The depth layer that this spatial data represents is the > 0.75 m Surface Ponding Depth (Maroon) layer.
This raster file was created as a result of a 2013 to 2016 study done for the Edmonton area to determine the vulnerable areas of Edmonton in regards to a 1 in 100 year rainfall event.
Due to the constant changing of subsurface infrastructure (adding, upgrading, etc.) combined with the constant changing definition of a 1 in 100 year rainfall event (based on historic rainfall amounts), this raster file reflects the results of a study done in 2016 and should neither suggest previous year’s vulnerabilities nor future year’s vulnerabilities.
There are four different colours to show the depth of water that might pool on the ground during a large rainstorm.
Those colours are:
Green (representing a ponding depth from 0.00 - 0.35 m)
Yellow (representing a ponding depth from 0.35 - 0.50 m)
Orange (representing a ponding depth from 0.50 to 0.75 m)
Red (representing a ponding depth greater than 0.75 m)
For a more information regarding the Flood Risk Maps and the City’s proactive strategy see :
This dataset is based on 2014 information and will not be updated further. The model is based on a theoretical, worst-case scenario storm that has never occurred in the Edmonton area.
For Areas west and central Digital Elevation Model was used from 2004. For the rest of the areas Bare Earth LiDar data was used. The surface data used was set to a horizontal resolution of 2.5 meters with a grid cell of 5m by 5m. This puts the vertical resolution at an accuracy of 0.1 meters.
This is a spline fit interpolations model. This is a 1D-1D model with 2D interpolations.The accuracy of the information provided in these data sets is plus or minus 10 cm vertically, and 10 cm horizontally.
The 100 year flood was based on the 2015 Edmonton 4 year Chicago storm event over 20 plus neighbourhoods. The data is a collection of the worst case scenario of model runs.
This is a common practice for Edmonton drainage models. These models are high level concept and projects determined from this data set will undergo finer, more detailed modeling.
Disclaimer: No Warranty with Flood Risk Maps.
Your use of the flood risk maps is solely at your own risk, and you are fully responsible for any consequences arising from your use of the flood risk maps. The flood risk maps are provided on an “as is” and “as available” basis, and you agree to use them solely at your own risk. There are no warranties, expressed or implied in respect to the flood risk maps or your use of them, including without limitation, implied warranties and conditions of merchantability and fitness for any particular purpose.
Please note that the flood risk maps have been modified from their original source, and that all data visualization on maps are approximate and include only records that can be mapped.
Geo Coordinate System: WGS84
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