🚱➡️🚇

#wastewater #non-potable water #sewer pipe #tunnel system #drainage flow #effluent transport #water management

💩💧⬇️

#sewage #wastewater #drain #sewer pipe #waste flow #poop water

🚇💩🌊

#sewer pipe #tunnel #waste #sewage #wastewater #underground passage #effluent