Point sources per subwatershed

[Adam Freihoefer]

Greetings,

From what I can tell it appears you can only have one point source per subwatershed (in SWAT2012). Is that correct? While the ArcSWAT interface allows the user to several, when the textinout file is created it appears there is only one point source. We would like to have several point sources per subwatershed and have each of them be a separate file. I am curious if this is possible before I dig into any further.

Kind Regards,

Adam Freihoefer

Wisconsin Dept. of Natural Resources

[Jim Almendinger]

Adam --

I don't know for sure, but I'll bet only one is allowed per subbasin.  To allow multiple point sources, they'd need a second subscript in the code to identify them.  I'll bet that additional complexity wasn't built into the code for a situation that doesn't happen all that frequently (if your model area and subbasins are small enough, that is).  I've avoided the issue by combining point sources into a single pseudo-source for the few times it's happened in my models. 

-- Jim

---

From: "Adam Freihoefer" <adamfre...@yahoo.com>
To: arc...@googlegroups.com
Sent: Thursday, December 19, 2013 1:11:15 PM
Subject: [ArcSWAT:5938] Point sources per subwatershed

--
You received this message because you are subscribed to the Google Groups "ArcSWAT" group.
To unsubscribe from this group and stop receiving emails from it, send an email to arcswat+u...@googlegroups.com.
To post to this group, send email to arc...@googlegroups.com.
Visit this group at http://groups.google.com/group/arcswat.
For more options, visit https://groups.google.com/groups/opt_out.

---

Spam
Not spam
Forget previous vote

--

Dr. James E. Almendinger
St. Croix Watershed Research Station
Science Museum of Minnesota
16910 152nd St N
Marine on St. Croix, MN  55047
tel: 651-433-5953 ext 19

[Adam Freihoefer]

Thanks Jim and others who responded to me. I suspected that each subwatershed was limited to one point source, but it is nice to know there is not a way to cheat the system without major effort. We are trying to bring in our WinSLAMM urban simulated loads into SWAT and we wanted to be able to keep it separate from the municipal and industrial effluent point sources. I think we will just manage it in a database outside of SWAT and lump into a single pseudo-source as you mentioned.

Thanks again for the quick response.

Cheers,

Adam

[Naresh Pai]

Hi Adam,

In the past, when I wanted to isolate the effects of WWTPs from others, I kept two copies of the point source files for a subbasin. One with and without WWTP inputs (there were other minor points sources in the subbasin). You might want to keep three copies of point sources for each subbasin (municipal, industrial, municipal + industrial) to look at how they impact the water quality at watershed outlet.

Naresh

[sssun...@gmail.com]

Hello,

 

I am having an issue where ArcSWAT converts to only one point source for the whole watershed; I manually add 15 point sources throughout the watershed, in different subwatersheds, and when I calculate the subbasin parameters, ArcSWAT eliminates 14 of my point sources, and keeps only the one furthest downstream. Am I forgetting to check a box somewhere? Any guidance is appreciated.

 

Thanks,

 

Stacey

[Adam Freihoefer]

I haven't tested this issue as of yet (I can when I am back in the office). My only recommendation would be to try to add the point sources as a tabular input (rather than spatially defining them through the ArcSWAT interface). In the coming days I will let you know if I am able to recreate your observation within one of my project watersheds. 

Regards,

Adam Freihoefer

Wisconsin Department of Natural Resources

[sssun...@gmail.com]

I actually haven't had any luck getting the tabular option to activate (its greyed out). Since I have only the 15 points, I wasn't worried about that particular issue.

[Naresh Pai]

When delineating a the watershed, did you check the box in AWD window which adds a dummy point source to every subbasin? Since the spatial location of point source is not considered by SWAT (all point sources are assumed to be at the inlet of the subbasin), checking this box sounds like a good option.

Thanks,

Naresh

[sssun...@gmail.com]

Naresh,

 

Do you mean the "add point source to each subbasin" box that is under the outlet/inlet definition tab? I check this box and the "point source inlet", but the other two above this ("subbasin outlet" and "inlet draining watershed") are greyed out and the folder option to navigate to a file for adding the point sources by a table is also greyed out. It does not make a difference whether I check this box or not. I have tried both ways. Is there a different box you are referring to?

 

Thank-you,

 

Stacey Garrison

[Adam Freihoefer]

Stacey,

I set-up a test watershed today using ArcSWAT (Version 2012.10.1.10) (Version compatible with ArcGIS 10.1). I was able to get the point sources set using either the manual placement via editing or checking the box "Add point source to each subbasin" within the Outlet and Inlet Definition box. As Naresh suggests selecting the "Add point source to each subbasin" creates a dummy point source to each of your model's subbasins (see attached image). After you finish the rest of your model setup (HRU creation, writing input files, rewriting SWAT files), you will see a point source for each subbasin in your project database and your txtinout folder.

Cheers,

Adam Freihoefer

Wisconsin Department of Natural Resources

[Haddush Gidey]

Dear Adam,

I agree with your idea about point source number.

However I am faced a serious problem with inlet discharge situation...,

Dear SAWT users,

Currently I am dealing with SWAT modelling in a particular river basin, my study area is part of big river basin called  AWASH River Basin In Ethiopia. According to the Arc SWAT documentation 2009, I have fixed a sub basin inlet point so as to consider the incoming discharge from the upstream part of the basin to my study area. After completing the watershed delineation and writing all input tables, I have edited the input table for inlet discharge as a daily record dbf format data.

The model runs success fully, However while assessing the preliminary flow results at each reaches, and the main channel  I realized that, the inlet discharge edited as daily recorded dbf format is not either considered in the simulation or there is some thing which I did not understand about the situation.

There fore, I need your kind support about inlet discharge editing and its routing in the main channel.

Thanks!   

Show trimmed content

[hamish.p...@googlemail.com]

I'm having the same problem as Haddush - the Point Source Discharges that I add have no effect at all on the output stats.

My ArcSWAT model runs successfully with no error messages. I have gone on to add Point Source Discharges to my subwatersheds through Watershed Delineator, updating the tables along the way, and have got through this process with no error messages and the model still runs successfully.

 

However, no matter what I set the point discharge water flows to, they have no effect on the output (water yields etc). It seems that ArcSWAT is successfully reading in the point discharge data I'm giving it (.dat files are created for the inputs and the fig.fig is updated), but does nothing with these data.

 

Does anyone have any suggestions?

Many thanks!

Hamish

(I’m using ArcMap 10.1 build 3143 and ArcSWAT version 2012.10_1.18 released 9/9/15).