(1) Sewerage plans shall consist of as many plans, sections and elevations as may be necessary clearly to show full particulars of all intended and existing sewers and sanitary fittings.

(2) The local authority may further require a sewerage plan to depict as many plans, sections and elevations as may be necessary to show full particulars of-

a) all existing and proposed drains; and

b) the proposed arrangements for the discharge of rain-water from the building and its site.

(3) Sewerage plan shall depict-

a) each floor or level in plan and in elevation along the line of the plumbing and sewerage system;

b) the size, depth and position of every private sewer;

c) the size and position of every manhole, means of inspection, rodding-way, gully, trap, soil-water pipe, waste-water pipe and vent pipe;

d) the position of every trap, soil-water fitting and waste-water fitting;

e) the gradient, in figures, of every private sewer or drain and any change in the gradient of any such sewer or drain;

f) the material of which all such sewers, pipes and vents are constructed or are to be constructed;

g) the levels of the ground and the levels of the inverts of all private sewers at the highest points of such private sewers, at all manholes and at all points at which the gradient of such sewers is changed, all such levels giving the height of the points concerned above such datum-level as the local authority may specify;

h) the positions and heights of all chimneys, windows and other openings within a horizontal distance of six meters from the open end of any soil-pipe, waste-pipe or vent-pipe;

i) the positions of connexions and invert-levels at any points specified by the local authority, all levels being shown on the drawings in relation to such datum-level as the local authority may specify

(4) The following abbreviations may be used on sewerage and drainage plans-