平へい水すい

noun

calm water; smooth water

Describes water that is still and without waves; often used in literary or descriptive contexts.

• 湖こ面めんは平へい水すいで、鏡かがみのようだった。

  The lake surface was calm water, like a mirror.

noun

usual amount of water

Refers to the normal or expected water level, such as in a river or reservoir; less common than the 'calm water' sense.

• ダムの放ほう流りゅう量りょうは平へい水すいに戻もどった。

  The dam's discharge returned to the usual amount of water.