Also known as
Model type Modular
Model part of larger framework
Note on status model
Date note status model
Spatial dimensions
Spatial extent
Model domain Hydrology, Terrestrial
One-line model description Process-based soil erosion by water at field/farm scale
Extended model description The Water Erosion Prediction Project (WEPP) model is a process-based, distributed parameter, continuous simulation erosion prediction model for application to hillslope profiles and small watersheds. Interfaces to WEPP allow its application as a stand-alone Windows program, a GIS-system (ArcView, ArcGIS) extension, or in web-based links. WEPP has been developed since 1985 by the U.S. Department of Agriculture for use on croplands, forestlands, rangelands, and other land use types.

basin, water erosion,

Name Dennis Flanagan
Type of contact Project manager
Institute / Organization USDA-Agricultural Research Service
Postal address 1 National Soil Erosion Research Laboratory
Postal address 2 275 S. Russell Street
Town / City West Lafayette
Postal code 47907-2077
State Indiana
Country United States
Email address
Phone 765-494-7748
Fax 765-494-5948

Name Jim Frankenberger
Type of contact Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
Email address

Supported platforms
Unix, Linux, Windows
Other platform
Programming language

Fortran77, Fortran90

Other program language
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 1985
Does model development still take place? Yes
If above answer is no, provide end year model development
Code development status
When did you indicate the 'code development status'?
Model availability As code, As teaching tool
Source code availability
(Or provide future intension)
Source web address
Source csdms web address
Program license type Other
Program license type other --
Memory requirements --
Typical run time <1 minute for hillslope simulations

Describe input parameters Daily climate input (temperatures, precipitation depth, duration, Tp, Ip, wind info); slope input (distance downslope, slope at points, profile width, aspect); soil input (infiltration & erodibility parameters, soil layer depth, texture, organic matter, CEC, etc.; cropping/management input - plant growth parameters, residue decomposition parameters, tillage operation parameters, residue management parameters, dates of operations (planting, harvest, tillage, residue management, etc.); irrigation input - type of irrigation, date(s) of irrigation, application rates, etc.; channel parameters input - channel shape, width, slope, roughness, etc.; impoundment parameters input - type of impoundment (1. Drop Spillway 2. Perforated Riser 3. Culvert 4. Emergency Spillway or Open Channel 5. Rock Fill Check Dam 6. Filter Fence / Straw Bales / Trash Barriers 7. User Specified Stage-Discharge Relationship, parameter inputs specific to each impoundment type; watershed structure file - describes how all hillslopes, channels, and impoundments in a watershed are linked.
Input format ASCII
Other input format
Describe output parameters Storm, monthly, yearly, or average annual runoff, soil loss, and sediment yield from a hillslope profile. Spatial distribution of soil erosion and deposition on slope profiles. Graphical output available of 92 parameters from continuous model simulations (including precip, temperatures, runoff, soil loss, sediment yield, biomass production, residue cover, etc.). Soil output text file, water balance output text file, plant output text file, storm event output file, overland flow element summary line output file.
Output format ASCII
Other output format
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software
Visualization software needed? No
If above answer is yes
Other visualization software

Describe processes represented by the model Climate generation (CLIGEN), infiltration, percolation, evapotranspiration, plant growth, residue management and decomposition, runoff, hydralics of overland flow, soil detachment by raindrop impact and shallow flow (interrill), soil detachment by excess flow shear stress (rill, channel), sediment transport, sediment deposition, irrigation, winter processes (snow melt, frost, thaw), channel erosion processes, sedimentation in impoundments.
Describe key physical parameters and equations Rain storm depth, storm duration, storm intensity - driving variables; effective hydraulic conductivity - controls infiltration into soil; baseline soil erodibility parameters (interrill erodibility, rill erodibility, critical hydraulic shear stress) - control soil detachment rates; slope inputs - control amount of flow shear stress and sediment transport capacity available to detach and tranport soil/sediment; plant growth parameters - control the production of biomass that protects soil surface; residue decomposition parameters - control the rate of residue loss from soil surface; tillage operation parameters - control the amount of soil disturbance and burial of residue - both of which impact the adjusted erodiblities for a given day.
Describe length scale and resolution constraints Hillslope simulations are recommended for lengths not greatly exceeding 100 meters. Watershed simulations should not exceed areas above 260 hectares. Larger areas can be simulated for hillslope spatial analyses only - but the channel processes will not be accurate at these larger scales.
Describe time scale and resolution constraints The model can be run for a single storm (minutes to hours), and can also be run in continuous simulation mode for any number of years (1 - 100+).
Describe any numerical limitations and issues

Describe available calibration data sets Data available from 1986-88 field experimentation (in compendium) using rainfall simulation. Also, validation data sets are available from USLE database.
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available:
Describe ideal data for testing Ideal data would consist of breakpoint (recording raingage) rainfall data, observed temperatures, radiation, wind, plant cover, residue cover, storm runoff, storm sediment loss, etc.

Do you have current or future plans for collaborating with other researchers? Yes
Is there a manual available? Yes
Upload manual if available:
Model website if any
Model forum / discussion board
Comments --

This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No but possible
PyMT component
Is this a data component
Can be coupled with:
Model info
Dennis Flanagan
Nr. of publications: --
Total citations: 0
h-index: --"--" is not a number.
m-quotient: 0
Qrcode WEPP.png
Link to this page

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Nr. of publications: --
Total citations: 0
h-index: --"--" is not a number.
m-quotient: 0

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Input Files

Output Files