Sluiceway
Sluicing
Slurry
Slurry trench
Small power producer (SPP)
Smolts
snow
Social value (psychological value)
Sodic soil
Sodicity
Soil
Soil cement
Soil-cement bedding
Soil classification
Soil conservation
| Soil moisture
Soil subsidence
Solid head buttress dam
Spacing
Spalling (spall)
Spatial concentration
Spawn
Spawning beds
Special examination
Special features
Special populations
Species
Specific gravity
Specific weight
Spectrum intensity
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