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Utilizing LiDAR for Engineering Applications

Utilizing LiDAR for Engineering Applications. Conservation Our Purpose, Our Passion. Objectives. Identify some engineering applications Present an Overview for Breach Routing Review a Breach Routing Case Study. Utilizing LiDAR.

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Utilizing LiDAR for Engineering Applications

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  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

  10. 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

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

  12. Hec-GeoRas “Pre-Ras”

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

  14. 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

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

  16. Hec-GeoRas“Post-RAS”

  17. 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

  18. Helping People Help the Land The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.

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