[GRASS-user] r.watershed

[Marco Alicera]

How did you add culverts?!
Such a great question and I also wonder how you did. Short ago I knew about
Itzï and its ability to do it with SWMM
http://itzi.readthedocs.io/en/latest/tutorial.html#culvert-modelling.
Looking forward to testing it
--
Marco

2017-12-06 9:24 GMT+01:00 Shane Carey <careyshan at gmail.com>:

> Hi Mark,
>
> Thanks for your reply! Sounds great.
> How did you add culverts or other artificial flow control features to
> achieve water flowing through roads?
>
> I have a rivers layer and I compared it the streams I've obtained from
> r.watershed and r.watershed appears to not match these streams (which were
> accurately digitised) and I was wondering if I had a better resolution DTM
> would it solve this problem?
>
> Also, why is sink filling needed for terraflow and not watershed?
>
> Thanks for your help :-)
>
> On Máirt 5 Noll 2017 at 23:43, Mark Seibel <mseibel at gmail.com> wrote:
>
>> Hi Shane.
>>
>> I'm happy to report that I've modeled overland water flow with
>> r.watershed for over a quarter million acres, consisting of several large
>> project sites, at 1 meter DEM resolution. The data source was LiDAR
>> points to make the DEMs.
>>
>> At this resolution, it becomes necessary to add culverts, or other
>> artificial flow control features, to achieve water flowing through a road.
>> Otherwise, water is routed along roads until a lowest point is reached for
>> crossing.
>>
>> I also use r.terraflow outputs as ancillary data to help drop in culvert
>> locations and help provide guidance in problem areas.
>>
>> My geographic area is central Florida, which is very flat and full of
>> topographic depressions known as wetlands. These depressions interrupt the
>> stream network continuity in reality, but r.watershed does a fantastic job
>> making a continuous drainage network model, especially in these difficult
>> areas.
>>
>> Happy Modeling!
>>
>> Mark
>>
>> On Tue, Dec 5, 2017, 3:49 PM Shane Carey <careyshan at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I am trying to extract river network from a 5m DEM with some success
>>> using r.watershed. Has anyone tested this algorithm on high resolution
>>> LiDAR data for example - 1meter DTM and what kind of results have they
>>> obtained?
>>>
>>> Thanks
>>>
>>> --
>>> Le gach dea ghui,
>>> *Shane Carey*
>>> *GIS and Data Solutions Consultant*
>>>
>> _______________________________________________
>>> grass-user mailing list
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>>
>> --
> Le gach dea ghui,
> *Shane Carey*
> *GIS and Data Solutions Consultant*
>
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