Type – III (Sewers to remain immersed under high sub soil water) 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 1065 mm i/d P.T. sewer