[GRASS-user] Interpreting r.watershed accumulation map

[Laurent C.]

Hello Rich,

First some remarks about your entry data:
- Your rainfall rate is very small. For your entire simulation of 24h,
it will rain only 0.24mm on your domain. Since the depth values under
the 'hmin' threshold are not output, you'll end up with empty output.
If you want to see flow patterns, set this value to at the very least
10mm/h. 100 if you want to have faster result (without the need of
simulating 24h)
- By setting bctype=4 and bcvalue=0 on all your region, you're forcing
a water depth of zero everywhere. For a start, you can drop those
parameters.

About the problem you encounter. Since GRASS does not support python3
(AFAIK), Itzï is only tested with python 2.7. It is strange that it
installed with python3. To force the installation with python2, you
can run the following command:
$ pip2 install itzi --user

Hope this will solve your problem.

Regards,
Laurent

2016-10-11 11:18 GMT-05:00 Rich Shepard <rshepard at appl-ecosys.com>:
> On Mon, 10 Oct 2016, Laurent C. wrote:
>
>> Note that Itzï does not need an output to run. If you set a simulation
>> with only the DEM, an uniform friction coefficient and an uniform
>> rainfall, the water will simply accumulate in the depressions, giving you
>> an insight of the flow patterns.
>
>
> Laurent,
>
>   I tried to run Itzi after defining variables as:
>         rain=0.01 # assuming this is the rate in mm/hr
>         n=0.05
>         bctype=4
>         bcvalue=0
> and this parameter file:
>
> [time]
> duration = 24:00:00
> record_step = 01:00:00
>
> [input]
> dem = be_cropped
> friction = n
> rain = rain
> bctype = bctype
> bcval = bcvalue
>
> [output]
> prefix = pop
> values = h, wse, v, vdir, boundaries
>
> [statistics]
> stats_file = pop.csv
>
>   Two issues:
>
>   First, Itzi is installed in Python-3.5's site-packages/ directory and I
> want to install it also Python-2.7.5's site-packages/ directory, too, and
> use that version since it seems that grass is using Python2. How do I
> specify to Itzi to install in /usr/lib/Python-2.7.5/site-packages/?
>
>   Second, /usr/lib/Python-3.5/site-packages/itzi/configreader.py exists, yet
> I get this python error trace back from the attempted run:
>
>> itzi run itzi-param.txt
>
> Traceback (most recent call last):
>   File "/usr/bin/itzi", line 9, in <module>
>     load_entry_point('itzi==16.8', 'console_scripts', 'itzi')()
>   File "/usr/lib/python3.5/site-packages/itzi/itzi.py", line 40, in main
>     args.func(args)
>   File "/usr/lib/python3.5/site-packages/itzi/itzi.py", line 54, in itzi_run
>     from configreader import ConfigReader
> ImportError: No module named 'configreader'
>
>   I've not examined the source code; I can fix this error here but am I the
> only one to run into this?
>
> Thanks,
>
>
> Rich
>
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