SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Modeling Phosphorus in the Lake Allatoona Watershed Using SWAT: I. Developing Phosphorus Parameter Values 
Authors:Radcliffe, D.E., Z. Lin, L.M. Risse, J.J. Romeis, and C.R. Jackson 
Journal:Journal of Environmental Quality 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:data/component contribution to SWAT 
Secondary Application Category:nutrient cycling/loss and transport 
Watershed Description:Upper Etowah, Shoal Creek, Little/Noonday, Owl/Kellogg, Acworth/Allatoona, and Stamp/Rowland subwatersheds of the 2,870 km^2 Lake Allatoona watershed in northern Georgia 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:Lake Allatoona is a large reservoir north of Atlanta, GA, that drains an area of about 2870 km^2 scheduled for a phosphorus (P) total maximum daily load (TMDL). Th e Soil and Water Assessment Tool (SWAT) model has been widely used for watershed-scale modeling of P, but there is little guidance on how to estimate P-related parameters, especially those related to in-stream P processes. In this paper, methods are demonstrated to individually estimate SWAT soil-related P parameters and to collectively estimate P parameters related to stream processes. Stream related parameters were obtained using the nutrient uptake length concept. In a manner similar to experiments conducted by stream ecologists, a small point source is simulated in a headwater sub-basin of the SWAT models, then the instream parameter values are adjusted collectively to get an uptake length of P similar to the values measured in the streams in the region. After adjusting the in-stream parameters, the P uptake length estimated in the simulations ranged from 53 to 149 km compared to uptake lengths measured by ecologists in the region of 11 to 85 km. Once the a priori P-related parameter set was developed, the SWAT models of main tributaries to Lake Allatoona were calibrated for daily transport. Models using SWAT P parameters derived from the methods in this paper outperformed models using default parameter values when predicting total P (TP) concentrations in streams during storm events and TP annual loads to Lake Allatoona.