The minimum allowable depth of cover is the largest of:
For roads H=B/8+0.2(m) H=B/6(m) and not less than 0.6（m）
For railways H=B/4 and not less than 0.6(m)
There is a possibility to reduce depth of cover provided that suitable checking calculations will be made.
Applications
Culverts
Drainage Systems
Stormwater Systems
Fish Passages
Conveyor Covers and Overcasts
Ventilation Systems
Utilidor Systems
Culvert Relines
The minimum allowable depth of cover is the largest of:
For roads H=B/8+0.2(m) H=B/6(m) and not less than 0.6（m）
For railways H=B/4 and not less than 0.6(m)
There is a possibility to reduce depth of cover provided that suitable checking calculations will be made.
| Flexible structure | Plate thickness | Kinds of standard corrosion protection | Required average min value(um） |
| plates | ≧6mm | Hot zinc galvanizing | 85 |
| ≧3mm do < 6mm | Hot zinc galvanizing | 70 | |
| ≧1.5mm do < 3mm | Hot zinc galvanizing | 55 | |
| Bolts and nuts | - | Hot zinc galvanizing | 45 |
Highway Construction 
Mine Projection 
Municipal Engineering 
Irrigation Engineering 
Railway Construction Projection 
Other Application 
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