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from which tunnels were excavated to locations under the floors
A lady, appalled by the primitive standards of hygiene in 1879, wrote ".....no sort of effective drains or sewers have been provided whatever; sewerage finds its way [into rain-water conduits] is simply deposited along the whole harbour front, thus poisoning what else might be a pleasant situation........the arrangements for the daily (or among the poorer classes only bi-weekly!) removal of nuisances from every house (for subsequent conveyance to the mainland as an article of agricultural commerce) form a very unpleasant page in the sanitary statistics........". Environmental concern clearly was not created in the late 20th century.
Matters were not improved by Governor Hennessy (1877-82)'s deep conviction that for the local inhabitants their traditional earth system of sanitation was preferable to western flushing toilets. Even at the eve of the Japanese invasion of Hong Kong in 1941, the primitive system of collection and disposal of sewage was common, collection being based on an estimate of six taels (227 grammes) per person per day. In view of the above it is not surprising that a report recommended in 1882, amongst other things, that the city should be completely re-drained and a cholera outbreak in the following year gave timely impetus for new main drains and sewers to be laid. Nevertheless it was not until soon after the first serious outbreak of plague in 1894 that the main drainage system in the principal urban area had been practically completed. Legislation was then passed in 1896 making drainage for houses compulsory. Records indicate that the main storm-water drains around the turn of the century were formed with mass gravity retaining walls and incorporated a half-round dry-weather flow channel; where appropriate these drains were covered with simply-supported concrete or granite slabs.
Subsequently more open nullahs were constructed, often running along the centre-lines of road reserves, for instance in Kowloon along Nam Cheong Street (Sham Shui Po) which was completed in 1912 and Waterloo Road (both of these now having been decked, mainly to effect much needed road improvements). As a result of continuing enhancements to the drainage system, in particular those relating to nullah and stream training works, plague was virtually eliminated by 1924 whilst deaths from malaria, although still numerous at the outbreak of the Pacific war, gradually declined.