Determining pour point and watershed of a lake with no evident outlet?

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11-11-2015 12:40 PM
MickyAnders
New Contributor

Hi All, Wondering about determining watershed area of a small lake with no outlet.  How does one determine a pour point location to run the watershed tool?  I saw a prior response about changing the lake into a raster but that didn't seem to work.  I've completed the fill, flow direction, flow accumulation steps, yet the watershed doesn't look complete.  Thanks, Mick

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3 Replies
DanPatterson_Retired
MVP Emeritus

You have seen the information on snap pour point? Snap Pour Point—Help | ArcGIS for Desktop

LukeSturtevant
Occasional Contributor III

There is absolutely no outlet to the lake so this lake is a natural sink? Could you maybe post a picture of what your watershed looks like and where you are placing your pour point?

MichelleTotman
Occasional Contributor

Have you tried the "Batch Watershed Delineation for Polygons" tool in ArcHydro under Wadershed Processing? I used this tool to determine the watersheds contributing to wetland polygons and found that it worked pretty well.