Generated files for wrf-hydro arcgis preprocessor

[Bai]

Hi all, 

I have generated zip files using wrf-hydro arcgis preprocessor, then I put the zip files into ‘examine outputs of GIS preprocessor’. In the generated zip file, I found that there are some places in the flowacc where there is a break in the flow, and the rivers that should be connected are disconnected, so the generated sub-basin area is much smaller than the actual area, how can I solve this? I hope someone can help me.

Thanks！

[Kevin Sampson]

When you see disconnected stream networks, this usually means that the pit-filling algorithm did not fill all pits in your input DEM. You can pre-process your DEM to fill pits, or you can change the default max pit filling depth ("z_limit" in the python script), which is set to 1000m. Using an input DEM that has been hydrologically pre-processed can help, but the regridding from your DEM resolution to the WRF-Hydro routing grid resolution can also introduce pits.

Is it possible that the vertical units of your DEM are something lice cm or mm? Please ensure that your vertical units are in meters.

Thanks,

Kevin

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[Bai]

Kevin, thanks for the reply.

I will retry as you suggested and hopefully it will resolve. Thanks again for your advice!