A study was undertaken to determine the predictive capability of the AGNPS model with respect to surfacerunoff, peak flow, and sediment yield produced by rainfall-runoff events on a 26 km2 watershed in Quebec. Precipitation,stream discharge, surface runoff, and suspended sediment concentrations were monitored for rainfall-runoff eventsoccurring from 1994-1996, inclusive. Data describing stream patterns, topography, soil type, and land use were collectedand input to the model. Seven rainfall-runoff events were used for model calibration. Five storms were used to validatethe model. Calibration curves were developed to correlate the antecedent precipitation index (API) to the SCS curvenumber. For model calibration, coefficients of performance of 0.12, 0.05, and 0.43 were obtained for peak flow, surfacerunoff, and sediment yield, respectively. For model validation, coefficients of performance of 0.02, and 0.01 were obtainedfor surface runoff, and sediment yield, respectively. Peak flow was generally overpredicted and yielded a CP'A of 2.07.
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Perrone et al. (1997) studied this question.