepared in cooperation with technical experts from the Minnesota Department of Natural Resources and the U.S. Geological Survey, Minnesota District. Provided below is a summary data table of discharge values.