Watershed delineation and NHD flowline

[Chang Liao]

I doubt that I am the only one get this question. After the watershed delineation using DEM or auxiliary data, the stream/basin can NOT match with the NHD flowline datasets.

Especially when lake comes into play, how could we reserve lake as one HRU?

I was trying to use the pre-defined stream and watershed, but didn't work quite well as the stream network could be very complex.

[Jim Almendinger]

I'm not exactly sure what you are asking.  If you want NHD flowlines to match those used in SWAT, then you can of course "burn in" that flow-line data set before the watershed delineation step.  And if you want subbasins to terminate at the outlet of a lake, then you can add an outlet at that point in ArcSWAT (and if you want subbasins of inlet streams to terminate where they enter the lake boundary, add outlets at those points also). 

Lakes are usually modeled as reservoirs in SWAT, not as individual HRUs.  Small areas of WATR land cover are aggregated into a water HRU but these do not contribute to the loads from the subbasin, if I recall.  If there is enough area of WATR in the subbasin to affect loads, then they should be modeled as a pond or wetland feature in that subbasin.

-- Jim

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From: "Chang Liao" <changlia...@gmail.com>
To: swat...@googlegroups.com
Sent: Tuesday, September 2, 2014 8:59:06 PM
Subject: [SWAT-user:4971] Watershed delineation and NHD flowline

I doubt that I am the only one get this question. After the watershed delineation using DEM or auxiliary data, the stream/basin can NOT match with the NHD flowline datasets.

Especially when lake comes into play, how could we reserve lake as one HRU?

I was trying to use the pre-defined stream and watershed, but didn't work quite well as the stream network could be very complex.

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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