Reconditioning problem

10-04-2018 05:35 AM
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New Contributor


Im relatively new to using HEC-GeoHMS. I have used ArcGIS on previous projects but am now intending to use HEC-HMS to produce a hydrological model so am planning on doing my pre-processing on  HEC-~GEOHMS in ArcMap. 

I have read into the process and feel I have a basic understanding on how to carry it out. However when reconditioning and filling sinks on my DEM I am encountering a problem where a large black region is being identified (See attached photo with red circle) when in my original DEM this is not a low point or resevoir etc. Furthermore the entire stream network shape is not appearing on this reconditioned DEM. I am struggling to resolve this problem area so was wondering if someone could provide any advice to a new user?

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Esri Contributor

I am not sure about the large black region. Would need to check the data to see what is going on. What is the updated value in there?

As for the streams, did you use vectors or rasters as input? If vectors, was  there a selected set?

Christine Dartiguenave

Esri Water Resources Team

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