- 100-year-flood
- Aggrade
- aquifer
- Basin
- Bed load
- Channelization
- cryptorheic basins
- Culvert
- Distributary
- drainage basin
- drawdown
- Ecosystem
- effluent
- erosion
- estuary
- flood
- flood plain
- flood stage
- Floodplain
- floodway
- greywater
- Groin
- groundwater
- Gullying
- impermeable
- infiltration
- infiltration
- injection well
- leaching
- Loko Iʻa
- marsh
- Mass wasting
- Mitigation
- Nutrient enrichment
- outfall
- pathogen
- percolation
- permeability
- point-source pollution
- porosity
- precipitation
- recharge
- Reclamation
- Reference site
- Rehabilitation
- Remote sensing
- Restoration
- Riparian
- runoff
- sediment
- septic tank
- sewage treatment plant
- sewer
- Sheetwash
- spring
- storm sewer
- stream
- streamflow
- surface water
- Suspended load
- suspended sediment
- suspended solids
- suspended-sediment concentration
- suspended-sediment discharge
- tributary
- turbidity
- Ungulate
- unsaturated zone
- wastewater
- water table
- water table
- watershed
- Weir
- well
- withdrawal
- xeriscaping