Green Amp - 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.