1. Utilizing LiDAR for Engineering Applications Conservation Our Purpose, Our Passion

2. Objectives Identify some engineering applications Present an Overview for Breach Routing Review a Breach Routing Case Study

3. Utilizing LiDAR Applications include design and planning of physical land modifications or mitigations LiDAR is suitable for planning and in some cases even final design or aspects of final design. Applicability depends on degree of accuracy required. Hydraulic and Hydrology Modeling, Farm Field Terracing Systems, Irrigation Systems, Floodwater Retarding Structures, Grade Stabilization Structures, Water Supply Structures, etc.

4. Surface Modeling Stage – Storage Earthfill & Excavation Quantities

5. Hydrology Modeling Delineation of Watersheds and Water Flow Paths

6. More Modeling Identify and map Flood Frequencies Identify and map hazard areas downstream of structures

7. Inundation Boundary Mapping

8. Structures, Ponds, Lakes

9. Small Structure Case Study Breach Routing a Small Structure to Identify hazards downstream Three data sets: – Traditional Survey – ESRI TIN from LiDAR – ESRI TIN from USGS DEM Accuracy required, Budget, Time Constraints

11. Traditional Process Using Total Station or Survey Grade GPS a survey crew would gather data at each cross section in the field Downloaded with CAD Copied & Entered into Hec-RAS

12. LiDAR Process Using a ESRI TIN developed from LiDAR Extract Valley Cross Sections with Hec- GeoRAS & ArcGIS Immediate file import into Hec-Ras

13. Hec-GeoRas “Pre-Ras”

14. USGS DEM Process Same as LiDAR, except extracting data from the USGS DEM dataset

16. Survey Data Analysis Kept all factors the same, except the differences in the two data sets Cut cross sections exactly at the same spot Utilized the same manning’s N values Hec-Ras Steady State analysis run with TR- 20 flood routing

21. Site H-39a Results Trimble GPS Survey; overtopped Hwy YY by 1.6’ LiDAR Survey; overtopped Hwy YY by 1.0’

23. Hec-GeoRas “Post-RAS”

24. Reference Links Hec-Ras: http://www.hec.usace.army.mil/software/hec-ras/ Hec-GeoRas: http://www.hec.usace.army.mil/software/hec-ras/hec-georas.html TR-60: http://www.info.usda.gov/CED/ftp/CED/TR_210_60_Second_Edition.pdf TR-20: http://www.wcc.nrcs.usda.gov/hydro/hydro-tools-models-tr20.html Ag. Research Service http://www.ars.usda.gov/main/site_main.htm?modecode=62-17-10-00

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