https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092521#M267275 <P><EM>you have to use intensity.. NOAA 14 gives both volume and intensity</EM></P> Wed, 15 Apr 2026 22:58:11 GMT fcernst 2026-04-15T22:58:11Z https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092321#M267268 <P>Is it possible to add in Atlas 14 rainfall data into SSA and use the rational method? Everything I am seeing says the only way to not use IDF curves is to use SCS method. The city is requesting Atlas 14 rainfall data and rational method and I can't figure it out. I am using SSA with C3D 2025</P> Wed, 15 Apr 2026 19:56:38 GMT https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092321#M267268 lindyWBGWY 2026-04-15T19:56:38Z https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092521#M267275 <P><EM>you have to use intensity.. NOAA 14 gives both volume and intensity</EM></P> Wed, 15 Apr 2026 22:58:11 GMT https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092521#M267275 fcernst 2026-04-15T22:58:11Z https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092637#M267279 <P>How do you even get to the window to add it in?</P> Thu, 16 Apr 2026 01:58:44 GMT https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092637#M267279 lindyWBGWY 2026-04-16T01:58:44Z https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092659#M267282 <P>Read the help for creating IDF files in civil 3D. You can create it in Hydraflow and then use the IDF file in both Hydraflow and analyze gravity network</P> Thu, 16 Apr 2026 02:34:21 GMT https://forums.autodesk.com/t5/civil-3d-forum/adding-atlas-14-rainfall-data-into-ssa/m-p/14092659#M267282 fcernst 2026-04-16T02:34:21Z