Tai Wai Drain Services

Sing Tao Headline reported on 10 September 2024 that in Sha Tin Tau Village, near Che Kung Temple Station in Tai Wai, manholes in the village footpaths were often choked and backing up; the village head said close to a hundred households were affected and a resident described it happening three or four times a month. The Drainage Services Department told the paper that a public sewerage system has been laid for the village, with sewage reaching the village's gravity system through private terminal manholes. It had received 15 requests or enquiries about choked sewerage facilities at the village that year up to September: 4 concerned facilities inside the village expansion area and were referred on, and of the remaining 11, nine were blockages in private terminal manholes while two were public sewerage facilities its own staff went out to clear. In other words, when a village manhole overflows, clearing it is usually the owner's own arrangement rather than a government call-out.

On 8 June 2026, during this year's first black rainstorm, Sing Tao Headline reported that the Observatory recorded over 100 mm of rain an hour in Sha Tin, and that one of the four flooding reports confirmed by the Drainage Services Department by 9pm that night was at Tsang Tai Uk, beside Pok Hong Estate east of Tai Wai in the same river valley. The Tai Wai Nullah runs through the town centre, and a Legislative Council press release of 24 June 2025 records DSD telling members that the revitalisation works would include improving the channel downstream to reduce the build-up of sediment. Inferring from the local topography, extreme short-duration rain loads the road gullies, the podium drains and the nullah at the same time, and surface flooding usually comes from leaves and silt blocking an inlet. If a toilet indoors is also slow in the same week, the two need not share a cause and should be checked separately.

The Housing Authority's Tenants Purchase Scheme list shows Hin Keng Estate's 8 blocks as Y2, Y3 and Y4 types, occupied from 1986 to 1988, with 5,876 flats offered for sale. As a general inference from building age, stacks in service for close to forty years collect grease and soap scale on their inner walls year after year. Inferring from the design, the flats in each wing of a Y-type block share one stack, so when its lower part narrows, low-floor toilets and floor drains are the first to rise. The Buildings Department's practice note APP-164 requires the sanitary fitments on the floor where a stack discharges to a manhole — and, in a building over 20 storeys, those on the floor above as well — to be given separate pipework discharging directly to a manhole. It covers only drainage plans submitted to the Building Authority for approval after 31 August 2021 and works commenced under the Minor Works Control System after that date, so 1980s designs do not have that arrangement. Since one block can hold both owners and tenants, say which you are when you report a fault.

Festival City has been handing over flats since 2011 and The Pavilia Farm since its first two phases were completed in 2022 and 2023. As a general inference from building age, the pipes in these flats are still new, and the usual trouble is what renovation leaves behind. The Buildings Department's drainage guideline treats a serious blockage by material such as cement separately from an ordinary one: a minor blockage can usually be cleared by a high-pressure water jet or by rodding, while a length set solid with cement may have to be opened up and replaced. Sealing every outlet during the fit-out is therefore far more practical than putting it right afterwards. The other thing to watch is that a new flat usually stands empty between completion and the day someone moves in, so the water seals in its floor-drain traps evaporate. Running water into every outlet before you move in, watching how fast it drains and whether it smells, costs far less than finding the fault after the fit-out. Altering a trap or an anti-syphonage pipe is minor works and needs a registered contractor.

Restaurants cluster in Tai Wai, and the stretch along Chik Chuen Street has long been known as the Tai Wai food street. The Environmental Protection Department advises checking a grease trap at least every three days, cleaning it as soon as grease builds up beyond three tenths of the liquid in the trap, and keeping a written record of each cleaning; it also states plainly that grease-trap waste must not be dumped into a toilet, a rainwater inlet, a nullah or a manhole. Inferring from how densely the restaurants sit here, a stale-oil smell in the flats above, or white congealed grease at a back-lane gully, usually points to a nearby kitchen's waste pipe or trap rather than to a trap in your own flat. For the restaurants themselves, the early warning is a sink branch pipe and a floor drain slowing down together.