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United States Department of Agriculture

Agricultural Research Service

Title: Evaluation of the Annagnps Water Quality Model

Authors
item Bosch, David
item Theurer, R. - NRCS
item Bingner, Ronald
item Felton, G - UNIVERSITY OF MARYLAND
item Chaubey, J - UNIVERSITY OF ARKNANSAS

Submitted to: Southern Cooperative Series Bulletin
Publication Type: Experiment Station
Publication Acceptance Date: August 3, 2001
Publication Date: August 3, 2001
Citation: BOSCH, D.D., THEURER, R., BINGNER, R.L., FELTON, G., CHAUBEY, J. EVALUATION OF THE ANNAGNPS WATER QUALITY MODEL. Southern Cooperative Series Bulleetin 398, 200pp. http://www3.bae.ncsu.edu/Regional-Bulletins/Modeling-Bulletin.pdf. 2001.

Interpretive Summary: Assessment projects characterizing the quality of water flowing from watersheds are extremely costly and time consuming. The ability to efficiently and reliably predict the quality of this water using a numerical representation of the processes is very desirable. This can reduce costs and allow the examination of multiple solutions to the water quality problem. This paper evaluates the Annualized Agricultural Non- Point Source model, AnnAGNPS. AnnAGNPS is a continuous-simulation, multi-event model that can be used to predict non-point source pollutant loadings from agricultural watersheds. It is a tool for comparing the effects of implementing various conservation alternatives within the watershed. AnnAGNPS was released to the public in February of 1998 and has undergone limited testing. Considerable more testing must be done before AnnAGNPS can be judged as reliable and accurate. Due to the extensive input requirements, additional tools need to be developed to ease the burden of developing input data sets for the model. Information provided in this review will be beneficial to citizens, managers, and scientists interested in watershed management for improved water quality.

Technical Abstract: This paper describes the capabilities of the Annualized Agricultural Non- Point Source model, AnnAGNPS. This evaluation discusses model capabilities, appropriate applications, sensitivity, testing, and availability. AnnAGNPS is a continuous-simulation, multi-event modification of AGNPS with improved technology and the addition of new features. The model can be used to predict non-point source pollutant loadings from agricultural watersheds. It is a tool for comparing the effects of implementing various conservation alternatives within the watershed. Cropping systems, fertilizer application rates, water and dissolved nutrients from point sources, sediment with attached chemicals from gullies, soluble nutrient contributions from feedlots, and the effect of terraced fields can be modeled. Version 1 of AnnAGNPS was released in February 1998. It includes all the features that were in the original AGNPS plus pesticides, source accounting, settling of sediments due to in-stream impoundments, and the Revised Universal Soil Loss Equation. At this time, the model has undergone limited testing. An upgrade that will include snow-melt and frozen soil components is expected in 1998.

Last Modified: 10/24/2014
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