An existing 300 mm diameter circular sewer is laid at a slope of 1 : 280 and carries a peak discharge of 1728 m3/d. Use the partial flow diagram shown in the figure below and assume Manning’s n = 0.015. At the peak discharge, the depth of flow and the velocity are respectively -
1
45 mm & 0.28 m/sec
2
120 mm & 0.5 m/sec
3
150 mm & 0.57 m/sec
4
300 mm & 0.71 m/sec