🦋↔️🌊

#butterfly valve #disc movement #pivot valve #valve mechanism #water flow control #pipeline flow

🧱🌊⬇️

#spillway #water release #dam outlet #floodgate #water flow control

🌊🎛️│

#water flow control #liquid valve #pipe control #flow regulation #hydraulic valve #control knob

🇪🇬💧🌱〰️➡️

#egypt irrigation canals #nile agriculture #ancient farming #water flow control #historical engineering #water channels