shrug-l: proportion of watershed upstream of monitoring location

Kristal Walsh kwalsh at
Fri Sep 7 12:07:13 EDT 2007

Michael, there's a way to do it in ArcHydro but you have to have a DEM,
create flow direction and then use your sample sites as "pour points"
basically.  The tools run in sequence so if you don't get too bogged
down in the literature and just use your default settings, it shouldn't
take you tool long.  The flow accumulation grid will give you the area
at which the sample sites coincide and this is equal to your upslope
drainage area. I'm not a real experienced ArcHydro user so I'm sure
there are others out there that may give you some more specific advice.
Good luck. Kristal


Kristal Walsh, GIS Specialist

Baskerville-Donovan, Inc.

Pensacola, Florida

850-438-9662, 4354



From: Michael McManus [mailto:mmcmanus at TNC.ORG] 
Sent: Friday, September 07, 2007 7:27 AM
To: shrug-l at
Subject: shrug-l: proportion of watershed upstream of monitoring


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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