Dam Failure Consequences Analysis
1) Crea un nuovo progetto su HEC-LifeSim (Apri il programma, sulla ribbon bar: File > Create New...)
Initial and Constant Loss Method
Fill this spreadsheet.
Curve Number Calculation
First, you need to download the Annual NLCD (National Land Cover Database). You can download it from LINK.You can download as well the HSG (Hydrologic Soil Group) shapefile from LINK.
Green and Ampt - Loss Parameters Calculation
1. Download the SSURGO Bulk Downoader Tool for ArcGIS Pro or QGIS. Follow this tutorial.
Unit Hydrograph Derivation
Download the discharge data from a national water flow data hub (read this tutorial).
Dam Breach Analysis
In order to obtain the shapefiles together with a PDF report) of all the soil data of your watershed, you can go to Web Soil Survey.