Seawall / Foreshore Construction SWMS

Seawall and foreshore construction involves placing armour rock, precast concrete units, or cast in-situ concrete walls along tidal interfaces to protect coastal land from erosion and storm surge. The work combines heavy earthmoving plant operating on unstable batters with manual rigging of multi-tonne armour units, all sequenced around tidal windows that compress shift planning and elevate fatigue risk. Because crews work adjacent to or within tidal water, on partially completed structures more than 2 metres above the substrate, and alongside mobile plant in confined foreshore corridors, the work triggers multiple High Risk Construction Work categories under WHS Regulation 2025 r291. A documented Safe Work Method Statement is mandatory before work commences, must be developed in consultation with workers under s47, kept accessible on site, and reviewed whenever tidal conditions, plant configuration, or rock supply sequencing changes. This SWMS provides the controls, sign-on register, and review triggers required to discharge the PCBU's primary duty of care under s19.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Sequence armour placement from landward bench so workers never stand seaward of the active placement face or within the tidal inundation envelope at any stage.
2. 2Elimination — Suspend all foreshore works during forecast significant wave height above 1.0 m or wind above 40 km/h using a documented stop-work trigger card.
3. 3Substitution — Replace manual rock pinning with mechanical orange-peel grab or hydraulic rock grapple to remove hand-guided placement of armour units over 500 kg.
4. 4Substitution — Use precast concrete armour units (Hanbar, Xbloc) with engineered lifting points instead of irregular quarry rock where design permits, eliminating sling slip hazards.
5. 5Engineering — Install ROPS/FOPS-certified amphibious excavators with sealed cabins, marine-grade hydraulics, and load moment indicators set to 75% SWL for over-water reach.
6. 6Engineering — Construct compacted rock-armoured working platform certified by a geotechnical engineer to AS 3798 with documented bearing capacity exceeding plant ground pressure by 1.5×.
7. 7Administrative — Issue tidal window work permits referencing Bureau of Meteorology tide and swell forecasts, with a nominated tide watcher equipped with marine VHF and air horn.
8. 8Administrative — Conduct pre-start brief against this SWMS, confirm exclusion zones (1.5× boom radius), verify dogger/operator radio channel, and capture sign-on before any plant start-up.
9. 9PPE — Issue AS 4758 Level 100 inherently buoyant PFDs to all personnel within 3 m of the water edge, with crotch straps and integrated whistle and strobe.
10. 10PPE — Require AS/NZS 2210.3 marine-grade safety boots with metatarsal guards, AS/NZS 1801 hard hats with chin straps, cut-5 gloves, and AS/NZS 1337 sealed eye protection during concrete works.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a regional council foreshore renewal project, a site supervisor opens this SWMS at the 6:15 am pre-start brief, 90 minutes before the morning low tide window of 07:45. The crew of six — excavator operator, dogger, two rock-placement labourers, surveyor, and tide watcher — gather on the landward bench. The supervisor walks through the seven hazards on the SWMS, pausing on tidal sweep risk because the Bureau forecast shows a 1.2 m residual swell from an overnight low. Referencing the stop-work trigger on control point 2, the team agrees to limit placement to the upper berm only and defer toe-course inspection until the next neap cycle. Exclusion zones are paced out at 12 m (1.5× the 8 m boom radius), the dogger confirms VHF channel 8 with the operator, and Level 100 PFDs are fitted and buddy-checked. Each worker signs the SWMS register. Two hours into the shift, swell builds unexpectedly to 1.4 m; the tide watcher sounds the air horn, the operator parks the excavator on the landward bench, and the crew retreats. The supervisor annotates the SWMS review log, records the trigger event, and reschedules toe works — demonstrating the SWMS functioning as a live field control document, not a filed compliance artefact.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2550 — Cranes, hoists and winches; AS 1418 series

Frequently asked questions