WEPP (Water Erosion Prediction Project) is a process-based, distributed parameter, continuous
simulation erosion prediction model. Work over the past several years has focused on development of
improved user interfaces and linkage of WEPP to Geographic Information Systems (GIS) that can allow rapid
and impartial delineation of watersheds and topographic features based upon digital elevation data. However,
many potential users of WEPP have little or no experience with commercial GIS packages, and that software
can also be quite expensive. This paper discusses a web-based WEPP-GIS system that only requires a user
to have a network connection and web browser. GIS Viewer software allows users to specify an area of
interest to model with WEPP, then digital elevation data for the area is sent to topographic parameterization
software to delineate watersheds, channels and hillslopes. The digital elevation data are processed on the
server side, and then images of the delineated watershed and hillslopes are passed to the user’s web-browser
window. Once the hillslopes and channels have been located, WEPP model simulations of representative
hillslope profiles and channels, and/or all flowpaths in the watershed, are conducted. The modeled soil erosion
results in graphical format are sent as images to the client computer. Subsequent model simulations using
different land management practices can help to show the impact of conservation practices on runoff and soil
erosion.
WEPP (Water Erosion Prediction Project) is a process-based, distributed parameter, continuoussimulation erosion prediction model. Work over the past several years has focused on development ofimproved user interfaces and linkage of WEPP to Geographic Information Systems (GIS) that can allow rapidand impartial delineation of watersheds and topographic features based upon digital elevation data. However,many potential users of WEPP have little or no experience with commercial GIS packages, and that softwarecan also be quite expensive. This paper discusses a web-based WEPP-GIS system that only requires a userto have a network connection and web browser. GIS Viewer software allows users to specify an area ofinterest to model with WEPP, then digital elevation data for the area is sent to topographic parameterizationsoftware to delineate watersheds, channels and hillslopes. The digital elevation data are processed on theserver side, and then images of the delineated watershed and hillslopes are passed to the user’s web-browserwindow. Once the hillslopes and channels have been located, WEPP model simulations of representativehillslope profiles and channels, and/or all flowpaths in the watershed, are conducted. The modeled soil erosionresults in graphical format are sent as images to the client computer. Subsequent model simulations usingdifferent land management practices can help to show the impact of conservation practices on runoff and soilerosion.
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