Type – III (Sewers for all conditions i.e. Dry, semi immersed or fully immersed) Using PCC 1:2:4, RCC M-25, brick work of innner ring in 1:2 cement sand mortar, outer ring in 1:5 cement sand mortar, total inner plaster 12.5 mm thick using 1:2 cement sand mortar with 1 mm thick neat cement rendring on it, steel reinforcement TMT Fe 500, 3mm thick steel form work , complete in all respects by using mechanical mixer and vibrator 2135 mm i/d P.T. sewer