Top diameter
Minimum 60 cm (24”) clear.
Bottom diameter
As per the depth of the sewer line from ground level.
Minimum 1.20 m [for 1.5 m (5’) depth].
Location
As per the drawing on the proposed main sewer alignment.
Construction of wall
Up to 1.8 m depth = 38 cm to 23 cm.
More than 1.8 m depth = Minimum thickness 45 cm.
Provide C.I. steps at the required height as per the drawings.
Gully/channel
Concrete of grade M10 should be laid in slope as 1:4 and finish smooth with extra cement.
Frame and Cover
Precast heavy duty frame and cover.
Frame to be fixed in 15 cm (6”) thick concrete of grade M10, before internal and external plaster.
Details of Round Chamber.
Plaster
Internal plaster in C.M. 1:4 finished smooth with extra cement.
External plaster in C.M. 1:4 rough finished for bottom half depth and trowel finished for the remaining depth.
Bottom level
Sloped as per the sewer line.
15 mm (1”/2) below the incoming sewer flow.
Flushed with outgoing sewer flow.
Top level
Same as the road level on roads.
