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HAZUS-MH FAQs: Flood Model Operation and Analysis

I computed Stream Network/Hydrology/Hydraulics for a Study Region. I then deleted all previous scenarios and computed the Stream Network/Hydrology/Hydraulics again with a different Drainage Area. Now the Chosen Reaches and their corresponding depth grids seem to be out-of-sync geographically.



To speed up hydraulic processing a cache was added to the Flood Model that stores depth grids for each reach before they are merged at the end of the hydraulics process.  Subsequently calculating a Stream Network with a different Drainage Area yields a different synthetic stream network with different reach indices, which match up correctly with depth grids generated by a new hydraulics run, but incorrectly with the previous depth grids, which are not overwritten.

As a workaround, prior to performing Delineate Floodplain, a user should navigate to the cache of depth grids from the previous run in the Study Region's subdirectory folder called Hydraulics and delete it:

Image of folder structure screenshot

For additional information, the HAZUS User's Manuals and guidance materials are available for download from the HAZUS Resources on this site.

Need Additional Help?
Email: HAZUSGenHelp@nibs.org for general questions about HAZUS
HAZUSFloodHelp@absconsulting.com for Flood Model questions

Last Modified: Monday, 21-Sep-2009 15:00:44 EDT

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