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54
authority having been obtained, written notice was served on
the occupier of each house, notifying them of the intention of
the Local Authority to examine the drains. In each instance
defective conditions were found and the usual notices were
served to alter and amend the drains and fittings. All such
notices served during the year were complied with.
New drains are required to be constructed of salt glazed
stoneware or heavy cast iron pipes laid on a suitable bed of
concrete, the concrete being extended to at least half-way up
the sides of the pipes. Where a drain passes under a building,
the pipes used are usually of heavy cast iron properly coated,
and laid in concrete to a thickness of six inches, suitable manholes
for access and cleansing purposes being provided. The
drains are disconnected from the public sewer by means of an
intercepting trap fixed in a man-hole. The internal brickwork
of the man-holes are rendered with cement, and made watertight,
iron air-tight frames and covers being provided at the
ground level.
The ventilation of the drainage system is effected by means
of a fresh air inlet fitted with a mica flap valve, connected with
the intercepting chamber, and a 4in. galvanized or heavy cast
iron pipe with molten lead caulked joints is erected at the
summit of the drains.
On completion of each re-drainage scheme, a survey and
final test of the drains and fittings are made by the Inspector,
and a block plan is prepared and filed for future reference.
Such plans, together with other tabulated particulars, form a
complete and valuable record of all alterations and re-drainage
carried out in the district.
Of the houses re-drained during the year, 54 were on the
combined drainage system, viz.: conduits receiving the drainage
of more than one house.
In five instances, such conduits serving 17 houses were
found to be in one ownership, and as the "law'' defines such
conduits to be sewers, the Local Authority were put to the
expense of re-laying them.
Attention has been drawn in previous Annual Reports to
the advisability of the Corporation obtaining a private Act, to