adding a reservoir.

[Shrestha]

I am starting to do put reservoir in my watershed. There are 7 reservoirs in my watershed.
Can you please say me how to put reservoir location in watershed with an good example?
Do we have to make reservoir boundary ?

[Jim Almendinger]

-- you can place the reservoirs manually in the proper subbasin during the watershed delineation process when building the model

-- you do not have to input the reservoir boundary.  All SWAT really cares about is the area and volume.  SWAT presumes the reservoir is at the outlet of the subbasin.  Hopefully, your subbasin has an area of land use (and "soil") corresponding approximately to the area of the reservoir.  These areas of WATR land use do not contribute runoff or loads from the subbasin.  They are then replaced with an equivalent area of reservoir, where water balance is tracked explicitly (precipitation, evaporation, flow in, flow out, seepage out).

-- in the simplest case, the reservoir is entirely within a single subbasin.  If there are 2 or more tributaries and the reservoir spans more than one subbasin (where its tributary reaches are joined somewhere "inside" the reservoir), things get a little more complicated.  I think most people attach the reservoir to the lowest subbasin and hope there are no obvious big errors.  A better solution is to move the tributary outlets to the reservoir boundary manually (delete the ones inside the reservoir and add new ones where the tributary enters the reservoir).  

-- Jim

Dr. James E. Almendinger, Senior Scientist
St. Croix Watershed Research Station
Science Museum of Minnesota
16910  152nd St. N
Marine on St. Croix, MN  55047
tel: 651-433-5953 X 19
fax: 651-433-5924
email: din...@smm.org
web: www.smm.org/SCWRS/

[Liem, Nguyen Duy]

Dear Shrestha,

You can read my following post with the very clearly answer of Jim:

https://groups.google.com/forum/#!topic/swatuser/fefS5zCm3K0

I hope you succeed!

Liem

2014/1/17 Jim Almendinger <jalmen...@smm.org>

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Nguyễn Duy Liêm

Bộ môn Tài nguyên & GIS,

Khoa Môi trường & Tài nguyên,

Trường Đại học Nông Lâm TP. HCM.
Địa chỉ: phường Linh Trung, quận Thủ Đức, Tp. HCM, Việt Nam

Website:  http://gis.hcmuaf.edu.vn/ 
Email: nguyen...@gmail.com

          nguyen...@yahoo.com

Mobile: (+84) 0983-613-551

Nguyen Duy Liem

Department of Natural Resources and GIS, 

Faculty of Environment and Natural Resources

Nong Lam University- Ho Chi Minh City.
Address: Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.

Website:  http://gis.hcmuaf.edu.vn/  
Email: nguyen...@gmail.com

          nguyen...@yahoo.com

Mobile: (+84) 0983-613-551

[jeewan...@gmail.com]

Hi, 

I added three reservoir locations when I do the catchment delineation. Two reservoirs have only one sub-basin each, but another one has 8 sub-basins in its upstream. This reservoir is located in main stream, and its not like Nguyen's case. 

I found that reservoir inflow is not the same as runoff in the main reach, it is just outflow of the particular sub-basin. I understood that to calculate the climate over the reservoir, we need one sub-basin (RES_SUB). Therefore, I'm wondering how I can incorporate correct reservoir inflow in SWAT model. 

The reservoir location and upstream catchment area is shown in attached figure. 

Thanks. 

Best Regards, 

Jeewa

[Jim Almendinger]

I am unsure what you are asking, but to clarify they hydrology:

The inflow to the reservoir should be the same as the outflow from the reach of the subbasin in which the reservoir is located.  (I'm not sure how precipitation on the reservoir gets added, if it is a rainy day.)  The reach delivering flow to the reservoir includes all the flow from upstream subbasins, as well as any runoff, lateral flow, and groundwater generated in the subbasin of the reservoir.

-- Jim

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James E. Almendinger, PhD

Director, St. Croix Watershed Research Station

Tel: 651-433-5953 x 11

Email: jalmen...@smm.org

[jeewan...@gmail.com]

Hi Jim, 

I understood that inflow to the reservoir is same as the outflow from the reach of the sub-basin where reservoir is located. This is valid if the reservoir is located where only one basin drains to it. But my question is that if the reservoir is located in downstream where several up stream catchments are drains to the reservoir. 

As I mentioned in the previous post with figure, inflow to the reservoir should be flow comes through the reach (all upstream flow) not only the flow out from last basin where reservoir is located. In my case, it shows that reservoir inflow is equal to the flow out of last basin where reservoir is located. 

Could you please guide me on this regard. 

Thanks. 
Best Regards, 

Jeewa 

[Jim Almendinger]

As I pointed out, the inflow to the reservoir from the reach the reservoir is located in already includes flow from all reaches and subbasins above that reach.  It is not just from the subbasin the reservoir is in.  

If your reservoir is large enough so that it has more than one tributary, then you should add outlets where the tributaries enter the reservoir, and delete any spurious outlets from reach pseudo-confluences within the reservoir area.  

--Jim

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[jeewan...@gmail.com]

Hi Jim, 

I understood the procedure to follow up. 

Thanks a lot. 

Jeewa

[Laljeet Sangha]

Hello,

I want to do reservoir analysis based on the location. For this, I want to do the model setup and then shift its location on different stream orders for analysis. 

So is it possible to add the reservoir later after the model setup? 

Can the reservoir be turned on/off or deleted after the analysis is complete?

Thanks

[Sushant Mehan]

Dear Laljeet, 

I am not aware of any way so far to add the reservoir after the model set up as you need to define outlets during the process of delineation to understand the water balance of the reservoir. Turning on or off is something you need to play with reservoir parameters to meet your requirements, which can be done without GUI as well. I hope it will help.

I will appreciate if others can too share their insights on this!

Regards

Sushant 

[Laljeet Sangha]

Hello Sushant,

Thanks for the prompt reply. As you mentioned, I was just wondering if I populate the reservoir parameters in the access file (.res) and proceed from there would it have the same effect. As mentioned in this article,(https://groups.google.com/forum/#!searchin/arcswat/how$20to$20add$20ponds%7Csort:date/arcswat/RQhupfr1_VQ/4Fy32nbAEAAJ )  it works for ponds so would similar thing work for the reservoir as well. 

Thanks

Laljeet