Biophysical table for urban flood mitigation

hi sir/mam, could u please explain about the bio physical table and its component like Curve numbers. how can i get the data for it and how to prepare it.

Thanks in advance.
Regards,
Gowtham D.

Hi @DGowtham -

Have you checked out the User Guide chapter for Urban Flood? There’s a Data Needs section that gives a description of the biophysical table, and an Appendix that points to one general source of curve number values. When you installed InVEST, you may also have installed sample data, which gives an example of how the inputs should look, so you can use that as a template for creating your own data. If you did not install sample data when you installed InVEST, you can get the sample datasets from the InVEST web page.

It’s always good to try and find data that’s more specific to your study area. For curve numbers we do a literature search and see what others recommend for a similar place or land use/land cover types. In particular, government agencies who work with roads, construction and hydrology in general might have recommendations for values to use.

You also might find recommendations by searching this forum for previous posts related to curve number.

~ Stacie

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sorry mam. i forgot to say thanks for this post. Thank you. And I got an another problem. when i am trying to attach my soil hydrological group raster file in the INVEST user interface its not supporting and not uploading.

Help me out with that. Please find the screenshot.
Regards,
Gowtham.

Hi @DGowtham -

When you click on the red X to the left of “Soils Hydrological Group Raster” what does it say? You should see a brief message explaining what’s wrong.

~ Stacie

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Thanks for ur reply mam. its shows “dataset must be projected in linear units”

Regards
Gowtham

Ok, then that’s the issue. Check the coordinate system of that raster, it is likely in a geographic coordinate system. Reproject it to be in the same projected coordinate system as your other inputs that do not get that error, and see if that fixes the problem.

~ Stacie

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Hi mam.i hav tried to change the to the coordinate system. Its not helping. Could you please share any video tutorial or anything related to the the issue.
I have tried various
Methods.

Thanks in advance.
Gowtham…

Hi @DGowtham ,

I have tried to change the to the coordinate system

Could you describe the steps you took to do this? Changing the coordinate system and projecting to a new coordinate system end up being two very different things. Changing the coordinate system will simply update the metadata but have no effect on the raster itself. Projecting or reprojecting a raster will change the raster in space and have an updated coordinated system to match.

Here’s a youtube video showing how to reproject a raster in QGIS:

Doug

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Thank you sir. It worked.

Regards,
Gowtham

1 Like