Drainage Knowledge Hub

Find guidance by problem and setting: household blockages, odour, commercial maintenance, pipe inspection and rain-related backflow.

Rain, backflow and manholes

Prepare for heavy rain, distinguish stormwater and foul drainage, and investigate backflow and pumping problems.

Desilting Drain Unblocking

Showing 1–12 of 12 articles · Page 1 of 1

2026-09-25

Inspection Chamber Blockage and Overflow: Safe Action and Desilting

A blocked chamber can affect several drains and properties. Keep people clear, establish the drainage responsibility and arrange suitable clearing or desilting.

2026-09-25

Sewage Backflow After Heavy Rain: Immediate Action, Cleaning and Prevention

Stop water use, avoid sewage, record the incident and identify the drainage source before cleaning and disinfection after a rainstorm.

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2026-09-25

Pre-Rainy-Season Drain Checklist for Homes, Shops and Industrial Buildings

Check chambers, roofs, balconies, floor drains and grease traps before heavy rain. Learn when cleaning, desilting or drainage investigation is needed.

2026-09-25

Village House Septic Tanks and Blocked Drains: A New Territories Guide

Distinguish indoor branches, chambers and septic tanks from soakaway or downstream drainage problems before arranging work.

2026-09-25

Yuen Long Village House Septic Tanks and Outdoor Drains: High Water, Backflow and Odours

Distinguish indoor blockages, inspection chamber levels, septic tank capacity and downstream drainage before choosing work for a Yuen Long village house.

2026-09-25

Blocked Balcony Drains in Heavy Rain: Leaves, Sediment and Backflow

Safe checks for balcony and utility-platform ponding, washing-machine drainage, shared rainwater pipes and cleaning after rain.

2026-09-25

Blocked Rooftop Drains Before Heavy Rain: Inspection, Sediment and Shared Pipes

Check rooftop outlets, rainwater pipes and downstream drainage, manage recurring ponding and coordinate repairs safely before storms.

2026-09-25

Blocked Car Park Drains: Flooding, Sludge and Shared Drainage Checks

A management guide to car park drain blockages, safe isolation, sediment removal, downstream investigation and rainy-season maintenance.

2026-09-25

Sewage Backflow Check Valves in Hong Kong: Suitability, Limits and Maintenance

Understand when a backwater valve may help, why it cannot replace source investigation, and what to check before installation and during maintenance.

2026-09-25

Sewage Backflow in Lower-Floor Public Housing: Immediate Steps and Management Coordination

What residents should do when sewage enters a lower-floor flat, how to document the source, involve estate management and plan cleaning after control.

2026-09-24

Stormwater or Foul Drain? How to Check an Outdoor Outlet in Hong Kong

An outdoor drain is not automatically a wastewater disposal point. Learn how to check drawings, trace the purpose of outlets and respond to suspected misconnections.

2026-09-24

Sump Pump Not Working: Safe Checks for Hong Kong Building Managers

Rising sump water needs an immediate safety response. Record alarms, pump sounds and water-level changes, then coordinate pump, electrical and drainage specialists.