Creating Hazard Grids

[Anonymous]

I am currently trying to come up with a methodology to calculate hazard grids using the UK formula (D*(V+0.5)+Debris Factor).

As an output HEC-RAS can do D*V. Can this be altered using the controller?

Any ideas would be much appreciated.

Cheers
The RAS Lad

[Mark]

I’m just promoting this as its a good question which i don’t have the answer for

[Scott Miller]

Raster Math in ArcGIS is useful to calculate new grids from model output. I’ve done this with WSEs to calculate and map change of WSE, between existing conditions and potential construction alternatives. The math is straight forward, but working with rasters can be tricky. If you want to try this route, I’ll provide tips.

If you want to map categories with maximum thresholds bounding the D*V product, it can be done with basic logical conditions.

[Author]

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