Bulkhead problem
Water Coming Through a Seawall or Bulkhead
Seepage, jets or streams through joints and cracks
The short answer
Water moving through a seawall is normal only when it is coming from designed weep holes and running clear. Water that jets through joints or cracks, or that runs cloudy, is transporting backfill out of the soil mass behind the wall. That is an active erosion pathway rather than drainage working as intended.
What this usually indicates
- Open joints between panels or a failed joint seal
- Filter fabric behind the wall has torn or degraded
- Cracks have propagated through the full panel thickness
- Weep holes are clogged, forcing water to find an unintended path
- 1Clear water from a weep hole — drainage working exactly as designed
- 2A crack through the panel becomes an unfiltered route out
- 3Cloudy discharge and a sediment fan below it — backfill leaving the property
What causes it
Joint separation
As panels move, interlocks open. Water takes the easiest path out, and the easiest path becomes easier each cycle as it enlarges.
Filter fabric failure
Fabric is what allows water to leave while soil stays. When it fails, water leaving the backfill becomes water leaving with the backfill.
Through-cracking
A crack that extends through a panel becomes a conduit. These often show up first as damp patches at low tide and progress to visible flow.
Clogged weep holes
Weep holes silt up or get blocked by vegetation and debris. Water that cannot drain where it was meant to will exit somewhere else.
What an assessment looks at
These are the specific questions an inspection is trying to answer for this symptom.
- Whether discharge runs clear or carries sediment
- Whether flow is from weep holes or from joints and cracks
- How flow changes between high and low tide
- Surface evidence of soil loss immediately behind the discharge points
- Condition and spacing of weep holes along the wall
What tends to happen if it is left
Seepage that carries sediment is the mechanism behind most voids and sinkholes on waterfront properties. The pathway widens over time, so the rate of soil loss tends to increase. Finding it while the discharge is still small usually means a far more contained repair.
Frequently asked questions
Should water come out of my seawall at all?
Yes — properly functioning weep holes relieve pressure behind the wall and should discharge after rain and as the tide falls. The distinction that matters is clear water from designed openings versus cloudy water from joints and cracks.
How can I tell if the water is carrying soil?
Look at the discharge in daylight at a falling tide. Cloudy or tinted water, a sediment fan building on the bottom beneath the discharge point, or fine material collecting on the riprap below are all signs that backfill is leaving with the water.
Can seepage be sealed from the water side?
Sealing a visible leak without addressing where the water is coming from often just relocates the discharge to the next weakest point, and can increase pressure behind the wall. Sequencing matters, which is why this is assessed as a drainage and soil problem rather than a patching job.
Next
Services that address this
Seawall erosion repair
Erosion behind a wall is a plumbing problem before it is a structural one. Water found a route out, and it has been taking soil with it.
Learn moreSeawall void filling
Voids behind a seawall are almost always bigger than the hole you can see. The surface is the last thing to go.
Learn moreSoil stabilization
The soil behind a wall is a structural component. When it loses density, both the wall and anything built on top of it lose support.
Learn moreOther symptoms
Seeing more than one of these?
Problems rarely arrive alone — several symptoms together usually point at a single mechanism.
Soil washing out behind the wall
Dips, depressions or disappearing yard along the wall
Learn moreWall leaning or bowing
The wall is tipping waterward or bulging outward
Learn moreCracks in concrete
Cracked panels, cap or returns
Learn moreDeteriorating wood or vinyl
Rot, splitting, brittleness or UV damage
Learn moreNext step
Seeing water coming through the wall?
Send photographs and a short description. You will get help understanding what the symptoms point to and which repair options are realistic.