Estimation of Flood Flows on the Big Sioux River between Akron, Iowa, and NorthSioux City, South Dakota

摘要

The purpose of this report is to present estimated flood flows for the 10-, 50-,100-, and 500-year recurrence intervals at selected locations on the Big Sioux River between the Akron streamflow-gaging station and North Sioux City. Various methods were used to define a range of flood flows that could be expected for the various recurrence intervals. The estimated flood flows are presented to support a FEMA Flood Insurance Study for a portion of Union County and for North Sioux City.