floodplain mapping activities on kalona's west ditch - City of Kalona

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• West Ditch, City of Kalona, Iowa: 2.8 mile long • Flood prone areas: flat, low elevation • Objective: Evaluate the result of 2D flood-inundation maps by MIKE21
Unit: Elevation: m Unit: Discharge: m 3 /s Bathymetry Land Use Source Points • 3-meter DEM (Digital Elevation Model) generated from 1-meter LiDAR data by IDNR (Iowa Department of Natural Resources) • 3-meter square grid • Manning’s n value is assigned to the NLCD (national land cover) 2001 dataset • 3-meter square grid • Location • Magnitude • Direction The model output is the result of steady state simulation that includes: • Flow depth, free surface grid • Horizontal and vertical velocity grid
Page 1 and 2: FLOODPLAIN MAPPING ACTIVITIES ON KA
Page 3 and 4: Unnamed Tributary 278 Streams t
Page 5 and 6: Unnamed Tributary 264
Page 7 and 8: 100-‐year floodplain</
Page 17 and 18: STARR Floodplain Boundary
Page 19: Comparison with Depth Grid
Page 30 and 31: Before the burn of DEM

floodplain mapping activities on kalona's west ditch - City of Kalona

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