HEC-SSP Tutorials and Guides Parametric Modeling Current: Task 7. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series PDF Download PDF Download page Task 7. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series. Current page All pages Task 7. Fit and Compare Multiple Models to the Spring Season 3-day Precipitation Time Series Use a season spanning 01Apr through 15Jul to filter the data.Accept a model and estimate quantile information.The GEV | Linear Moments model was chosen and is shown in Figure 1.Continue to Task 8. Fit and Compare Multiple Models to the All-Season 3-day Precipitation Time Series. ×