Every November, Sanur turns into a river if rainwater has nowhere to go. A well-maintained gutter system and proper site drainage keep your villa dry, protect the foundation, and stop the garden from becoming a swamp. Here is what to check, clean, and fix before the rains really pick up.
What Happens When the Rains Hit
The wet season in Bali runs roughly from November through April, but heavy downpours can start as early as October. In Sanur, where many plots sit close to sea level and some older villas were built with minimal waterproofing, even two hours of hard rain can flood a courtyard or seep under a concrete slab.
If your roof sheds water straight onto the ground beside the walls, you will see it: dark damp patches on plaster, white salt rings on tile edges, and a persistent musty smell inside. Left unchecked, standing water softens the soil around footings and eventually cracks them.
- Check whether water flows away from every wall, not just one side.
- Notice if puddles form in the same spot after each storm – that is a drainage failure, not bad luck.
- Watch the area above your septic tank; saturated ground there means your leach field is overwhelmed by surface water, not just greywater.
Gutters and Downpipes
Walk the perimeter of your villa and look at the roof edge. Many older Sanur houses have narrow zinc gutters that rust within a few years, or no guttering at all – just an overhang that drips directly onto the wall below. Newer builds often use PVC half-round channels bolted to the fascia.
A working system has three parts: the horizontal gutter along the eave, the vertical downpipe (usually at corners), and a splash plate or pipe extension that carries water at least 60 cm away from the foundation. If any link is missing or cracked, water runs down the wall and wicks into the masonry.
Concrete things to check right now: pull gently on the gutter to see if brackets are still holding; run a hand along the seam where two gutter sections meet for a hairline gap; follow each downpipe to its outlet and confirm it discharges into a channel drain or a sloped path, not straight onto bare soil next to the wall.
- Rusted zinc gutters in Sanur's salty air can develop pinholes within three to four years – replace them before they leak through the ceiling.
- Make sure downpipes are not blocked by palm fronds or bird nests; a single stuck leaf can back up the whole run during a storm.
- If your villa has a rooftop rainwater tank, verify the first-flush diverter is actually diverting the dirty initial runoff away from the tank inlet.
Send a couple of photos of your gutter line and the area where water pools on WhatsApp, and we will tell you exactly what needs fixing and how long it takes.
Site Drainage
Gutters only solve the problem above ground level. What happens once the water hits the yard matters just as much. In Sanur many plots are essentially flat, so gravity will not do the work for you. You need either a French drain (a perforated pipe laid in gravel beneath a shallow trench) or a series of channel drains that lead to a soakaway pit or the street gutter.
A common setup I see here: a 10-cm concrete channel drain running parallel to the main building, connected at intervals to a buried PVC pipe that empties into a lined pit off to one side. The pit should be at least 1 m deep and filled with washed gravel so water percolates slowly rather than flooding the surrounding soil.
If your plot borders another property, check where their drainage goes. Water crossing the boundary line is a neighbourly issue, but if it pools on your side because of a slope change or a blocked outfall, fixing the source is usually cheaper than building a secondary drain.
- Slope the ground away from every wall by roughly 2 cm per metre – even a small regrade helps enormously.
- Keep PDAM supply pipes and well casings clear of standing rainwater; constant saturation around them invites corrosion and mosquito breeding.
- In old villas with septic tanks, make sure surface runoff does not flow over the tank lid area; extra hydraulic load can push untreated water back up through floor drains.
Cleaning and Maintenance
Sanur's coconut palms, frangipani trees, and bougainvillea drop a surprising amount of debris. A gutter that was clean in September will be half-full of dried leaves and seed pods by November. The rule is simple: clear gutters and downpipes before the first heavy rains each year, then do a quick visual check after any storm longer than two hours.
For a single-storey villa you can handle this yourself with a long-handled scoop, a bucket, and a garden hose to flush the run. Work from one end so debris slides toward the outlet you are holding open. For two-storey buildings or steep tile roofs, use a proper ladder on firm ground and have someone hold the base – do not stand on the roof ridge to reach the gutter.
- Wear gloves; old leaf litter harbours mould spores and, occasionally, small snakes that shelter under wet debris.
- Flush downpipes with a hose from the top; if water does not exit the bottom within seconds, there is a blockage further down that needs a plumber's rod or camera inspection.
- After cleaning, pour a bucket of water into the far end of the gutter and watch where it goes – this confirms the slope and the outlet path in one minute.
When to Call a Professional
You should stop DIY and call a technician when: water is entering through a ceiling or wall crack rather than just running down the exterior; the foundation shows visible cracking or a step difference between floors; your septic area is persistently soggy even in dry weather (that points to a broken leach pipe, not surface drainage); or the gutter system is structurally detached and hanging by a single bracket.
If you smell gas near any plumbing work, see exposed wiring in a wet area, or need to mix chemicals for pool treatment while dealing with chlorine residue, stop what you are doing and call a licensed professional. Do not attempt to repair electrical fittings with wet hands or stand in standing water near an active circuit breaker box.
For most Sanur villa owners the practical move is to send a few photos on WhatsApp before the next storm season. A quick visual assessment lets the technician tell you whether it is a 30-minute clean-out or a half-day regrade job, and quote from those images.
- Take clear photos of the problem spot, the roof edge, and the ground level around the affected wall.
- Note how long after rain the puddle lasts – five minutes versus two hours tells the technician very different things about capacity.
- If the issue involves both the roof structure and the drainage path, one visit can cover both, saving you a second call.
Questions
How often should I clean my gutters in Sanur?
At minimum once a year, just before November rains. If your villa sits under coconut palms or frangipani trees, aim for twice a year – once in September and again in February if the dry spell leaves a thick layer of dried seed pods.
My courtyard floods every time it rains hard. Is that normal?
Not really. A properly sloped plot with a channel drain or French drain should shed a 15-minute downpour without leaving standing water. Persistent flooding usually means the outlet is blocked, the slope runs toward the house instead of away, or the soakaway pit has silted up over the years.
Can I just redirect the downpipe into my septic tank to get rid of the water?
No. Adding large volumes of surface runoff to a leach field overwhelms it, saturates the surrounding soil, and can push untreated greywater back up through your floor drains. Keep rainwater on the surface drainage system where it belongs.
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