Similar to 水害予防組合

Erosion control

Estuary

River delta

Frazil ice

Tributary

Base level

Drainage system (geomorphology)

River source

Water slope

Floodgate

Water right

Hydroelectricity

Rapids

Weir

Antecedent drainage stream

Alluvial fan

Entrenched river

Bed load

Thalweg

Meander