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 
Volume (Issue):38 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:data and/or component contribution to SWAT 
Secondary Application Category:phosphorus cycling/loss and transport 
Watershed Description:1618.9 km^ 2 Upper Etowah, 176.7 km^2 Shoal Creek, 572.9 km^2 Little/Noonday, 24.9 km^2 Owl/Kellogg, 164.8 km^2 Acworth/Allatoona, and 122.1 km^2 Stamp/Rowland Rivers, which are all tributaries of the 2,870 km^2 Lake Allatoona drainage area located in northern Georgia, U.S. 
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). The 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.