topic Re: An error occurs when running the Build Walls tool. in Water Resources Questions

An error occurs when running the Build Walls tool.

TaoChenalan — Tue, 06 Aug 2024 21:04:58 GMT

When running the Build Walls tool, the generated wallDEM.tif raster is incorrect, and the elevation range becomes infinite and infinitesimal.

Re: An error occurs when running the Build Walls tool.

MarkBoucher — Tue, 06 Aug 2024 22:06:07 GMT

I've had this happen. Check the your projection/coordinate system is the same for all layers.

I put the agreestream and innerwall layers in a geodatabase and that seems to "help" (I've used ArcMap Desktop, so maybe ArcPro is different).

A side note: I see you have 0 for your wall and breach buffers.

When I use walls and breaches I always use at least a 2 cell buffer for the walls. I only need one cell for the breachbuffer. The image below shows that with only 1 cell for the wall buffer, you can get "leaks" (orange line) since the flow direction grid will "see through" the wall where the non-walled cells meet at the corners (diagonals).

Mark

Re: An error occurs when running the Build Walls tool.

TaoChenalan — Wed, 07 Aug 2024 08:31:29 GMT

hello, Mark.It works, thank you. It seems we need to define the coordinate system before drawing the "wall"

Re: An error occurs when running the Build Walls tool.

DeanDjokic — Sat, 10 Aug 2024 00:07:15 GMT

Please review document: "Arc Hydro - Project Development Best Practices".

https://community.esri.com/t5/water-resources-documents/arc-hydro-project-development-best-practices-pdf/ta-p/920431

To ensure proper behavior of Arc Hydro tools (AH), your vector and raster data should be using the same coordinate system (ideally a PCS). While some AH tools might work when that is not applied, there is no guarantee across the board. The document also goes through several other pointers that will make your life easier when using AH (and in general any GIS) tools.