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In order to undertake the treatment of sewers it is necessary to have the temporary
use of men and equipment from the Department of the Borough Engineer and Surveyor,
to whom I am grateful for co-operation.
The amount of work involved is shown below:—
May, 1961 October, 1961
Total number of manholes baited 785 530
Number of poison " takes" 38 36
It is important to keep the rat population in the sewers at as low a level as possible
so as to limit the possibility of surface infestation. When buildings are demolished
prior to new development, rats may escape from a sewer by way of severed drains, and
though every effort is made to have connections sealed off at the time of demolition,
works of excavation may subsequendy open up the drain and leave a possible source
of future surface infestation.
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