Hydrologic and hydraulic analyses of the Grand River, Red Cedar River, and Sycamore Creek near Lansing, Michigan

First posted February 3, 2021 For additional information, contact: Director, Ohio-Kentucky-Indiana Science CenterU.S. Geological Survey6460 Busch Blvd., Suite 100Columbus, OH 43229 The U.S. Survey (USGS) completed hydrologic and hydraulic analyses for selected reaches of the Grand River, Red Cedar Sycamore Creek near Lansing, Michigan, in cooperation with city Lansing. study comprised a 3.1-mile reach 30.3-mile 12.0-mile Creek. information produced from can be used to update expand an existing Federal Emergency Management Agency Flood Insurance Study Ingham County, Mich.Historical streamflow data USGS streamgages on River at Mich. (station number 04113000); East 04112500); Williamston, 04111379); Holt Road Holt, 04112850) were estimate instantaneous peak streamflows floods 10-, 4-, 2-, 1-, 0.2-percent annual exceedance probabilities (AEPs) “1-percent plus” AEP.The Hydrologic Engineering Center’s Analysis System step-backwater model was determine water-surface elevation profiles AEP floods, 1-percent plus flood, regulatory floodway each stream reach. models calibrated based stage-streamflow ratings streamgages. Flood-inundation boundaries 1- probability created stream.