Codes, Standards, Safety and Environmental Protection
This domain tests whether you can name the governing document, apply the correct limit value, and design mitigation that is measurable rather than aspirational.
Standards framework
- BS 6349 covers maritime works: planning, quay walls and jetties, breakwaters, and dredging; PIANC publishes the guidance widely adopted for channel widths, berth geometry and fenders.
- Structural concrete and steel follow national building codes, with marine load cases adding wave, current, berthing and mooring actions to dead and live load; durability exposure classes are more severe than onshore.
- Navigation safety: COLREG for traffic rules, SOLAS and IALA buoyage for aids to navigation; approach channels are marked with lateral marks, safe-water marks and leading lights.
- Environment: MARPOL for ship-source pollution, the London Convention/Protocol for dredged material disposal, and national EIA legislation for port expansion.
Safety and environment in design
- Design against overtopping and wave attack with access restrictions and physical barriers; an overtopping limit around 1 l/s/m is often quoted for personnel access.
- Dredging mitigation: silt curtains, seasonal windows for fish migration and spawning, turbidity limits at a defined compliance point, and contaminant testing before any disposal decision.
- Air and noise: shore power, dust suppression at bulk terminals, and boundary noise limits.
- Emergency response: oil spill contingency, firefighting access and escape routes from the quay.
Worked example
A capital dredge of 1.2 million m³ of contaminated silt near a seagrass bed. The defensible chain is: (1) test for contaminants against disposal criteria; (2) if clean, consider beneficial use; (3) if contaminated, confined disposal with leachate control; (4) set a turbidity limit at a compliance boundary, use silt curtains only where currents are below about 0.5 m/s, and impose a dredging window outside the spawning season; (5) monitor before, during and after with a defined trigger to stop work. Naming a number without its standard and averaging period earns little.
Traps
- Quoting an overtopping or turbidity limit without its source standard and averaging period.
- Assuming an EIA approved once covers later increases in dredge volume or a changed disposal site.