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Model Report


Last Revision Date: 02/22/2011 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:
PLOAD is an ARCVIEW GIS tool to calculate non-point sources of pollution in watershed and stormwater projects

PLOAD is a simple GIS-based watershed loading model that can be used to estimate combined point and non-point source loads in either small urban areas or in rural watersheds of any size. PLOAD estimates total annual pollutant loads from watersheds, and is neither a continuous simulation, a steady state model, nor a receiving waterbody model. Pollutants most commonly analyzed with this tool are sediments (TSS and TDS), oxygen demand (BOD and COD), nutrients (nitrogen, nitrate plus nitrite, TKN, ammonia, phosphorous), metals (lead, zinc) and bacteria (fecal coliform), or any other user-specified pollutant.

Model Technical Contact Information:
Lisa Larimer
U.S. Environmental Protection Agency
Office of Water, Office of Science and Technology
Model Homepage: http://www.epa.gov/waterscience/basins/

User Information Back to Top
Technical Requirements
Computer Hardware
Requirements (to run BASINS) are 200MHz or higher Pentium, with a minimum of 300MB of disk space
Compatible Operating Systems
Microsoft Windows 95, 98, 2000, XP
Other Software Required to Run the Model
PLOAD is distributed as part of BASINS.
Download Information
The model is publicly available from the U.S. EPA, Office of Water (OW), Office of Science and Technology (OST):
Using the Model
Basic Model Inputs
Land use distribution within a watershed, and either export coefficients or Event Mean Concentrations for each land use.
Basic Model Outputs
Annual pollutant export loads from watersheds
User Support
User's Guide Available?

Model Science Back to Top
Summary of Model Structure and Methods
The model uses flexible (user-defined) units.

Governing equations are solved analytically with solutions available in closed form.

Model Evaluation
Moderate model testing (evaluation) has been performed.

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