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Generate Flood Planning Layer

JohnSpry1

I have several flood depth rasters (floating point) from different flood studies and a dem (floating point).

The idea is to generate a flood planning layer (flood depth raster + 0.5m) using the flood depth rasters and a dem (floating point).

In raster calculator I did "Con("flood_depth_raster","dem")" which gave me the extent of the flood depth raster with the dem values.

Does anyone know a way to add 0.5m to this and fit to the dem?

Then i will create a flood planning level polygon from the raster to use in the gis in further analysis.

Thanks, John

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JohnSpry1

Thanks for the link Dan, I am looking at the script trying to figure out if it will work for my task.

Question:

In the python script under settings the line "nSourceElevation = 100 # The elevation corresponding to the source body" seems to use a static height?

What figure would could I use when the flood_depth_raster I have has a range of 0.6 - 50.2 AHD as you travel up the catchment?

DanPatterson_Retired

Xander Bakker‌ translated Bill Huber's original 2001 post which has been widely to simulate a flood.

See this link and Xander's python code

https://community.esri.com/thread/84057

JohnSpry1

Thanks Neil, apologies for not giving a better description of my overall problem.

Your answer is helpful and adds 0.5m to the vertical depth but I am also trying to stretch the flood_depth_raster horizontally to the dem so the extent expands as well.

Ultimately I will create an extent polygon from the new raster.

Any further ideas would be much appreciated.

NeilAyres

What you are saying here with this statement :

"Con("flood_depth_raster","dem")"

Is something like IF (flood_depth_raster is not null or empty, then return the dem raster, there is no else returned).

This would be more properly stated as something like :

Con(IsNull(flood_depth_raster), flood_depth_raster, dem)

I think you can just add the 0.5m to the output like :

Con(IsNull(flood_depth_raster), flood_depth_raster, dem + 0.5)

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