Terrapoint
Flood Risk Mapping – Plan Mitigation and Mediation

LiDAR surveys are one of the quickest and most accurate methods to produce an accurate DEM. Using the LiDAR derived DEM, hydrologists are able to predict flood extents and plan mitigation and remediation strategies.

The reliability of flood risk mapping and H and H (Hydraulic and Hydrologic) modeling is dependent on the accuracy of the terrain elevation data used. This is especially true for modeling in areas of little terrain relief. For example, in a flat river basin such as the Red River in Manitoba and North Dakota, a slight increase in water level can flood a large area. This may mean that many communities would be affected by a rise in water level. In areas with more relief, the accuracy of the DEM is not as critical, but knowledge of slope and aspect can aid considerably in predicting water volumes and  flow characteristics.

Testimonials

The following is an excerpt from the IJC’s final report “Living with the Red”, and is based on the results of LiDAR surveys done in the region:  “The Task Force found that current mapping of high risk areas was not adequate for modeling and analysis of flood risk, or for the consideration of flood protection options. Among other things, the Task Force produced high-resolution digital elevation data for the lower PembinaRiver and for the area south of the Winnipeg Floodway, and analyzed data collection technologies.  Through these efforts, the Task Force found that airborne laser mapping can be a fast, reliable, and cost-effective method of obtaining three dimensional data suitable for the creation of a digital elevation models (DEM).”

Services and Data Products

1. Accurate DEM
2. Model terrain relief
3. Ortho-photography
4. Slope knowledge
5. Shoreline mapping
6. Erosion control
7. Change measurement
8. Land use classification
9. Structure and facility risk management

Shoreline erosion

Slope, Streams, and contours

 

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