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8
the other hand, are retarded by the admission of
fresh air, by the existence of a low temperature, by
the addition of water, and by the movements
resulting from rapid transit.
The Committee is of opinion that the removal of sewage
beyond the confines of the Parish before decomposition is to any
large extent established, and therefore before it is in a condition
to cause nuisance, is within the scope of a properly directed
effort, provided that
(а) Means be provided for the better cleansing of sewers, so
as to secure the removal of all residual matter,
including debris and incrustation.
(б) Means be provided for securing a plentiful supply of
fresh air to all parts of the sewer.
In regard to the cleansing of the sewers the Committee is of
opinion that a system of flashing should be adopted either by
the construction of tanks at the terminals that should be subject
to automatic discharge, or by hose. That in new sewers the
question of their maintenance in a cleanly condition, free from
deposit and incrustation, should especially be taken into
consideration at the time of their construction. And it
recommends the provision of inspection chambers at suitable
places, and the provision of flushing tanks ; it also recommends,
having in view the necessity for a plentiful supply of fresh air in
the sewers, the provision of ventilation gratings in the roadway
placed at short intervals apart, and shafts placed in such positions
as may be found expedient, and when permission be obtained
from the owners of property.
The Committee further recommend that before its proposals be
put into general practice, an experiment be made upon a section
of the system confined to one tributary of the main sewer. That
this section should be intercepted from the main sewer during
the course of the experiments, in order that the results of the
experiments be not affected by gases evolved in other parts of
the sewer system, and that upon this section the Surveyor be
empowered to carry out the recommendations of this report.