The performance comparison is aimed at establishing whether modifications incorporated in the new version improve model performance, particularly at the field scale level. Specifically, the study assesses the performance of the latest revamped version of the SWAT model, SWAT+ described in vis a vis the widely used old version of SWAT in simulating water yield, soil, and phosphorous loss from a field plot. Globally, 94% of farmlands are smaller than 5 ha. This study compares the performance of hydrological models at even a smaller spatial scale, in a 0.066 km 2 (6.6 ha) micro watershed which realistically represents the size of farmlands in the agricultural sector. A comparison of the Water Erosion Prediction Project (WEPP) model and the Soil Water Assessment Tool (SWAT) in for modeling soil erosion in a small watershed (1.62 km 2) showed that the performance of models can, indeed be different in micro watersheds. Most comparison studies have been undertaken on relatively larger spatial scales. A review of past studies shows that there is limited research on the performance and application of commonly used models at the field scale level, despite land use and planning activities being undertaken on small-sized areas such as on farm plots. However, they differ in terms of complexity, requirements, underlying equations, and assumptions and, as such, their performance in simulating hydrological processes varies. Many models exist for the consideration of these assessments. Models are also integral to watershed management planning processes and are often used to estimate load reductions due to the implementation of water source protection measures. Hydrological models are widely used in the understanding and management of both surface and below-surface water flow processes, water-induced soil erosion, and pollutant transport processes. Undergoing rigorous automatic calibration. Matches the performance of both APEX and SWAT, despite the latter two SWAT+ will be helpful in the understanding of hydrologicalĪnd water quality processes at micro watersheds considering that it addresses structuralįlaws associated with the older version, and the manually calibrated version Performance assessment metric was determined to be overly sensitive and prone Simulated water yield with indices close to optimal values. Satisfactory albeit with low-performance metrics. Uncalibrated SWAT and SWAT+ models simulated water yield Showed that all the uncalibrated models over-predict soil and phosphorous loss Yield, soil, and mineral phosphorous loss from the micro watershed. USDA-Agricultural Research Station near Riesel, Texas, and to predict water Simulate the edge of field processes for a 6.6 ha plot located at the Performance, particularly for small watersheds. New restructured version of SWAT (SWAT+) is compared with the older version toĭetermine whether the new changes incorporated in SWAT+ have improved model Model APEX to assess the performance of both models at a field scale level. In this study, the performance of theīasin-wide older version of SWAT is compared with that of the small watershed Consequently, a key question that has toīe addressed is to select the most suitable model that gives results closest to Underlying equations, and assumptions, and as such their performance in However, these models differ in terms of their complexity, requirements, Response of environmental processes to human activities and climatic change. Hydrologic and water quality models are often used in assessing the
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