| filename extensions | art-335 |
| hcu | |
| TechTarget file types | art-336 | HCU-HydroCAD-Stormwater-Modeling-System-Units-Definition-File-HydroCAD-Software-Solutions-LLC |
| TechTarget file types | art-336 | HCU-Hydrograph-Units-Definitons-File |
| English | eng-000 | HydroCAD Stormwater Modeling System Units Definition File |
| English | eng-000 | Hydrograph Units Definitons File |