Loading docks trench drains vary based on expected water flow. Though trench drains for loading docks do not have a standard trench width, size should depend on the water runoff the system can support. Consider installing a 4" pre-sloped polymer concrete trench drain in truck ramps with limited runoff water.
Loading docks with larger trucks and water flow should install a reinforced drain at least 8" across. Install HS20 or HS25 load rated trench drains with Class D or Class E trench grates in loading docks significant tractor trailer and forklift traffic.
Trench forming systems and cast-in-place trench drains are more common in loading docks with higher flow rates due to material costs and flow requirements.
- Surface Area. How much surface area slopes toward the drain? Loading docks with more uncovered surface should consider a high volume trench drain.
- Design Layout. Does the project call for customization? When a loading dock project comes with a complex layout, former trench drains can adapt to intersections, slope and channel shape requirements.
- Trench Grates. You won’t need heel proof grates in a loading dock, but put extra consideration into durability before ordering. Due to heavy traffic in loading docks, always choose a cast iron or ductile iron grate.
Recommendations for Loading Dock Drainage Systems
Polycast 700 Series (by Hubbell)
Small docks with low water flow are should use a 4"-6" trench drain with a built-in slope such as the Polycast 700 Series. This 6" Polycast trench drain has an interior width of 4" and a pre-sloped channel body that makes rapid water evacuation a breeze. With a HDPE or cast iron frame, the 700 Series is durable enough to handle semi-trucks and forklifts without channel break down.
EconoDrain #12 Series (by MultiDrain)
The 12" former system by MultiDrain Systems combines the design flexibility of a frame-and-grate system with the convenience of a modular trench drain. The system's heavy duty cast iron grates and frames reinforce the concrete channel body, creating a durable system perfect for loading dock applications.
R-4990 Frame-and-Grate (by NFCO)
Neenah Foundry's R-4990 Series frame-and-grate lets you fully customize your layout for tricky loading dock projects. The system's heavy duty iron grates are available in several patterns from standard slotted to transverse grates.