92.40.-t Hydrology and glaciology; cryosphere (see also 92.70.Ha-in Global change)
- 92.40.Aa Anthropogenic effects (see also 92.30.De-in Geophysics Appendix)
- 92.40.Bc Chemistry of fresh water
- 92.40.Cy Modeling; general theory
- 92.40.De Drought
- 92.40.Ea Precipitation (see also 92.60.jf-in Geophysics Appendix); Rivers, runoff, and stream flow, see 92.40.qh and 92.40.qp-in Geophysics Appendix
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92.40.Gc Erosion and sedimentation; sediment transport (see also 91.50.Jc-in marine geology; 91.65.Ti-in Mineralogy and petrology; 91.67.Ty-in Geochemistry; 92.10.Wa and 92.20.Vn-in oceanography; 91.80.Wx-in Geophysics Appendix)
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- 92.40.Ha Debris flow and landslides
- 92.40.Iv Desertification
- 92.40.Je Evapotranspiration (see also 92.60.jc Evaporation-in Geophysics Appendix)
- 92.40.Kf Groundwater
- 92.40.Lg Soil moisture and temperature; Limnology, see 92.40.qj-in Geophysics Appendix
- 92.40.Oj Eco-hydrology; plant ecology
- 92.40.Pb Geomorphology
- 92.40.Qk Surface water, water resources; Water quality, see 92.40.kc and 92.40.qc-in Geophysics Appendix; Snow, see 92.40.ed-in Geophysics Appendix
- 92.40.Vq Glaciology (see also 92.30.Mc-in Geophysics Appendix); Ice, see 92.40.vx-in Geophysics Appendix
- 92.40.We Hydrologic cycles and budgets
- 92.40.Xx Irrigation; dams
- 92.40.Yy Wetlands
- 92.40.Zg Hydrometeorology, hydroclimatology