Provide the maximum wheel load, tire contact area, vehicle type, traffic frequency, and crossing direction. Forklift wheels can impose concentrated loads that differ substantially from pedestrian loading. The design must verify the grate, frame, anchors, and concrete supports together, including any required load classification or testing.

Supply the trench clear width, total run length, available support dimensions, frame depth, finished paving level, and preferred panel lengths. Drawings should identify corners, intersections, outlets, and obstructions. Include the required loads, surface treatment, opening limits, and fixing or lifting arrangements so the assembly can be priced consistently.

Bar spacing affects both water intake area and the size of objects that can pass through. Closer spacing may suit heels, mobility aids, or small wheels, but can retain more debris. Specify clear opening dimensions and orientation separately from bar pitch, then check drainage performance with an allowance for blockage.

Bearing bars normally run across the trench width, with both ends seated on the supporting frame. Cross bars connect and stabilize the bearing bars but do not replace them as the primary spanning members. Fabrication drawings should clearly show the span direction, required bearing length, and support conditions.

Hot-dip galvanizing is commonly specified for outdoor rainwater drainage, but suitability depends on the actual exposure. Acidic or strongly alkaline liquids, some cleaning chemicals, and persistent immersion can affect zinc performance. Provide the liquid composition, temperature, and wetting conditions before selecting the protective system.

Use removable bolts or approved hold-down devices that restrain displacement while permitting controlled panel removal. Locate lifting provisions where maintenance personnel can reach them, and keep panel weights compatible with the planned handling method. After cleaning, check the seating and reinstall all restraints before reopening the area.