Garden drainage problems in Mallorca and how to fix them
Mallorca gets much of its rain in a handful of violent autumn days, so a garden that copes for eleven months can still flood in an hour. The puddle is almost never where the problem is: water arrives at the low point from somewhere else, and fixing the low point without finding the source just moves it.
Key takeaways
- The gota fría storms in September and October deliver more rain in hours than the previous three months together.
- Most flooding starts with a change upslope: a new drive, a repointed wall or a blocked channel.
- Compacted ground behaves like clay even where the soil is thin and stony.
- A soakaway only works where the ground accepts water. On clay it needs storage and a controlled outlet instead.
Where does the water come from?
Stand in the garden during heavy rain, unpleasant as that is, and watch. Nine times out of ten the answer is visible in five minutes: water sheeting off a drive, coming through a boundary, running off a roof with no downpipe connection, or arriving from a neighbouring plot that was resurfaced last year. A short video of that is the single most useful thing you can give a contractor.
Common causes and what suits them
| What is happening | What usually fixes it |
|---|---|
| Water sheets off a drive or terrace | Channel drain and a corrected fall |
| Puddles that sit for days on lawn | Decompaction, then land drains if it persists |
| Water crosses from an upslope plot | Interceptor drain along the boundary |
| Terrace floods towards the house | Regrading and a threshold drain |
| A dry stone wall keeps collapsing | Drainage behind it, since the wall is the symptom |
| A torrent or channel that has silted up | Clearing and reinstating the route |
| Nowhere for the water to go at all | Storage plus a controlled outfall |
Why compaction causes so much of it
Ground that machinery has driven over loses its structure, and water then sits on top of it rather than soaking in. This is why new build plots flood in their first autumn even in areas with free draining limestone underneath, and why the fix is often mechanical rather than a pipe. Opening the ground up does more than a drain in a garden where nothing has ever been dug.
What about the dry stone walls?
A traditional marge holds a slope precisely because water passes through it. Point the joints with cement and it becomes a dam, which is why so many repaired walls fail again a few winters later. If a wall has moved, look at what changed uphill before rebuilding it, or the new wall will go the same way. There is more in dry stone walls and marges.
What you are allowed to do with the water
That depends on the municipality and on what the property was built with. Some plots are expected to absorb their own runoff rather than discharge into the street, which makes storage and a soakaway the answer instead of a pipe. It is worth asking before designing anything, since the rule decides the solution.
How the matching works
We do not do drainage work. Describe what happens when it rains and we pass it to vetted companies on Mallorca covering your area, who quote you directly. Request free quotes and compare how each proposes to deal with the source rather than the puddle.
Why does my Mallorca garden flood if it barely rains here?
Because the rain arrives in a few very intense autumn storms. A garden sized for average rainfall can still be overwhelmed in an hour.
Is a soakaway enough?
Only where the ground actually accepts water. On compacted or clay ground the usual answer is storage with a controlled outlet.
When is the best time to investigate drainage?
While it is raining hard. Photographs or a short video of where water runs during a storm tell a contractor more than any dry site visit.
Can I drain rainwater into the street?
It depends on your municipality and on how the property was built. Some plots are expected to absorb their own runoff, so check before designing a pipe.
Where to start
Next time it pours, take a video from an upstairs window and one at ground level. Send those with the job and the quotes you get back will be about the actual cause.
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