Map how rainwater moves from roofs, balconies, yards, roads and common areas to drains, pumps and discharge points. Remove debris, test pumps and alarms, document standing water or backflow, and coordinate private maintenance with the responsible building, community or local authority.
Which components should be inspected?
- gutters and downpipes;
- balcony and yard drains;
- channels and catch basins;
- pumps, alarms and backup power;
- outfalls and public connections.
Which warning signs matter?
- slow drainage;
- standing water;
- odour or backflow;
- erosion and settlement;
- repeated pump operation.
What records should be kept?
Keep inspection dates, photographs, cleaning and service invoices, pump tests, incident reports and any communication with management or authorities.
Read drainage maintenance alongside the wider monsoon-season guide, the flood-risk property checklist for site-level exposure, and the water-leak response checklist for what to do once water has already entered a unit.
Continue through Owners, Areas and the directory.
Inspect before the rainy season.
Test pumps and clear the complete drainage route, not only the nearest drain.
Find property maintenance supportFrequently asked questions
How often should drains be checked?
Use a schedule suited to the property, rainfall, trees, debris and prior incidents, with extra checks before and during the rainy season.
Should pumps be tested?
Yes. Test installed pumps, alarms, backup power and discharge routes and keep service records.
Does a clear drain eliminate flood risk?
No. Site elevation, public drainage, runoff and regional conditions also matter.
Sources & References
- Department of Disaster Prevention and Mitigation
- Department of Public Works and Town & Country Planning
- Bangkok Metropolitan Administration
- Royal Thai Government Gazette
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.