| Abbreviation | Definition |
|---|---|
| FMS | Flood Management Strategy |
| FRL | Full Reservoir Level |
| GAL | Gallon |
| GDF | Gauged Daily Flow |
| GDFD | Gauged Daily Flow Data |
| GHRC | Global Hydrology Resource Center |
| GHT | Green Hydro Treater |
| HADS | Hydrometeorological Automated Data System |
| HEC | Hydrologic Engineering Center |
| HECRAS | Hydrologic Engineering Center - River Analysis System |
| HELP | Hydrology for Environment, Life, and People |
| HESS | Homehydrology And Earth System Sciences |
| HFCP | Hydrogen Fuel Cell Powered |
| HMS | Hydrologic Modeling System |
| HOST | Hydrology of Soil Types |
| HPWG | Hydrology Permafrost Working Group |
| HR | Hydropower Resources |
| HTEP | Hydrology Thematic Exploitation Platform |
| HWD | Horizontal Well Driller |
| HWR | Hydrology and Water Resources |