SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Using a hierarchical approach to calibrate SWAT and predict the semi-arid hydrologic regime of northeastern Brazil 
Authors:Santos, C.A.S., C. Almeida, T.B. Ramos, F.A. Tocha, R. Oliveira and R. Neves 
Article ID:1137 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:calibration, sensitivity, and/or uncertainty analysis 
Secondary Application Category:hydrologic assessment 
Watershed Description:55,317 km^2 Paraguaçu river, located in the east central part of the state of Bahia in northeast Brazil. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:The Paraguaçu watershed in northeastern Brazil faces increasing water scarcity, with water resources unable to meet the increasing demand. Accurate assessment of water availability is thus essential for efficient planning and management of local resources. In this work, the potential of the SWAT model for predicting daily and monthly variability of the hydrologic regime of the Paraguaçu River was assessed. Model calibration/validation followed: (i) A hierarchical framework; (ii) the assessment of maximum, average and minimum streamflow based on paired t-test and linear regression analysis; and (iii) the definition of permanence curves for streamflow with a probability of occurrence of 90% (Q90) and 95% (Q95). The goodness-of-fit indicators revealed a “satisfactory” model performance (model efficiency ranged from 0.42 to 0.83) when predicting streamflow in monitored sub-basins using a unique set of parameters for wet and dry conditions. The flow duration curves also showed that the model underestimated higher flows resulting from extreme events but performed well for flows with exceedance probabilities of <90%. The regression analysis and paired t-test demonstrated that the SWAT model can be used for estimating maximum, average and minimum monthly streamflow in a region where information is insufficient to support water authorities in the decision-making process. The SWAT model can thus be considered adequate for simulating monthly streamflow in the Paraguaçu watershed. 
Keywords:hydrologic process; semiarid; Paraguaçu watershed; hierarchical scheme; SWAT