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Riverscapes / pyBRAT

pyBRAT - Beaver Restoration Assessment Tool (Python)
http://brat.riverscapes.xyz
GNU General Public License v3.0
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No durational flow values for South Dakota #272

Closed andrewsechrist100 closed 5 years ago

andrewsechrist100 commented 5 years ago

Hello ETAL,

I spoke with an employee of SD USGS today and he told me that SD does not calculate durational flows (i.e. flows exceeded a certain proportion of the time - 80% suggested for iHYDE), only peak flows. I've looked over gage point data, and this is accurate. Will this make the BRAT model impossible for me to utilize or are there ways for me to still get through the iHYDE step of the process? Thank you,

Andy Sechrist

banderson1618 commented 5 years ago

iHyd is not critical for the model. It primarily gives us information on how powerful a stream is, which tells us when blowouts happen, but this is not generally the limiting factor, depending on what streams you care about. Using default iHyd values will still give a useful model, even if not necessarily ideal.

andrewsechrist100 commented 5 years ago

Well, that is definitely good news. Thank you Braden. I had submitted another question on 3/26. It looks like it is Issue #270 in Riverscapes / pyBRAT. Bangen had issue my initial question on this Issue and got me over a hump, but I haven't heard about the second. The second involves an error I am getting: "the Geometry contains no Z Values." Is it possible for you to look into that? In any case, thanks again, Andy Sechrist On Monday, April 1, 2019, 1:31:06 PM CDT, Braden Anderson notifications@github.com wrote:

iHyd is not critical for the model. It primarily gives us information on how powerful a stream is, which tells us when blowouts happen, but this is not generally the limiting factor, depending on what streams you care about. Using default iHyd values will still give a useful model, even if not necessarily ideal.

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mhallerud commented 5 years ago

@andrewsechrist100 This is a common issue especially when running in a Python GUI instead of ArcMap and when shapefiles are manipulated between BRAT steps. The Z-values essentially represent elevation. You can either add Z-values (see this ESRI help post) or disable the warning in Python using arcpy.env.outputZFlag = "Disabled". Having no Z-values should not impact the results.