HEC-SSP Tutorials and Guides Parametric Modeling Current: Task 8. Fit and Compare Multiple Models to the All-Season 3-day Precipitation Time Series PDF Download PDF Download page Task 8. Fit and Compare Multiple Models to the All-Season 3-day Precipitation Time Series. Current page All pages Task 8. Fit and Compare Multiple Models to the All-Season 3-day Precipitation Time Series Do not use a seasonal filter. Instead, simply extract the annual maximum series.Accept a model and estimate quantile information.The GEV | Linear Moments model was chosen and is shown in Figure 1.Continue to Task 9. Compare the Results of the Winter, Spring, and All-Season 3-day Precipitation Models. ×