Water jetting where the run-off heads for the sea

18 October 2026

Salt is hard on everything near the shore. Steel rusts in layers, paint lifts, concrete spalls where the reinforcement inside has begun to corrode, and the drains in harbour-side yards fill with sand, weed and grit. A lot of the work of putting those things right uses water at very high pressure, which raises an obvious question on the coast: where does all that water go afterwards?

Different jobs, different pressures

Water jetting covers a wide spread of tasks. At the gentler end, a jetting hose clears silt and debris from drains and gullies, often with a jet vac tanker sucking up whatever is loosened. At higher pressures, specialised equipment can remove coatings and corrosion from steelwork or damaged material from concrete ahead of repairs. The condition of the surface and the material that needs to remain determine how that work is approached. The method is chosen for what needs to come off and, just as much, for what must stay.

Keeping the washwater out of the harbour

On an inland factory floor, washwater can be contained and pumped away. Beside the sea it is tempting to let it run off the edge, and that is exactly what must not happen. Water used to strip old coatings can carry paint flakes and metals. Concrete removal can produce slurry containing fine particles. Drain jetting can lift sediment and oily deposits. The water and material released need controlling, with collection and recovery arrangements suited to the job. SEPA regulates activities affecting Scotland's water environment, including discharges to coastal waters. Around a harbour, the direction of drainage and the route taken by water across a yard matter just as much as the surface being cleaned.

That attention to the material removed and the water used runs through the way High Pressure Jetting describes high pressure water jetting for drains, industrial equipment and hard surfaces, with controlled washwater and jet vac tanker work.

Tides, wind and daylight

Coastal jetting keeps its own timetable. Work at the foot of a wall or on a slipway may only be possible for a few hours either side of low water. Wind matters too, because spray from a high pressure lance carries a long way in a stiff breeze, and nobody wants a fine mist of old paint drifting across moored boats or washing hung out to dry. In winter the short days squeeze all of this into a narrow window, and frost brings its own trouble: water left on a surface or in a hose freezes quickly.

For work close to the water, the tide table and forecast belong alongside the site drawings. Recovery equipment needs to be considered before cleaning begins, especially where runoff could reach the harbour. It is the sort of detail that matters in Stonehaven, where working yards, sea walls and moored boats sit close together. A clean surface is only part of the finished job; the material washed off it has to be accounted for as well.