shrug-l: proportion of watershed upstream of monitoring location

Donner, Barbara Barbara.Donner at
Fri Sep 7 11:05:37 EDT 2007

Hey Mike,
You will either need to manually delineate the part of the watershed that
drains into that location, or use Spatial Analyst and a DEM to have GIS
automatically do a delineation.  The manual method requires using the
contours of a topographic map which is (in my opinion) more accurate, but
also requires skill and experience.  With Spatial Analyst, a good DEM is
required, or you will get errors.  If you would like more information, please
contact me personally.
Barbara A. Donner
Environmental Specialist II
Watershed Assessment Section
Department of Environmental Protection
2600 Blair Stone Road, MS 3555
Tallahassee, Florida  32399-2400
(850) 245-8453, suncom:  205-8453


From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of Michael McManus
Sent: Friday, September 07, 2007 8:27 AM
To: shrug-l at
Subject: shrug-l: proportion of watershed upstream of monitoring location

I have a point shape file of monitoring locations on rivers.  I have a shape
file of the watershed polygons in which those monitoring stations are
located.  For a particular monitoring location, how do I calculate the
proportion of the watershed that is upstream from that location?
Michael McManus
Senior Aquatic Ecologist
The Nature Conservancy
625 N. Adams Street
Tallahassee FL 32301
850.222.0199 (office)
850.559.1530 (cell)
850.222.0973 (fax)
Courtesy Research Associate
Department of Biological Science
Florida State University
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