SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Hydrologic evaluation of a Mediterranean watershed using the SWAT model with multiple PET estimation methods 
Authors:Licciardello, F., C. G. Rossi, R. Srinivasan, S. M. Zimbone and S. Barbagallo 
Journal:Transactions of the ASABE 
Article ID: 
URL (non-DOI journals):http://ssl.tamu.edu/media/49873/feliciana-etpaper.pdf 
Model:SWAT (modified) 
Broad Application Category:hydrologic only 
Primary Application Category:evapotranspiration assessment 
Secondary Application Category:model comparison 
Watershed Description:1.3 km^2 Canata in the eastern part of the island of Sicily, in southern Italy 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:The Penman‐Monteith (P‐M) method suggested by the Food Agricultural Organization in irrigation and drainage paper 56 (FAO‐56 P‐M) was used in the Soil and Water Assessment Tool's (SWAT) water balance simulation at the outlet of an experimental watershed in Sicily, Italy. A sensitivity analysis determined that the model was more sensitive to this potential evapotranspiration (PET) parameter than to the other six parameters impacting surface runoff in this small Mediterranean watershed. The FAO‐56 P‐M method was compared to the three existing SWAT PET methods from 1997 to 2003. The watershed's water balance was more realistically simulated by the FAO‐56 P‐M method than by the other PET methods. The traditional P‐M method incorporated into SWAT overestimated total (surface and base flow) runoff volumes observed during the entire period by approximately 50%; however, total runoff volumes were underestimated by only 17% when the FAO‐56 P‐M method was used. The surface runoff simulation results using the FAO‐56 P‐M PET equation for calculating daily values was sufficient at the monthly time interval (Nash‐Sutcliffe efficiency >0.75) during the calibration and validation periods. The incorporation of the FAO‐56 P‐M method has broadened the SWAT model's applicability to watersheds that are in semi‐arid environments with high‐intensity, short‐duration rainfall events. 
Keywords:FAO-56 P-M, Potential evapotranspiration, Surface runoff, SWAT, Watershed modeling