Double-click to zoom in, and drag to pan. Hold down the shift key and drag to zoom to a particular region.
Zoom to Zip Code or City,State:
Example: Pullman,WA
Updates
- November 19, 2012 - The rock content in the WEPP soil files based on SSURGO soils was too low for some soil layers. Adjustments were made to sum all rock volume sizes from SSURGO.
- November 28, 2012 - The default climate generator has been set to version 5.3. The previous version, 4.3, can still be used by selecting it from Climate Processing Options section before WEPP is run.
- November 18, 2013 - The help PDF document was updated.
- November 21, 2013 - An Options tab was added to the main window. The latest WEPP model version 2012.8 was added as an option. Updated model run window.
- November 26, 2013 - Fixed bug when area of interest spanned DEM tiles. Added NLCD 2006 layer as a reference. Uses single NLCD 2001 raster instead of tiles.
Getting around the map
Double-click to zoom in, and drag to pan. Hold down the
shift key and drag to zoom to a particular region. Type in a city, state or a
zip code to go to a specific area.
The list of GIS layers is available by clicking the +
sign in the upper right of the map. To hide the list of layers click the -
(minus) sign above the layers.
Delineating Channels
The first step is to zoom to an area of interest and
click the Build Channel Network button.This will use the 30 meter DEM and the
TOPAZ model to build a channel network for the area. The maximum size of the
area that can be processed is about 0.2 degrees by 0.2 degreees.
Selecting an Outlet
After the channel network is complete click on a channel
which will be the outlet of your watershed.
Delineating a Watershed
Click the Build Subcatchments button to find the
watershed boundary based on the channel network and the outlet point selected.
This step will also define the subcatchment areas that will be used as WEPP
hillslope areas when making runs.
Review the Watershed
Click the Review Watershed button to finish getting the
soil and landuse information for the watershed. This will also open a web page
in a new window that shows the landuse and soil information for the watershed.
Make a WEPP Run
Finally, click this button to set the options for the
WEPP simulation.
Online WEPP Interface Documentation
View the PDF Documentation of how to use the online WEPP interface.
WEPP Online GIS (6.5mb PDF file) or the
SSURGO Data Availability
When the WEPP online GIS software delineates a watershed it requests soil data from the NRCS SSURGO database. Most of the United States is covered, this is the current map:
Web Soil Survey Coverage.
Where soil data is not available in a watershed a default soil is chosen.
How to download results to ArcGIS
View how to work with downloaded project data in ArcGIS.
How to view downloaded project in ArcGIS
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