r.water.outlet

GRASS GRASS user
1

Hello!

  Does anybody succeeded to run r.water.outlet? I don't know
why but I can't run this command.

Best regards

Piotr Labuda

2

Piotr

I also had this problem - the manual and help give the wrong format for
import - I ended up using another program called r.upbasin.downpath from
the anonymous ftp site in the /incoming directory at

            landfill.rutgers.edu

- note you have to install the WRAT programs in src.contrib/NMSU to use
this. Hope this helps

------------------------------------------------------------------------I

Richard Beecham email:beecham@aerg.canberra.edu.au
Hydrology Unit phone:(02) 895 7169
NSW Department of Water Resources fax :(02) 895 7834
Parramatta NSW 2124
Australia

On Sun, 22 May 1994, Piotr Labuda wrote:

Hello!

  Does anybody succeeded to run r.water.outlet? I don't know
why but I can't run this command.

Best regards

Piotr Labuda

3

Hello.
I think I had the same problem.
I was running r.water.outlet and getting a plain raster.
I found out that you must choose your point exactly on a stream generated
by r.watershed.
Doing so solve my problem.
--
View this message in context: http://osgeo-org.1803224.n2.nabble.com/r-water-outlet-tp1865650p5774891.html
Sent from the Grass - Users mailing list archive at Nabble.com.

4

On Thu, 25 Nov 2010, skualos wrote:

I think I had the same problem. I was running r.water.outlet and getting a
plain raster. I found out that you must choose your point exactly on a
stream generated by r.watershed. Doing so solve my problem.

   I think many of us learned this lesson the hard way. :frowning: I found that I
needed to greatly enlarge the raster to place the outlet exactly on the
stream.

Rich

5

Going through my pile of old emails.... Here goes a delayed answer

To delineate basins the water outlet must by on top of a lino of high
acumulation (river) as is explained in the Notes section in
r.water.outlet manual [1]. A trick I saw being used was to user
r.distance (or v.distance) prior to r.water.outlet. I had a map with
the outlet of 100 basin but they were not in the right place. So I
used r.distance to find the nearest river cell close to each outlet
and then use r.water.outlet. For those comming from ESRI backgound,
this is the equivalent of the "snap pour point command".

Cheers
Daniel

[1] - http://grass.osgeo.org/gdp/html_grass64/r.water.outlet.html

On Thu, Nov 25, 2010 at 3:12 PM, Rich Shepard <rshepard@appl-ecosys.com> wrote:

On Thu, 25 Nov 2010, skualos wrote:

I think I had the same problem. I was running r.water.outlet and getting a
plain raster. I found out that you must choose your point exactly on a
stream generated by r.watershed. Doing so solve my problem.

I think many of us learned this lesson the hard way. :frowning: I found that I
needed to greatly enlarge the raster to place the outlet exactly on the
stream.

Rich
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6

On Thu, 2 Dec 2010, Daniel Victoria wrote:

To delineate basins the water outlet must by on top of a lino of high
acumulation (river) as is explained in the Notes section in r.water.outlet
manual [1]. A trick I saw being used was to user r.distance (or
v.distance) prior to r.water.outlet. I had a map with the outlet of 100
basin but they were not in the right place. So I used r.distance to find
the nearest river cell close to each outlet and then use r.water.outlet.
For those comming from ESRI backgound, this is the equivalent of the "snap
pour point command".

Daniel,

   I have an upcoming project where using r.distance to find the appropriate
cell for r.water.outlet may be quite useful.

Thanks,

Rich