How to Add Reservoir in QSWAT
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Rajveer
Aug 26, 2020, 2:46:43 AM8/26/20
to SWAT-user
Dear All,
Please suggest me how to add reservoir in QSWAT. I had reservoir in between two basin. I have tried using the Draw inlet outlet option in QSWAT but it didn't work.
Thanks in advance
Best Regards
Chris George
Aug 26, 2020, 7:21:26 AM8/26/20
to Rajveer, SWAT-user
If your reservoir is close to the junction of two subbasins, first do
the 'Create watershed' step without trying to mark the reservoir. Then
use the 'Select reservoir subbasins' button, and select the subbasin
upstream from the reservoir. When you then click 'Add' in the
delineation form the reservoir will be placed at the outlet of the subbasin.
Chris
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the 'Create watershed' step without trying to mark the reservoir. Then
use the 'Select reservoir subbasins' button, and select the subbasin
upstream from the reservoir. When you then click 'Add' in the
delineation form the reservoir will be placed at the outlet of the subbasin.
Chris
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Filipe Pinhati
Nov 28, 2022, 1:19:03 AM11/28/22
to SWAT-user
Dear Chris George,
In ArcSwat is know that when creating reservoirs you need to add outlets in every tributary entering the reservoir and then delete the outlets that lie within the reservoir (which I understand to be the points that ArcSwat creates on every junction between two reaches), as you can see the answer of Jim Almendinger to this question in this link (https://groups.google.com/g/qswat/c/DKc7rWrn63s/m/7Uen6cJxAQAJ).
However, in QSwat is not shown any outlets in the junctions between two reaches, so we can`t delete anything that lies within big reservoirs.
Considering that, I would like to ask you how how exactly is the way to set up reservoirs in QSwat.
That is, if I have a very big reservoir that intersect some 20 subbasins do I have to select all these 20 subbasins using the 'select reservoir subbasins buttom'? What do you think about creating outlets on the location where tributaries enter the reservoir prior to selecting subbasins?
Thank you
Phil
Chris George
Nov 28, 2022, 7:18:57 AM11/28/22
to Filipe Pinhati, SWAT-user
I am not a hydrologist so I don't think I can give an adequate answer to
your question.
In QSWAT outlets are implicitly placed at the ends of reaches, since
these points create subbasin boundaries. I don't know what is the
effect of deleting them in ArcSWAT. You can of course in QSWAT add
outlets where streams enter reservoirs.
You should perhaps look at QSWAT+ which has a way of dealing with large
lakes.
Chris
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your question.
In QSWAT outlets are implicitly placed at the ends of reaches, since
these points create subbasin boundaries. I don't know what is the
effect of deleting them in ArcSWAT. You can of course in QSWAT add
outlets where streams enter reservoirs.
You should perhaps look at QSWAT+ which has a way of dealing with large
lakes.
Chris
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Jim Almendinger
Nov 28, 2022, 8:13:37 AM11/28/22
to Chris George, Filipe Pinhati, SWAT-user
Phil has a good question, and it makes clear some of SWAT's shortcomings in dealing with reservoirs (large lakes in general) that have multiple tributaries. In ArcSWAT, (I hope) when a subbasin outlet is deleted, that subbasin's areas and attributes should be added to those of the next downstream outlet. If there were 5 tributaries, and new outlets were added where those tributaries enter the edge of the reservoir, and the >5 (10? two for each junction) former outlets inside the reservoir are eliminated and their subbasin attributes are added to the next downstream outlet (the reservoir outlet), then the subbasin for the reservoir outlet includes all the land that lies between the tributary outlets and contributes directly to the reservoir. At least, I hope this is what happens -- I never looked at the details. I also hope that the area covered by the reservoir is subtracted out from the land that actually contributes runoff to the reservoir. I also don't know what SWAT now considers the reach length and slope for the new reach of the combined subbasins.
This is very convenient, because it allows the user to extract output from a single subbasin to see the directly contributing components versus those delivered by tributaries. Otherwise, I'm afraid the user would have to add all the subbasin inputs from the inside-reservoir outlets to get their total. This can be done (I think), but it's not convenient. On the other hand, perhaps the reservoir output data table has done this calculation for you -- I can't remember.
I'll point out a final consideration, namely that the reaches that are within the reservoir (I call them pseudo-reaches) may have very low slopes, which may cause sediment to be deposited there. Because SWAT considers these reaches to be "upstream" of the reservoir, the SWAT calculated sediment deposition in the reservoir may be much underestimated. These reaches are really part of the reservoir and what gets deposited in them should be included as part of the overall reservoir sedimentation.
Cheers,
-- Jim
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Chris George
Nov 30, 2022, 8:51:42 AM11/30/22
to Filipe S C Pinhati, SWAT-user, Jim Almendinger
Hi Phil,
Further thoughts about QSWAT:
Since it shares the same editor and SWAT executable as ArcSWAT, it
should be possible to set up the model in the same way. I didn't know
what the effect was of removing confluence nodes in ArcSWAT, but from
the correspondence it seems this is the same as subbasin merge in QSWAT.
So it may be possible to set up models in the same way as ArcSWAT by
1. Adding outlets where streams cross the reservoir boundary.
2. Removing the implicit outlets within the reservoir boundary. To do
this you use the merge subbasins option in QSWAT, selecting the
subbasin(s) upstream from the confluence you need to remove. Merging
always merges the upstream subbasin with the one downstream, so
effectively removing the outlet point between them.
In this way you should be able to develop a model in which the reservoir
is entirely contained within one subbasin, provided your original stream
network only has one stream exiting the reservoir.
Chris
On 11/30/2022 6:04 AM, Filipe S C Pinhati wrote:
> Hi Jim and Chris, thanks for your consideration.
