| Brook | Brook-Corey water retention model |
| Campbel | Campbell water retention model |
| Dstart | Determine starting values for nonlinear parameter estimation in the water retention models |
| Expo | Exponential water retention model |
| infilt | Water infiltration characteristics data |
| isric | Water Retention World Dataset from ISRIC |
| MB | McKee and Bumb water retention model |
| Ruso | A Russo water retention model |
| SSfredlund | A Fredlund-Xing water retention model |
| SSgampt | A Green-Ampt water infiltration model |
| SSgard | 'Gardner' Water Retention Model for Grouped Data |
| SSgardner | A Gardner water retention model |
| SShorton | A Horton water infiltration model |
| SSkosugi | A Kosugi water retention model |
| SSomuto | 'Omuto' Water Retention Model |
| SSphilip | A Philip's water infiltration model |
| SSvgm | A five-parameter van Genuchten water retention model |
| SSvgm4 | A four-parameter van Genuchten water retention model |
| Tani | A Tani water retention model |