🚢🔒💧

#canal lock #ship lock #navigation lock #waterway gate #water level control

✅💧↔️💧

#canal lock #water level control #canal system #waterway engineering #managing canals

🌊🧱📉

#water level control #weir #flow regulation #dam #hydraulic structure #head difference

🧱↕️🌊

#raised embankment #flood wall height #water level control #dike structure #barrier height