Sink
Sinkhole
Sinuosity
Siphon
Siphon tube
Siphonage
Site
Skewed
Skimmer gate
SKIP
Skiving
Slab
Slaking
Slate
Sleet
| Slide
Slide gate
slope
Slope protection
slough
Slug
Sluice
Sluice gate
Sluiceway
Sluicing
Slurry
Slurry trench
Small power producer (SPP)
Smolts
snow
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