Convert between Water depth and Water level

1,219 views
Skip to first unread message

Liem, Nguyen Duy

unread,
Jul 13, 2015, 9:03:46 AM7/13/15
to arcswat, SWAT-user
Dear all, 

I am consider to how to convert between Water depth and Water level in SWAT model.
As I know, water depth can be found on output.dep file located in TxtInOut folder.
The values of water depth is elevation measured from water surface to riverbed? It is right or wrong?
Inline images 2

I would like convert from water depth to water level using the below equation:
Water level = Water depth + Riverbed elevation
It is right or wrong? If right, how I can find the value of riverbed elevation in SWAT?
Inline images 1

I am really grateful for any ideas/ comments from all of you!
Thank you for your reading!
Yours sincerely!
Liem

--


Nguyễn Duy Liêm
Bộ môn Tài nguyên & GIS,
Khoa Môi trường & Tài nguyên,
Trường Đại học Nông Lâm TP. HCM.
Địa chỉ: P. Linh Trung, Q. Thủ Đức, Tp. Hồ Chí Minh, Việt Nam

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.
          nguyen...@yahoo.com

Jim Almendinger

unread,
Jul 13, 2015, 9:41:05 AM7/13/15
to Liem, Nguyen Duy, ArcSWAT, SWAT-user
Liem --
I doubt I know more about this than you -- but I agree that SWAT output on water depth is almost certainly the depth to the river bed. 
As to the river bed elevation -- I don't know.  I presume SWAT knows the elevation at the beginning and end of a subbasin from the original DEM, but I don't know if this is considered to be the water elevation, or the river bed elevation.  I would guess it is the water elevation (because the DEM does not know the difference between land and water) -- and so river bed elevation would be the DEM elevation minus water depth at that point, on that day (which complicates the answer because water level changes daily).  I believe you will only get an approximate value for streambed elevation this way.  You may as well analyze the DEM outside of SWAT to get riverbed elevations at selected points (e.g., at subbasin outlets). 
Best,
-- Jim

From: "Liem, Nguyen Duy" <nguyen...@gmail.com>
To: "ArcSWAT" <arc...@googlegroups.com>, "SWAT-user" <swat...@googlegroups.com>
Sent: Monday, July 13, 2015 8:03:22 AM
Subject: [SWAT-user:5669] Convert between Water depth and Water level

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


--
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

image.png
image.png

R Srinivasan

unread,
Jul 13, 2015, 9:44:08 AM7/13/15
to Jim Almendinger, Liem, Nguyen Duy, ArcSWAT, SWAT-user
Jim, your first statement is correct. SWAT does not use or print true elevation of the river bottom to estimate depth or water develop. SWAT uses only hydrologic routing and not hydraulic routing. Only hydraulic routing would need/estimate water elevation, back water propagation, flooding depth/intensity/duration etc.


Liem, Nguyen Duy

unread,
Jul 13, 2015, 9:50:08 AM7/13/15
to R Srinivasan, Jim Almendinger, ArcSWAT, SWAT-user
Dear Jim, Srinivasan,

Thank you so much for your very valuable responses!

Liem
Reply all
Reply to author
Forward
0 new messages