Emerging Environmental Technologies and Policies deals with five intriguing subjects: Comparison between conventional sewer system by way of gravity sewer collection, pressurized piped sewerage transmission and vacuum piped sewerage transmission; water and circular economy; continuous 24x7 smart water supply projects; comparative study on ZLD and MLD for wastewater management, and irrigation efficiencies for canal-based system and pipeline system. This is a practicing manual for the critical thinkers in the field of environment dealing with water, wastewater, and irrigation. The authors while dealing with such complex topics have balanced the language with lucidity, diagrams, and flow charts to make the subject comprehensible and interesting even for a lay reader.