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I I I I I I I I I I I I I I I I I I I I Flood Insurance Stul:\y Work Mlij) · Base sheet: USGS Quadrangle map (1971) · Contours interval: 10 feet . Scale: 1 inch = 500 feet . Datum: 1927 North American Datum · Work map developed by Omaha Corps in September 1989 · loo-year and 500-year flood boundaries and floodway plotted on map · Water surface elevations plotted at 2 foot intervals · Preliminary or surveyed HEC-2 cross sections plotted Flood Insurance Rate Mlij) (fIRM) . Published by FEMA · Map date: Revised on May 2, 1991 . Contour interval: No contours · Scale: 1 inch = 500 feet . Datum: National Geodetic Vertical Datum of 1929 · Regulated 100-year and 500-year flood boundaries and floodway plotted on map · Water surface elevations plotted at 1 foot intervals · Cross sections plotted (extended sections) · Roadways and street names are shown along with flood insurance zones Flood Dike Restoration - Plan and Profile · Developed by DGR Engineers for levee construction · Map Date: July 28, 1994 · Contour interval: 1 foot · Scale: I inch = 30 feet · Datum: Mean Sea Level (verbal confirmation from DGR) · Bench Mark: Top/operating nut of fire hydrant on east side of North 3rd A venue, south of swimming pool Aerial Photoiflij)h of Rock Rlij)ids. Iowa . Map Date: April 3, 1990 · Scale: 1 inch = 1000 feet Several issues that were discovered during the course of Ibis study should be pointed out regarding the available mapping. According to the 1991 FIS, surveyed cross- sections for use in the hydraulic model were provided by the city of Rock Rapids. The surveyed cross-sections are tied to Mean Sea Level (MSL) datum, and therefore the water surface elevations as computed by the HEC-2 model, published in the FIS, and 6