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70
at the time drains are constructed, but experience proves that
there is a tendency for Portland cement to expand after the
work has been completed and finally tested. It would appear
that we have no legal authority to test cement intended to be
used for sanitary work, and even if the necessary power could
be exercised I very much doubt if it would be practicable to
suspend work in connection with occupied houses for a period
sufficient to carry out satisfactory tests. It will therefore be
apparent that the unreliability of Portland cement as a jointing
material for stoneware pipes is a very serious matter, both in
the interests of Public Health, and as regards financial considerations
to those who have to maintain drains in a sound
condition. As stoneware drains cannot be relied upon to remain
permanently water-tight I have for some years recommended
the use of cast-iron coated pipes, and that this material
is becoming increasingly popular is evidenced by the fact that
iron pipes were used in several instances during the past year
on the initiative of owners themselves.
COMBINED DRAINAGE.
Of the 95 houses redrained during the year 66 were provided
for by means of 14 combined systems of drainage. Eight
of the main drains, receiving the drainage of some 30 houses,
constituted " sewers " within the meaning of the Public Health
Acts, and these were reconstructed by the Council at a total
cost of £197 1s. 9d. The whole of this work was carried out
by contract in accordance with plans and specifications
which were prepared by your Inspector.
The relaying of the main drain of 20 houses, for which
your Council was also responsible, was in progress at the end
of the year, the amount of the tender for the work being £70.
Six other combined drains, receiving the drainage of 36
houses, were relaid by the respective owners at their own expense,
they being liable for the necessary work.