Annual Agriculture Non-Point Source (AnnAGNPS)

Purpose:	Evaluate impacts to water quality (sediment and chemical loading) resulting from management decisions.
Developer:	United States Department of Agriculture
Key Features:	Spatial location of water quality hotspot
Latest Release:	2010X, Version 5.4
OS Platform:	Windows
Cost:	Free
Related Software:	SWAT
Website:	AnnAGNPS home page

Introduction

The AnnAGNPS pollution model, first released in 1989, is a suite of tools used to evaluate impacts of management decisions on water, sediment, and chemical loading in a watershed. AnnAGNPS is a distributed model – from a watershed geometry perspective, it discretize the watershed into a uniform grid. Daily runoff is calculated using the Soil Conservation Service runoff curve number and the RUSLE Revised Universal Soil Loss Equation calculates sheet and rill erosion. The RUSLE equation is defined at the cell level where each cell can have its own parameters, including farm operations. AnnAGNPS can be used to evaluate the long-term impacts of non-point source pollution from agricultural watersheds and to compare various management practices.

The AnnAGNPS model allows the user to track pollution sources at the grid scale level. The software has tools to track pollution from the source to the outlet.

Advantages and Limitations

Advantages	Limitations
Models erosion, nutrient, pesticide and management practices Event base or continuous simulations Identifies spatial locations with the highest pollution loading Integration with other USDA erosion models Analysis of flood impacts in real time Flexibility to use in Decision Support Systems	Point sources are constant loading All runoff and pollution loading is routed to watershed outlets before the next day simulation No tracking of nutrient and pesticide pollutants attached to sediment deposit from one day to another Thirty different categories of input data
Illustrative Screens

Sample Applications

Africa	East Asia and the Pacific	Europe & Central Asia	Latin America & the Caribbean	Middle East and North Africa	South Asia
Ethiopia (Validation Study)	China (Validation Study)		St Lucia (Sediment Yield)		Nepal (Evaluation Trial)