> Previously I have prepared and modelled small reservoirs with ArcSWAT
> 10.5 and in the process of setting up the model I eliminated all the
> nodes that fell within each reservoir, which conveniently gave me a
> single outlet at the mouth of each reservoir instead of various outlets
> inside each reservoir. By the way, I refer to nodes as the points that
> ArcSWAT 10.5 creates at the confluences between two reaches after
> running the creation of the stream network, before creating basins and
> the watershed.
>
> So, that worked well in ArcSWAT. However, I lost my license to work with
> ArcSWAT, so I tried to work with QSWAT on a new project. However,
> apparently such nodes on the confluences between two reaches are
> non-existent in QSWAT, so the same procedure used to create reservoirs
> in ArcSWAT can`t be employed in QSWAT. Alternatively, I tried to migrate
> to QSWAT+ and it was great to see that it was really easy to incorporate
> the reservoirs into the model just by adding the shapefiles as lakes
> (please find attached the shapefiles of the lakes, reaches and
> watersheds of my new project).
>
> Unfortunately, it seems that there is no documentation that one can
> refer to teach him/herself on how to set up reservoirs in QSWAT+. So, I
> kind of quit carrying out my project in QSWAT+, and this is why I was
> asking about how to set up reservoirs in QSWAT, because SWAT 2012 has a
> comprehensive written material about its reservoir module and all of its
> other modules.
>
> In conclusion, given that SWAT+ seems to bring significant advancements
> in the representation of reservoirs in comparison to SWAT 2012, can you
> please let me know where I can find a material teaching how to set up
> reservoirs in QSWAT+? That is, how to set up volume, surface area,
> outflow, evaporation, infiltration and other parameters for reservoirs?
>
> Many thanks.
>
> Phil
> <https://groups.google.com/g/qswat/c/DKc7rWrn63s/m/7Uen6cJxAQAJ>).
> <mailto:swatuser%2Bu...@googlegroups.com>
> > > <mailto:swatuser+u...@googlegroups.com
> <mailto:swatuser%2Bu...@googlegroups.com>>.
> > >
> >
> <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer> <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer>>>.
> > <mailto:swatuser+u...@googlegroups.com
> <mailto:swatuser%2Bunsu...@googlegroups.com>>.
>
Further thoughts about QSWAT:
Since it shares the same editor and SWAT executable as ArcSWAT, it
should be possible to set up the model in the same way. I didn't know
what the effect was of removing confluence nodes in ArcSWAT, but from
the correspondence it seems this is the same as subbasin merge in QSWAT.
So it may be possible to set up models in the same way as ArcSWAT by
1. Adding outlets where streams cross the reservoir boundary.
2. Removing the implicit outlets within the reservoir boundary. To do
this you use the merge subbasins option in QSWAT, selecting the
subbasin(s) upstream from the confluence you need to remove. Merging
always merges the upstream subbasin with the one downstream, so
effectively removing the outlet point between them.
In this way you should be able to develop a model in which the reservoir
is entirely contained within one subbasin, provided your original stream
network only has one stream exiting the reservoir.
Chris
On 11/30/2022 6:04 AM, Filipe S C Pinhati wrote:
> Hi Jim and Chris, thanks for your consideration.
> Previously I have prepared and modelled small reservoirs with ArcSWAT
> 10.5 and in the process of setting up the model I eliminated all the
> nodes that fell within each reservoir, which conveniently gave me a
> single outlet at the mouth of each reservoir instead of various outlets
> inside each reservoir. By the way, I refer to nodes as the points that
> ArcSWAT 10.5 creates at the confluences between two reaches after
> running the creation of the stream network, before creating basins and
> the watershed.
>
> So, that worked well in ArcSWAT. However, I lost my license to work with
> ArcSWAT, so I tried to work with QSWAT on a new project. However,
> apparently such nodes on the confluences between two reaches are
> non-existent in QSWAT, so the same procedure used to create reservoirs
> in ArcSWAT can`t be employed in QSWAT. Alternatively, I tried to migrate
> to QSWAT+ and it was great to see that it was really easy to incorporate
> the reservoirs into the model just by adding the shapefiles as lakes
> (please find attached the shapefiles of the lakes, reaches and
> watersheds of my new project).
>
> Unfortunately, it seems that there is no documentation that one can
> refer to teach him/herself on how to set up reservoirs in QSWAT+. So, I
> kind of quit carrying out my project in QSWAT+, and this is why I was
> asking about how to set up reservoirs in QSWAT, because SWAT 2012 has a
> comprehensive written material about its reservoir module and all of its
> other modules.
>
> In conclusion, given that SWAT+ seems to bring significant advancements
> in the representation of reservoirs in comparison to SWAT 2012, can you
> please let me know where I can find a material teaching how to set up
> reservoirs in QSWAT+? That is, how to set up volume, surface area,
> outflow, evaporation, infiltration and other parameters for reservoirs?
>
> Many thanks.
>
> Phil
> > > <mailto:swatuser+u...@googlegroups.com
> <mailto:swatuser%2Bu...@googlegroups.com>>.
> > > To view this discussion on the web visit
> > >
> >
> https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com> <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com>>
> > >
> >
> > >
> >
> <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer> <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer <https://groups.google.com/d/msgid/swatuser/6970b4c1-02fb-4204-81ce-84eda9b9cb96n%40googlegroups.com?utm_medium=email&utm_source=footer>>>.
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Natalja C.
Dec 1, 2022, 9:28:39 AM12/1/22
to SWAT-user
Hello all,
Yes, I can confirm that this is "the way to go". I would only advice in step 1 to add the outlets a bit upstream of the "actual" intersection. Depending on your DEM the delineation step might produce very strange results.
All the best,
Natalja
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