TDS Load Chart

Trench Drain Systems


Load class ratings for entire systems will always be determined by the lowest class within the system. For example, if the channel is rated as a C and the grate is rated as a D, the overall system will be rated as load class C. The same is true should the channel be rated as load class C and the grates are rated as load class A; the system as a whole would be rated as load class A. Keep in mind that systems with higher Load Class ratings can be used if you do not find the options you require in the lighter Load Classes.


Load Class A

3,372 lbs per foot (15 kN)

Light Traffic, Residential Use, Gardens, Patios, Landscapes, Pedestrian Areas, Bicycles, Carts, Pools

Shop Class A SystemsShop Class A Grates

Load Class B

28,100 lbs per foot (125 kN)

Domestic Cars and Light Trucks, Small Planes, Light Traffic Parking Lots, Driveways, Sidewalks, Parks and Recreation

Shop Class B SystemsShop Class B Grates

Load Class C

56,200 lbs per foot (250 kN)

Forklifts/Pneumatic Tires, Medium Sized Vehicles, Commercial Parking Lots

Shop Class C SystemsShop Class C Grates

Load Class D

89,920 lbs per foot (400 kN)

Commercial Airliners, Parking Lots, Warehouses, Main Roads

Shop Class D SystemsShop Class D Grates

Load Class E

134,800 lbs per foot (600 kN)

Industrial Areas, Construction Equipment/Vehicles, Loading Docks, Heavy Aircraft, Airports, Cargo Handling Yards

Shop Class E SystemsShop Class E Grates

Load Class F

202,320 lbs per foot (900 kN)

Highway Traffic, Roads, Airports, Terminals, Docks, Extreme Weight Conditions

Shop Class F SystemsShop Class F Grates