Cargo Port & Marine Drainage

Drainage by Application

Container terminals, wharf aprons, ro-ro ramps, and boatyard hardstands combine the heaviest wheel loads in civil construction with constant salt exposure. The drainage that survives here is specified as a complete system — channel, edge rail, grate, and lock — not bought piece by piece.

Why terminal drainage fails

Port pavements drain enormous flat catchments, so trench runs are long and flows are high. The equipment is the real problem: a laden reach stacker or straddle carrier concentrates far more weight on each wheel than any highway truck, and it brakes and pivots directly over the grate line. Grates that are undersized for the duty crack or rock loose; unsecured grates migrate under dynamic loads and become a strike hazard for tires and personnel. Add salt spray and deicing chemicals, and unprotected steel edges and fasteners corrode years before the pavement wears out. The common failure on wharf aprons is not the channel body — it is a grate or edge rail that was matched to the wrong load class or the wrong exposure.

Load class: start at E, prove F

Under EN 1433 classes, gate lanes and chassis traffic are generally Class D (400 kN) duty; anywhere container handlers, reach stackers, or heavy forklifts operate, treat Class E (600 kN) as the working minimum and specify Class F (900 kN) under the heaviest equipment. Our load class recommendation guide walks through all six classes with typical applications.

Recommended systems

Heaviest duty — aprons, hardstands, equipment runways

ACO PowerDrain S100K / S200K / S300K

Polymer concrete channels with integrally cast ductile iron edge rails, in 4-, 8-, and 12-inch internal widths, with published loading to EN 1433 Class F as a complete system. Numbered channels carry a 0.5% built-in slope; matched ductile iron grates and locking hardware keep the grate line secure under braking and turning equipment. The S300K family handles the high flows of long apron runs.

Corrosive splash zones — wharf edges, wash-down areas

ACO KlassikDrain KS-Series (stainless rail)

The KlassikDrain range pairs non-corroding polymer concrete channels with a stainless-steel edge-rail option (KS100/KS200/KS300) for salt-laden environments where galvanized coatings are consumed quickly. Widths from 4 to 12 inches cover support-building surrounds, fueling points, and wash-down bays; load classification varies by grate and model, so each component is confirmed at quote.

Grate replacement — existing frames, inlets, and castings

Ductile Iron Grates & Foundry Castings

For rehabilitating existing port inlets and trench frames, we supply metal replacement grates plus municipal-grade castings from EJ and U.S. Foundry. Ductile iron carries heavy wheel loads at lower weight than gray iron — send us the frame dimensions and duty and we will match a casting.

Josam trench drainage (Pro Plus polymer concrete) is also available on request for marine and industrial projects — ask when you request your quote.

Planning resources

Load Class Recommendation Guide — EN 1433 classes A–F explained
Sizing for Storms: Estimating Runoff — sizing long apron runs for real storm flows
Runoff Calculator — quick catchment math for paved terminals
Drainage FAQs & Resources — the full resource hub

Cargo port drainage FAQs

What load class does a container terminal trench drain need?

Wherever laden container handlers, reach stackers, or straddle carriers can track over the drain, specify EN 1433 Class E (600 kN) as a working minimum and Class F (900 kN) under the heaviest equipment. Truck-only gate lanes and chassis parking are typically Class D territory. Confirm the channel, grate, and embedment together as a complete system.

How do you deal with salt corrosion on marine drainage grates?

Polymer concrete and fiber-reinforced concrete channel bodies are non-corroding; the metal components are the exposure risk. In splash and spray zones, stainless-steel edge rails (ACO KS-series KlassikDrain) and ductile iron grates with protective coatings are the usual answer. Send us the exposure conditions and we will match materials line by line.

Are these port drainage systems in-stock items or quoted?

The heavy commercial lines (ACO PowerDrain, KlassikDrain, and foundry castings) are quoted by project so channels, grates, outlets, and locking hardware arrive as a matched system. Send a run length, load class, and outlet plan through our quote form and we will price the complete package.