SWAT for Reservoirs

[Alwish Ranjith]

If i have a reservoir with a very large water spread area and when i digitize the streams from the toposheet i get streams + a very large water spread area for the reservoir. Now , what shall i do ? because the streams are disconnected between the sluice of the reservoir and the start of the reservoirs water spread area. Should I create an imaginary stream just to connect it.

[Jim Almendinger]

Check the ArcSWAT and SWAT user-group archives for this -- I know I've written responses to this before.  ArcSWAT will already create the necessary stream connections, some of which will appear "imaginary" since they occur "inside" the reservoir.  SWAT treats these as actual reaches, which is a little unrealistic but it seems to be so minor that it doesn't cause (many) problems.  The reservoir is considered as a separate entity, at the outlet of the reach of the subbasin in which the reservoir occurs. 

   Briefly, what I do when the reservoir is large is to add outlets manually (or by table) where tributaries enter the reservoir, and then delete the outlets that lie within the reservoir.  Check the user-group archives for more details (which I hope are still there). 

Best of luck,

-- Jim

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From: "Alwish Ranjith" <alwish...@gmail.com>
To: "QSWAT" <qs...@googlegroups.com>
Sent: Friday, January 8, 2016 9:54:56 PM
Subject: SWAT for Reservoirs

If i have a reservoir with a very large water spread area and when i digitize the streams from the toposheet i get streams + a very large water spread area for the reservoir. Now , what shall i do ? because the streams are disconnected between the sluice of the reservoir and the start of the reservoirs water spread area. Should I create an imaginary stream just to connect it.

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--

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

[Ram Brahmam]

I had a question regarding the entry of reservoir data. in my subbasin more reservoirs were there so while selecting the subbasin number it's mismatching with reservoir ID. can you help me in this. here am attaching the screenshots of the same.

On Monday, January 11, 2016 at 8:59:50 AM UTC+5:30, jalmendinger wrote:

Check the ArcSWAT and SWAT user-group archives for this -- I know I've written responses to this before.  ArcSWAT will already create the necessary stream connections, some of which will appear "imaginary" since they occur "inside" the reservoir.  SWAT treats these as actual reaches, which is a little unrealistic but it seems to be so minor that it doesn't cause (many) problems.  The reservoir is considered as a separate entity, at the outlet of the reach of the subbasin in which the reservoir occurs. 

   Briefly, what I do when the reservoir is large is to add outlets manually (or by table) where tributaries enter the reservoir, and then delete the outlets that lie within the reservoir.  Check the user-group archives for more details (which I hope are still there). 

Best of luck,

-- Jim

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From: "Alwish Ranjith" <alwish...@gmail.com>
To: "QSWAT" <qs...@googlegroups.com>
Sent: Friday, January 8, 2016 9:54:56 PM
Subject: SWAT for Reservoirs

If i have a reservoir with a very large water spread area and when i digitize the streams from the toposheet i get streams + a very large water spread area for the reservoir. Now , what shall i do ? because the streams are disconnected between the sluice of the reservoir and the start of the reservoirs water spread area. Should I create an imaginary stream just to connect it.

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[Filipe Pinhati]

Dear Jim Almendinger,

I have previously successfully created various reservoir in ArcSwat and as you said, 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).

However, in QSwat is not shown any outlet 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. 

I hope you can help me again.

Thank you

Filipe Pinhati (Phil)